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Regenerative Radio Workshop
by DC 2017036 Ultron
aboutme
bull Born in Kaohsiung 1994
bull FHCRC102nd
bull Studying EE FJU
bull Joined ArduinoTaipei ( since 2013 )
bull
bull
bull Maker
My Blog httpdavidchensbaseblogspottw
Radio Spectrum
bull IARU CTARL ARRL
bull ITU NCC FCC
bull LF MF HF VHF UHF SHF EHF [wiki]
bull Spectrum Analyzer FFT Superheterodyne
bull Cycle per second ( cps ) Hertz ( Hz ) [wiki]
bull 80 meters 40 meters Speed of light [link]
Image via GWInstek
via Flickr
via NCC
Software Defined Radio ( SDR )
Shortwave Radio Antenna Voice of America Delano Transmitting Station ( via wiki )
A collection of early quartz crystal frequency standard units used in crystal oscillators produced by Bell LabsATampTVectron International ( via wiki )
A pair of 1968 Heathkit vibrators ( via wiki )
Architectures of Radio Receivers
bull Crystal Radio ( )
bull Tuned radio frequency ( TRF ) ndash
bull Reflex receiver ndash
bull Homodyne ( Direct-Conversion ) ndash
bull ( Super ) regenerative ndash ( )
bull Autodyne ndash
bull ( Super ) heterodyne ndash ( )
bull ( heterodyne regenerative autodyne ) detection
bull
Image A drawing of an early vacuum tube radio receiver and horn loudspeaker from an advertisement in a radio magazine around 1922 ( via wiki )
Crystal Radio
bull Crystal Radio ( )
bull Cats whisker detector ( Galena )
bull Germanium transistors
bull Crystal earpiece
bull Needs well grounding
bull Variable LC
bull Easy to make
bull Sensitivity Poor
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Poor
Image Sketch of crystal radio set ( via wiki )
Block diagram of a crystal radio receiver ( via wiki )
A circuit of an inductively-coupled crystal radio receiver with impedance matching ( via wiki )
Crystal radio diagram in 1922 This circuit did not use a tuning capacitor but used the capacitance of the antenna to form the tuned circuit with the coil ( via wiki )
Ernst Jahnke crystal radio receiver ca 1924-1926 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
aboutme
bull Born in Kaohsiung 1994
bull FHCRC102nd
bull Studying EE FJU
bull Joined ArduinoTaipei ( since 2013 )
bull
bull
bull Maker
My Blog httpdavidchensbaseblogspottw
Radio Spectrum
bull IARU CTARL ARRL
bull ITU NCC FCC
bull LF MF HF VHF UHF SHF EHF [wiki]
bull Spectrum Analyzer FFT Superheterodyne
bull Cycle per second ( cps ) Hertz ( Hz ) [wiki]
bull 80 meters 40 meters Speed of light [link]
Image via GWInstek
via Flickr
via NCC
Software Defined Radio ( SDR )
Shortwave Radio Antenna Voice of America Delano Transmitting Station ( via wiki )
A collection of early quartz crystal frequency standard units used in crystal oscillators produced by Bell LabsATampTVectron International ( via wiki )
A pair of 1968 Heathkit vibrators ( via wiki )
Architectures of Radio Receivers
bull Crystal Radio ( )
bull Tuned radio frequency ( TRF ) ndash
bull Reflex receiver ndash
bull Homodyne ( Direct-Conversion ) ndash
bull ( Super ) regenerative ndash ( )
bull Autodyne ndash
bull ( Super ) heterodyne ndash ( )
bull ( heterodyne regenerative autodyne ) detection
bull
Image A drawing of an early vacuum tube radio receiver and horn loudspeaker from an advertisement in a radio magazine around 1922 ( via wiki )
Crystal Radio
bull Crystal Radio ( )
bull Cats whisker detector ( Galena )
bull Germanium transistors
bull Crystal earpiece
bull Needs well grounding
bull Variable LC
bull Easy to make
bull Sensitivity Poor
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Poor
Image Sketch of crystal radio set ( via wiki )
Block diagram of a crystal radio receiver ( via wiki )
A circuit of an inductively-coupled crystal radio receiver with impedance matching ( via wiki )
Crystal radio diagram in 1922 This circuit did not use a tuning capacitor but used the capacitance of the antenna to form the tuned circuit with the coil ( via wiki )
Ernst Jahnke crystal radio receiver ca 1924-1926 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Radio Spectrum
bull IARU CTARL ARRL
bull ITU NCC FCC
bull LF MF HF VHF UHF SHF EHF [wiki]
bull Spectrum Analyzer FFT Superheterodyne
bull Cycle per second ( cps ) Hertz ( Hz ) [wiki]
bull 80 meters 40 meters Speed of light [link]
Image via GWInstek
via Flickr
via NCC
Software Defined Radio ( SDR )
Shortwave Radio Antenna Voice of America Delano Transmitting Station ( via wiki )
A collection of early quartz crystal frequency standard units used in crystal oscillators produced by Bell LabsATampTVectron International ( via wiki )
A pair of 1968 Heathkit vibrators ( via wiki )
Architectures of Radio Receivers
bull Crystal Radio ( )
bull Tuned radio frequency ( TRF ) ndash
bull Reflex receiver ndash
bull Homodyne ( Direct-Conversion ) ndash
bull ( Super ) regenerative ndash ( )
bull Autodyne ndash
bull ( Super ) heterodyne ndash ( )
bull ( heterodyne regenerative autodyne ) detection
bull
Image A drawing of an early vacuum tube radio receiver and horn loudspeaker from an advertisement in a radio magazine around 1922 ( via wiki )
Crystal Radio
bull Crystal Radio ( )
bull Cats whisker detector ( Galena )
bull Germanium transistors
bull Crystal earpiece
bull Needs well grounding
bull Variable LC
bull Easy to make
bull Sensitivity Poor
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Poor
Image Sketch of crystal radio set ( via wiki )
Block diagram of a crystal radio receiver ( via wiki )
A circuit of an inductively-coupled crystal radio receiver with impedance matching ( via wiki )
Crystal radio diagram in 1922 This circuit did not use a tuning capacitor but used the capacitance of the antenna to form the tuned circuit with the coil ( via wiki )
Ernst Jahnke crystal radio receiver ca 1924-1926 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
via Flickr
via NCC
Software Defined Radio ( SDR )
Shortwave Radio Antenna Voice of America Delano Transmitting Station ( via wiki )
A collection of early quartz crystal frequency standard units used in crystal oscillators produced by Bell LabsATampTVectron International ( via wiki )
A pair of 1968 Heathkit vibrators ( via wiki )
Architectures of Radio Receivers
bull Crystal Radio ( )
bull Tuned radio frequency ( TRF ) ndash
bull Reflex receiver ndash
bull Homodyne ( Direct-Conversion ) ndash
bull ( Super ) regenerative ndash ( )
bull Autodyne ndash
bull ( Super ) heterodyne ndash ( )
bull ( heterodyne regenerative autodyne ) detection
bull
Image A drawing of an early vacuum tube radio receiver and horn loudspeaker from an advertisement in a radio magazine around 1922 ( via wiki )
Crystal Radio
bull Crystal Radio ( )
bull Cats whisker detector ( Galena )
bull Germanium transistors
bull Crystal earpiece
bull Needs well grounding
bull Variable LC
bull Easy to make
bull Sensitivity Poor
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Poor
Image Sketch of crystal radio set ( via wiki )
Block diagram of a crystal radio receiver ( via wiki )
A circuit of an inductively-coupled crystal radio receiver with impedance matching ( via wiki )
Crystal radio diagram in 1922 This circuit did not use a tuning capacitor but used the capacitance of the antenna to form the tuned circuit with the coil ( via wiki )
Ernst Jahnke crystal radio receiver ca 1924-1926 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
via NCC
Software Defined Radio ( SDR )
Shortwave Radio Antenna Voice of America Delano Transmitting Station ( via wiki )
A collection of early quartz crystal frequency standard units used in crystal oscillators produced by Bell LabsATampTVectron International ( via wiki )
A pair of 1968 Heathkit vibrators ( via wiki )
Architectures of Radio Receivers
bull Crystal Radio ( )
bull Tuned radio frequency ( TRF ) ndash
bull Reflex receiver ndash
bull Homodyne ( Direct-Conversion ) ndash
bull ( Super ) regenerative ndash ( )
bull Autodyne ndash
bull ( Super ) heterodyne ndash ( )
bull ( heterodyne regenerative autodyne ) detection
bull
Image A drawing of an early vacuum tube radio receiver and horn loudspeaker from an advertisement in a radio magazine around 1922 ( via wiki )
Crystal Radio
bull Crystal Radio ( )
bull Cats whisker detector ( Galena )
bull Germanium transistors
bull Crystal earpiece
bull Needs well grounding
bull Variable LC
bull Easy to make
bull Sensitivity Poor
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Poor
Image Sketch of crystal radio set ( via wiki )
Block diagram of a crystal radio receiver ( via wiki )
A circuit of an inductively-coupled crystal radio receiver with impedance matching ( via wiki )
Crystal radio diagram in 1922 This circuit did not use a tuning capacitor but used the capacitance of the antenna to form the tuned circuit with the coil ( via wiki )
Ernst Jahnke crystal radio receiver ca 1924-1926 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Software Defined Radio ( SDR )
Shortwave Radio Antenna Voice of America Delano Transmitting Station ( via wiki )
A collection of early quartz crystal frequency standard units used in crystal oscillators produced by Bell LabsATampTVectron International ( via wiki )
A pair of 1968 Heathkit vibrators ( via wiki )
Architectures of Radio Receivers
bull Crystal Radio ( )
bull Tuned radio frequency ( TRF ) ndash
bull Reflex receiver ndash
bull Homodyne ( Direct-Conversion ) ndash
bull ( Super ) regenerative ndash ( )
bull Autodyne ndash
bull ( Super ) heterodyne ndash ( )
bull ( heterodyne regenerative autodyne ) detection
bull
Image A drawing of an early vacuum tube radio receiver and horn loudspeaker from an advertisement in a radio magazine around 1922 ( via wiki )
Crystal Radio
bull Crystal Radio ( )
bull Cats whisker detector ( Galena )
bull Germanium transistors
bull Crystal earpiece
bull Needs well grounding
bull Variable LC
bull Easy to make
bull Sensitivity Poor
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Poor
Image Sketch of crystal radio set ( via wiki )
Block diagram of a crystal radio receiver ( via wiki )
A circuit of an inductively-coupled crystal radio receiver with impedance matching ( via wiki )
Crystal radio diagram in 1922 This circuit did not use a tuning capacitor but used the capacitance of the antenna to form the tuned circuit with the coil ( via wiki )
Ernst Jahnke crystal radio receiver ca 1924-1926 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Shortwave Radio Antenna Voice of America Delano Transmitting Station ( via wiki )
A collection of early quartz crystal frequency standard units used in crystal oscillators produced by Bell LabsATampTVectron International ( via wiki )
A pair of 1968 Heathkit vibrators ( via wiki )
Architectures of Radio Receivers
bull Crystal Radio ( )
bull Tuned radio frequency ( TRF ) ndash
bull Reflex receiver ndash
bull Homodyne ( Direct-Conversion ) ndash
bull ( Super ) regenerative ndash ( )
bull Autodyne ndash
bull ( Super ) heterodyne ndash ( )
bull ( heterodyne regenerative autodyne ) detection
bull
Image A drawing of an early vacuum tube radio receiver and horn loudspeaker from an advertisement in a radio magazine around 1922 ( via wiki )
Crystal Radio
bull Crystal Radio ( )
bull Cats whisker detector ( Galena )
bull Germanium transistors
bull Crystal earpiece
bull Needs well grounding
bull Variable LC
bull Easy to make
bull Sensitivity Poor
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Poor
Image Sketch of crystal radio set ( via wiki )
Block diagram of a crystal radio receiver ( via wiki )
A circuit of an inductively-coupled crystal radio receiver with impedance matching ( via wiki )
Crystal radio diagram in 1922 This circuit did not use a tuning capacitor but used the capacitance of the antenna to form the tuned circuit with the coil ( via wiki )
Ernst Jahnke crystal radio receiver ca 1924-1926 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
A collection of early quartz crystal frequency standard units used in crystal oscillators produced by Bell LabsATampTVectron International ( via wiki )
A pair of 1968 Heathkit vibrators ( via wiki )
Architectures of Radio Receivers
bull Crystal Radio ( )
bull Tuned radio frequency ( TRF ) ndash
bull Reflex receiver ndash
bull Homodyne ( Direct-Conversion ) ndash
bull ( Super ) regenerative ndash ( )
bull Autodyne ndash
bull ( Super ) heterodyne ndash ( )
bull ( heterodyne regenerative autodyne ) detection
bull
Image A drawing of an early vacuum tube radio receiver and horn loudspeaker from an advertisement in a radio magazine around 1922 ( via wiki )
Crystal Radio
bull Crystal Radio ( )
bull Cats whisker detector ( Galena )
bull Germanium transistors
bull Crystal earpiece
bull Needs well grounding
bull Variable LC
bull Easy to make
bull Sensitivity Poor
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Poor
Image Sketch of crystal radio set ( via wiki )
Block diagram of a crystal radio receiver ( via wiki )
A circuit of an inductively-coupled crystal radio receiver with impedance matching ( via wiki )
Crystal radio diagram in 1922 This circuit did not use a tuning capacitor but used the capacitance of the antenna to form the tuned circuit with the coil ( via wiki )
Ernst Jahnke crystal radio receiver ca 1924-1926 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
A pair of 1968 Heathkit vibrators ( via wiki )
Architectures of Radio Receivers
bull Crystal Radio ( )
bull Tuned radio frequency ( TRF ) ndash
bull Reflex receiver ndash
bull Homodyne ( Direct-Conversion ) ndash
bull ( Super ) regenerative ndash ( )
bull Autodyne ndash
bull ( Super ) heterodyne ndash ( )
bull ( heterodyne regenerative autodyne ) detection
bull
Image A drawing of an early vacuum tube radio receiver and horn loudspeaker from an advertisement in a radio magazine around 1922 ( via wiki )
Crystal Radio
bull Crystal Radio ( )
bull Cats whisker detector ( Galena )
bull Germanium transistors
bull Crystal earpiece
bull Needs well grounding
bull Variable LC
bull Easy to make
bull Sensitivity Poor
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Poor
Image Sketch of crystal radio set ( via wiki )
Block diagram of a crystal radio receiver ( via wiki )
A circuit of an inductively-coupled crystal radio receiver with impedance matching ( via wiki )
Crystal radio diagram in 1922 This circuit did not use a tuning capacitor but used the capacitance of the antenna to form the tuned circuit with the coil ( via wiki )
Ernst Jahnke crystal radio receiver ca 1924-1926 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Architectures of Radio Receivers
bull Crystal Radio ( )
bull Tuned radio frequency ( TRF ) ndash
bull Reflex receiver ndash
bull Homodyne ( Direct-Conversion ) ndash
bull ( Super ) regenerative ndash ( )
bull Autodyne ndash
bull ( Super ) heterodyne ndash ( )
bull ( heterodyne regenerative autodyne ) detection
bull
Image A drawing of an early vacuum tube radio receiver and horn loudspeaker from an advertisement in a radio magazine around 1922 ( via wiki )
Crystal Radio
bull Crystal Radio ( )
bull Cats whisker detector ( Galena )
bull Germanium transistors
bull Crystal earpiece
bull Needs well grounding
bull Variable LC
bull Easy to make
bull Sensitivity Poor
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Poor
Image Sketch of crystal radio set ( via wiki )
Block diagram of a crystal radio receiver ( via wiki )
A circuit of an inductively-coupled crystal radio receiver with impedance matching ( via wiki )
Crystal radio diagram in 1922 This circuit did not use a tuning capacitor but used the capacitance of the antenna to form the tuned circuit with the coil ( via wiki )
Ernst Jahnke crystal radio receiver ca 1924-1926 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Crystal Radio
bull Crystal Radio ( )
bull Cats whisker detector ( Galena )
bull Germanium transistors
bull Crystal earpiece
bull Needs well grounding
bull Variable LC
bull Easy to make
bull Sensitivity Poor
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Poor
Image Sketch of crystal radio set ( via wiki )
Block diagram of a crystal radio receiver ( via wiki )
A circuit of an inductively-coupled crystal radio receiver with impedance matching ( via wiki )
Crystal radio diagram in 1922 This circuit did not use a tuning capacitor but used the capacitance of the antenna to form the tuned circuit with the coil ( via wiki )
Ernst Jahnke crystal radio receiver ca 1924-1926 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Block diagram of a crystal radio receiver ( via wiki )
A circuit of an inductively-coupled crystal radio receiver with impedance matching ( via wiki )
Crystal radio diagram in 1922 This circuit did not use a tuning capacitor but used the capacitance of the antenna to form the tuned circuit with the coil ( via wiki )
Ernst Jahnke crystal radio receiver ca 1924-1926 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
A circuit of an inductively-coupled crystal radio receiver with impedance matching ( via wiki )
Crystal radio diagram in 1922 This circuit did not use a tuning capacitor but used the capacitance of the antenna to form the tuned circuit with the coil ( via wiki )
Ernst Jahnke crystal radio receiver ca 1924-1926 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Crystal radio diagram in 1922 This circuit did not use a tuning capacitor but used the capacitance of the antenna to form the tuned circuit with the coil ( via wiki )
Ernst Jahnke crystal radio receiver ca 1924-1926 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Ernst Jahnke crystal radio receiver ca 1924-1926 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Tuned radio frequency ( TRF ) receiver
bull Tuned radio frequency ( TRF ) receiver
bull by Ernst Alexanderson 1916
bull RF Amplifiers Active Filters
bull IC ZN414 MK484 TA7642
bull Neutrodyne receiver ndash
bull by Louis Hazeltine 1922
bull Preventing oscillations
bull Reflex receiver ndash
bull by Wilhelm Schloemilch and Otto von Bronk 1914
bull Feedback loop
Image Top view of the Leutz Transoceanic Phantom radio receiver with its cover removed from 1927 ( via wiki )
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Tuned radio frequency ( TRF ) receiver
bull Pros
bull Active band pass filter
bull Cons
bull Hard tuning hard to build large
bull Sensitivity Medium
bull Selectivity Poor
bull Signal to noise ratio ( SNR ) Medium
Image The first Neutrodyne radio receiver built by Louis Hazeltine and presented at the March 2 1923 meeting of the Radio Society of America ( via wiki )
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Block diagram of TRF receiver ( via wiki )
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
A typical tuned radio frequency ( TRF ) radio receiver circuit from 1924 ( via wiki )
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Six tube radio receiver from about 1920 ( via wiki )
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
A basic circuit using the ZN414 AM detector transistor ( via wiki )
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
A hand made matchbox radio using the MK484 IC ( via mds975couk )
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Tuning stage comparison between common TRF receivers and Neutrodyne receivers ( via wiki )
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
The first neutrodyne radio receiver presented by Louis Alan Hazeltine in a lecture on March 2 1923 titled Tuned radio frequency amplification with neutralization of capacity coupling to the Radio Club of America at Columbia University ( via wiki )
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Block diagram of a simple single-tube reflex radio receiver ( via wiki )
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Circuit diagram of a reflex receiver One transistor amplifies both high frequency and low frequency ( via wiki )
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
A handmade 2 transistor reflex radio ( via )
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Homodyne Receivers
bull Homodyne receiver ( Direct-Conversion Zero-IF )
bull Mixer + Local Oscillator
bull Low convert to DC
bull Regenerative receiver
bull by Edwin Armstrong 1912
bull No significant Mixer and LO
bull Autodyne mixer ( Mixer LO 2 in 1 )
bull Hartley Colpitts configuration
bull Hysteresis ndash
bull Nearly self-oscillating
bull Regenerative control
Image An early vacuum tube regenerative radio receiver from 1922 ( via wiki )
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Super-regenerative Receivers
bull Super-regenerative
bull by Edwin Armstrong 1922
bull Quench oscillator in supersonic ( 30~100kHz )
bull Oscillations were interrupted periodically
bull Pros
bull Simple easy to make
bull Cons
bull Oscillator signal propagates through antenna
bull Signal interfered by flicker noise
bull Sensitivity Excellent
bull Selectivity Medium
bull Signal to noise ratio ( SNR ) Poor
Image American radio researcher Edwin H Armstrong and his new invention the superregenerative receiver in 1922 ( via wiki )
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Block diagram of a regenerative radio receiver ( via wiki )
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Vacuum tube regenerative receiver with Armstrong oscillator schematic ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Homebuilt Armstrong one-tube regenerative shortwave radio with construction characteristic of the 1930s - 40s ( via wiki )
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Schematic of the simple regen receiver A Simple Regen Radio for Beginners ndash ARRL ( via )
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
A High Performance Regenerative Radio - Circuitsalad ( via )
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Block diagram of a super-regenerative radio receiver ( ref )
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
A High Performance Regenerative Receiver High Performance Regenerative Receiver Design - ARRL ( via )
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
CK-103 FM ( via )
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Superheterodyne Receivers
bull Heterodyne receiver
bull by Reginald Fessenden 1901
bull Failed on the stability of LO ( ppt accuracy ) [wiki]
bull Continuous Wave ( CW ) receiver
bull Heterodyning Animation [link]
bull Super-heterodyne receiver
bull by Edwin Armstrong 1918
bull Supersonic IF stage ( 455kHz 107MHzhellipetc )
bull Stable reliable until the transistor era [wiki]
bull Regency TR-1
bull Sony TR-52 TR-55
Image One of the first prototype superheterodyne radio receivers built by inventor Edwin Armstrong ( via wiki )
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Superheterodyne Receivers
bull Pros
bull Simple stable enough to commercialize
bull Excellent performance
bull Cons
bull More stages than a regen radio
bull Tracking LO and Image filter
bull Sensitivity Excellent
bull Selectivity Excellent
bull Signal to noise ratio ( SNR ) Excellent
Image American engineer Edwin with his new wife and a portable superheterodyne radio receiver ( via wiki )
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Block diagram of a superheterodyne receiver ( via wiki )
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Graph showing how a superheterodyne radio receiver receives a radio signal shifting it down to the IF frequency ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
All American Five vacuum-tube superheterodyne AM broadcast receiver from 1940s ( via wiki )
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Vintage Regency TR-1 Transistor Radio Made in the USA ( via wiki )
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Vintage Regency TR-1 Transistor Radio ( via wiki )
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Inside view of Regency model TR-1 transistor receiver showing layout of components ( via radiomuseum )
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
A copy of the patent of Regency TR1 by Richard Koch assigned to IDEA ( via radiomuseum )
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
The Schematic diagram of the of Regency model TR-1 ( via radiomuseum )
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
S66D ( via )
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
TR-52 Sony ( ) 1955 1 ( via wiki )
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Double conversion superheterodyne block diagram ( via wiki )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
DIY SDR HF Up-Converter forr RTLSDR by WA7JHZ ( retrovoltagecom )
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
bull FM
bull
bull FM AM
bull
bull ( RTL-SDR )
bull 60MHz
bull Manhattan-style Circuit Construction [Link]
bull A Simple Regen Radio for Beginners ndash ARRL [Link]
Image IC ndash CD9088 AM FM
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
FM SCAN RESET
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
FM Transmitter Bugs
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Astable Multivibrator Kit
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
( 2014~2015 ) BuckBoostLinear Regulators more Crystal Radios and FM Txs
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
( 2015~2016 ) More Radios ( RX ) Audio Amps amp Testing Tool
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
A Simple Regen Radio for Beginners By Charles Kitchin N1TEV
bull BJT ( 2N2222 )
bull LM386
bull Hartley 2L1C
bull Fine Tune
bull FM
bull
bull 56~119MHz ( Pi-FM-RDS )
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
2N2222
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
High Performance JFET Regen by Ray Charles Ring circuitsaladcom
bull Common Gate Antenna Buffer
bull JFET
bull LM317 5V
bull LM386 ( TDA7052 )
bull 50K JFET LM386
bull Colpitts 1L2C
bull PCB
bull Toroid
bull [Link1] [Link2]
bull 5~18MHz
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
T50-52 ( ) 5uH
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
T37-6
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
L
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
Poor manrsquos solutions
bull Calculators
bull Toroid coil calculator [Link]
bull Air coil calculator [Link]
bull LC tank Frequency Calculator [Link]
bull Google Search Plot [Link]
bull Android APP - ElectroDroid [Link]
bull Simulators
bull GNURadio [Link]
bull Falstad Circuit Simulator [Link]
bull Audacity [Link]
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
bull Measurements
bull Cheap sound card as a signal generator
bull Arduino
bull Frequency Generator [Link]
bull Frequency Counter Library [Link]
bull FHT Library [Link]
bull Serial Plotter [Link]
bull Pi-FM-RDS Project [Link]
bull AVR Component Tester [Link]
bull RTL-SDR SDR-Sharp [Link]
bull Making
bull Self-designed Manhattan Circuit Helper [Link]
Poor manrsquos solutions
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
References
bull Wikipedia
bull Radio receiver [Link]
bull Crystal Radio [Link]
bull Tuned radio frequency receiver [Link]
bull Neutrodyne receiver [Link]
bull Reflex receiver [Link]
bull ZN414 [Link]
bull Direct-convertion receiver [Link]
bull Regenerative receiver [Link]
bull Armstrong oscillator [Link]
bull Superheterodyne receiver [Link]
bull Edwin Howard Armstrong [Link]
bull Regency TR-1 [Link]
bull Sony TR-52 [Link]
bull Blogs
bull ldquo rdquo [Link]
bull [Link]
bull Radio Experimenters Blog [Link]
bull Circuitsaladcom [Link]
bull Dave Richards AA7EE [Link]
bull YouTube Channels
bull W2AEW [Link]
bull Mr Carlsons Lab[Link]
bull EEVblog [Link]
bull Afrotechmods [Link]
bull RimstarOrg [Link]
The End Thanks for Listening
The End Thanks for Listening
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