My pht VHF T6 50WI. Gii thiu chung My pht a mode VHF cng sut 50W
T6T c s dng trong mi trng a tnh nh sn bay hoc en-route centre. N lm
vic vi thoi tn s t 118 n 136.975 MHZ vi model tiu chun, t 112 n
155.975 MHZ vi model m rng tn s v cc dng d liu c quy nh bi ICAO. Da
vo phn mm trong my pht, cc ch hot ng sau c th c la chn: - AM-Thoi.
Tt c cc my pht u c ch ny - AM-MSK(optional) - Mode 2(optional) -
Mode 3(optional) Cc model v part number M t My pht T6T 50W tiu chun
Part Number B6350/NB/50 Di tn 118136.975 MHZ Phn cch knh(AMThoi) 25
kHz hoc 8.33 kHz Cc ng dng c bit Tt c cc model u cung cp hot ng
offset 2;3;4 v 5 sng mang khi s dng phn cch knh l 25 kHz Tt c cc
model u cung cp hot ng offset 2 sng mang khi s dng phn cch knh l
8.33 kHz
My pht B6350/WB/50 T6T 50W m rng tn s My pht B6350HS/NB/50 T6T
HS 50W tiu chun vi pht n nh cao My pht B6350HS/WB/50 T6T HS 50W m
rng tn s vi pht n nh cao
112155.975 MHz 118136.975 MHz
25 kHz hoc 8.33 kHz 25 kHz hoc 8.33 kHz
112155.975 MHz
25 kHz hoc 8.33 kHz
Bng 1.1: Cc model v part number ca mt pht T6T Ch : Mc d tt c cc
model u c kh nng chn phng thc hot ng offset nh trn nhng khi chn ta
phi m bo model ph hp vi iu kin mi trng hot ng. Lp t c kh My pht t
va trong v thit b cng nghip tiu chun 19 inch(483 mm) v chim 2U khng
gian. La chn tn s My pht is a single frequency sysnthesised radio,
n c th hot ng vi gin cch knh 25 kHz v 8.33 kHz. My pht nhn din c cc
tn s c quy nh bi ICAO v t ng iu chnh phng thc gin cch knh chnh xc.
Vi hot ng a knh , my pht c th lu c ti 100 knh t trc tn s v c th gi
li c cu hnh. Ta cng c th chn tn s hot ng cho my bng panel pha trc
ca my hoc thit b iu khin t xa tng t.
II. c tnh k thut 1. Cc c tnh k thut chung Cc c tnh k thut chung
ca my pht th khng thay do vic la chn ch hot ng. Tt c cc my pht u c
th hot ng ch AM-thoi. Cc phn mm thm vo cho php my hot ng ch AM-MSK,
Mode 2 hoc Mode 3 Cc model my pht Bng 2.1: Cc model my pht M t My
pht T6T 50W tiu chun Part Number B6350/NB/50 Di tn 118136.975 MHZ
Phn cch knh(AMThoi) 25 kHz hoc 8.33 kHz Cc ng dng c bit Tt c cc
model u cung cp hot ng offset 2;3;4 v 5 sng mang khi s dng phn cch
knh l 25 kHz Tt c cc model u cung cp hot ng offset 2 sng mang khi s
dng phn cch knh l 8.33 kHz
My pht T6T 50W m rng tn s My pht T6T HS
B6350/WB/50
112155.975 MHz 118136.975
25 kHz hoc 8.33 kHz 25 kHz hoc 8.33 kHz
B6350HS/NB/50
50W tiu MHz chun vi pht n nh cao My pht B6350HS/WB/50 112T6T HS
155.975 50W m MHz rng tn s vi pht n nh cao
25 kHz hoc 8.33 kHz
Ch : Mc d tt c cc model u c kh nng chn phng thc hot ng offset nh
trn nhng khi chn ta phi m bo model ph hp vi iu kin mi trng hot ng.
S lng knh My pht c th lu tr t 1 tn s n ti 100 tn s trong b nh knh
ca my m khng cn thm phn cng
chnh xc tn s Tt c cc model tr model HS th chnh xc u hn 1ppm Vi
model HS th chnh xc hn 0.3 ppm Yu cu v ngun My pht lm vic vi ngun
cp l ngun xoay chiu AC, hoc ngun 1 chiu DC. Khi ta cp c 2 ngun th
ngun 1 chiu DC hot ng nh ngun d phng cho ngun xoay chiu AC. Ngun
xoay chiu: My pht hot ng vi ngun xoay chiu 1 pha vi tn s t 48 n 62
Hz v n s t ng iu chnh lm vic vi di in p t 110Vac n 230Vac vi chnh
xc 10%. Bng di y s a cng sut tiu th ngun. Ngun 1 chiu: My pht lm
vic vi ngun 1 chiu c in p t 21.6V n 32V. Dng c a ra di bng sau. Yu
cu Ln nht Khng hot ng Ngun AC 500VA 60VA Ngun DC 12A 1A
Chc nng ch(Standby facility) My pht c chc nng ch ko di tui th ca
ngun cp khi n khng hot ng Kch thc v khi lng Kch thc v khi lng ca my
nh sau: - Rng : 483 mm(19 inch). - Cao : 88.9 mm(3.5 inch). - Dy:
430 mm(16.9 inch) o t mt trc my n mt sau my 450 mm(17.8 inch) o t
mt trc my ti pha sau qut - Nng: 13.5 kg(29.76 pound) * Mi trng lm
vic - Di nhit lm vic: My pht lm vic bnh thng trong khong nhit t -20
n + 55 C. My c th t trong khong nhit t -30 n +70 C m khng gy ra hng
hc - m: My pht hot ng bnh thng trong khong gi tr m tng i t 5% n 90%
- cao: My pht hot ng bnh thng cho n cao 15.000 feet. Ngoi ra my cng
c th c t v tr c cao cho n 50.000 feet m khng b hng. - Chng rung v
va p: My pht c thit k theo chun bo v rung v va p MIL-STD-810E, phng
thc 516.4, quy trnh VI- Bench Handling - Lm mt: My pht c lm mt bi
qut bn trong my, qut ny s lun chy vi 1 na tc ti a. Khi nhit ca khi
khuch i cng sut RF( RF PA) ln ti 45 C th qut ny s chy vi tc ti a v
khi nhit gim xung 40 C th n s li chy vi 1 na tc ti a. My pht cn c 1
qut kim kim sot nhit khc nm trong phn ngun na. - Thi gian khi ng:
Vi tt c cc model th cc my pht u lm vic bnh thng sau 20 giy tnh t lc
bt my tr model T6T HS. Model ny cng lm vic sau 20 giy t lc bt my
nhng n cn khong 10 pht c th t c chnh xc ca sng mang offset.
2. Ch AM My pht c th hot ng ch chun AM-thoi v ch AM-MSK (thm).
Cc ch tiu k thut di y u p dng vi tt c cc model: Tr khng u ra: 50
ohm Cng sut u ra RF: Cng sut u ra sng mang RF c iu chnh t 5W n 50W
vi bc chnh 1W. Cng sut ti a c th chn cng b gii hn. Cng sut u ra cng
c kim sot 1 cch t ng bi cc iu kin di y: - Di tn s: S dao ng ca cng
sut vn trong khong t 0 n +1 dB trn di tn s hot ng. - in p cp thp: S
dao ng ca cng sut vn t -1 n +1 dB vi in p cp trong khong t 24 n 32
Vdc - H s sng ng(VSWR) cao: Li vng(loop error) c th lm gim cng sut
pht x ti 3 dB. S thay i ca cng sut trong khong 1 dB dn n h s sng ng
c th ln ti 2.5:1. Vi gi tr ca h s sng ng cao hn th cng sut u ra c
th b gim xung 10 dB 1 dB - Nhit ca khi khuych i cng sut RF(khi RF
PA) cao: Nu nhit cm ng nhit ca khi khuych i cng sut RF vt qu 80 C
th cng sut ra gim xung cn 3 dB 1dB. Nu nhit cm ng nhit ca khi
khuych i cng sut RF vt qu 90 C, my pht s ngt key v t ng key li khi
nhit xung cn 70 C - Rise time: Duty cycle 100% continuous
operation
Phn cch knh Vi ch AM- thoi: My pht cho php c gin cch knh l 25
kHz v 8.33 kHZ Vi ch AM-MSK: Gin cch knh l 25kHz S lng sng offset -
My pht khng phi model HS(ch AM-thoi): Vi my pht khng phi model HS
th s lng sng offset c miu t nh trong bng 2.1 vi chnh xc tn s l hn 1
ppm
My pht model HS(ch AM-thoi): My pht model HS th hot ng vi s lng
sng offset c miu t nh trong bng 2.1 vi chnh xc tn s l hn 0.3 ppm -
Vi ch AM-MSK: khng hot ng vi sng offset Harmonic output.-
Spurious output . Intermodulation 3. Cc c tnh iu ch ca my pht Ch
- Vi ch AM-thoi: Ch AM-thoi s dng phng php iu ch bin (AM) song
bin(DSB) ton sng mang; pht x 6k80A3EJN vi cc knh 25 kHz v 5K00A3EJN
vi cc knh 8.33 kHz. - Vi ch AM-MSK: Ch AM-MSK s dng phng php iu ch
bin (AM) song bin(DSB) ton sng mang, pht x 13K0A2DJN su iu ch su iu
ch ca my pht ti a c th t c l 95%. Chnh iu ny s loi b nhiu cc knh ln
cn vi c gin cch knh 25 kHz v 8.33 kHz Hum v nhiu Mc ca hum v nhiu
hn 45 dB di mc ca tn hiu vi mc tn hiu u vo nh hn -13 dBm; v s hn
50dB di mc tn hiu khi mc tn hiu u vo ln hn -13dBm, cho 1 sng mang c
iu ch bi tn hiu 1 kHz vi su iu ch l 90%. p ng tn s(frequency
response). - Vi gin cch knh 25 kHz: i vi ch AM-thoi v ch AM-MSK th
s thay i ca p ng tn s s mo ca tn hiu. Residual FM
Vi 1 tn hiu kim tra tn s 1 kHz v iu ch 80% a vo u vo ca my pht
th nh tn s iu ch khng mong mun(the unwanted peak frenquency
modulation) s khng vt qu 500 Hz VOGAD - Vi ch AM-thoi: VOGAD c di
hot ng l 30 dB vi mc ngng c t 10 dB di mc tn hiu thoi trung bnh c t
trn i dy u vo(the average speech line level setting). Trong di
VOGAD th su iu ch vn duy tr mc c t 10%. . - Vi ch AM-MSK: The VOGAD
is disabled Mute-
Vi ch AM-thoi: Mc mute c t 15 dB di mc tn hiu thoi trung bnh c t
trn i dy u vo(the average speech line level setting). The mute can
be disabled - Vi ch AM-MSK: The mute is disabled
Differential Group delay Vi ch AM-MSK: . 4. iu kin my pht m tn u
vo m tn c th c a vo my pht qua microphone panel pha trc my. m tn
cng c th c a vo qua i dy 600 cn bng u vo. Mc tn hiu u vo c t t
trong khong t -30 n +10 dBm PTT My pht c th key vi 1 microphone tng
thch c cm panel pha trc. My pht cng c th key c thng qua 1 u vo PTT
trc tip hay thng qua phantom keying superimposed trn i dy m tn hoc
qua bo hiu m PTT trn i dy m tn. PTT time out
III.Hot ng ca my pht1. Cc hin th, iu kin v kt ni mt my Trong phn
ny s m t cch iu kin my pht, cc hin th v cc kt ni mt trc my. a/Mt
trc my. Mt trc ca my c minh ha di y
Nm xoay v chn mn hnh LCD Nm xoay chn v mn hnh LCD c dng ci t hu
ht ch hot ng ca my pht. Trong lc hot ng mn hnh s hin th tn s hot
ng, s knh(nu chc nng lu gi knh c s dng), sng mang offset(nu dng) v
hin th th m t cng sut nh tc thi. Mn hnh LCD hnh trn cho ta bit my
pht ang hot ng tn s 225.000 MHz, tn s ny c n nh l knh 100 v ang dng
offset +7.3 kHz.
n ch th sn sng(ready indicator) Khi n ch th mu xanh sng th my
pht sn sng hot ng v khng pht hin thy cc li BIT
n ch th pht(transmit indicator) Khi n ch th mu h phch sng th my
pht ang key my v c cng sut pht ra
n ch th cnh bo(alarm indicator) Khi n ch th cnh bo sng hoc nhy
sng th tc l pht hin ra li BIT. Ch th li c chia lm 2 mc l alarm v
alert:
Nu mc alert th n ch th cnh bo s nhy sng, n ch th sn sng vn sng v
my pht vn hot ng bnh thng. Trng hp ny xy ra khi: - Cng sut RF u ra
b gim hn 1 dB nhng cha qu 3 dB so vi cng sut RF t trong my pht. -
in p cp cho my gim xung di mc cho php. Nu mc alarm th n ch th cnh
bo s sng v n ch th sn sng s tt, khi my pht khng hot ng na. n ch th
trng thi standby 1 n ch th mu s sng khi my pht c t ch standby.
Trong ch standby, hu ht cc mch u khng hot ng, mn hnh LCD khng hin
th v my pht khng th key c. Ch standby c th c la chn hoc b chn bng
nm xoay chn bng cch khi to li cu hnh thng qua h thng MARC hoc thng
qua b iu khin T6 controller hay thng qua VFP. Reference connector 1
socket gic SMB cho php 1 b m tn s iu khin reference frequency ca
my. Kt ni ny ch dng cho mc ch bo dng. Vic kim tra v tinh chnh
reference frequency s c cp trong chng bo dng my. Kt ni vi
microphone C 1 kt ni cho php ni my pht vi c microphone v my tnh PC.
l kt ni 7-pin self-locking DIN socket, cc chn ra c m t trong bng
3-1 1 microphone ph hp vi kt ni ny c th iu khin my pht ch AM local.
1 my tnh PC cng c th kt ni vi my pht c th hin th VFP. Kt ni vi my
tnh c m t r trong bng 3-2.
Bng 3-1: S ra chn ca kt ni vi microphone
Chn 1 3 5 6
7
Tn hiu Input/output M t Chn t ca mic 0V Chn PTT Input 0V ti PTT
sidetone output 0V ti 3V nh-nh Tn hiu u vo mic input T 2 ti 35 mV
rms khi t ch th ng(passive setting) v t 8 ti 140 mV rms khi t ch ch
ng(active setting) duy tr trong di ca VOGAD Chn t 0V Bng 3-2: S ra
chn ca kt ni vi my tnh
Chn 2 4 7
Tn hiu Pht d liu Thu d liu t
Input/output output input
M t RS232, 115200 baud, 8data bits, 1 stop bit, no parity, khng
bt tay RS232, 115200 baud, 8data bits, 1 stop bit, no parity, khng
bt tay 0V
b/Swich cp ngun panel pha sau Khi switch cp ngun c t v tr
Standby, lc vn c in p bn trong mch cp ngun trong my. m bo an ton,
my pht phi c cch ly ra khi ngun cp in DC v AC. Switch cp ngun panel
pha sau l 1 nt 2 chiu(a 2-way rocker) c dng chn ch bt(on) v
ch(standby).
2.Ci t v hot ng ca my pht Vic ci t my pht c thc hin thng qua nm
xoay chn la chn cc thng s.
Cc thng s hot ng ca my cng c th dng VFP(Vitual Front Panel) ci t
thng qua h thng MARC( Multi-Access Remote Control) hoc thng qua b
iu khin T6 controller. Tt c vic ci t thng s ch hon thnh khi cc th
tc ci t-c cp trong chng ci t- kt thc. a/Trng thi hot ng bnh thng
Khi hot ng bnh thng th mn hnh LCD hin th tn s ang hot ng, s knh(nu
chc nng lu gi knh c s dng), sng mang offset(nu dng) v hin th th m t
cng sut nh tc thi khi khi my pht. Nu my pht t ch ch(Standby mode)
th mn hnh LCD s khng hin th g. b/S dng nm xoay chn Nm xoay chn c
dng chn cc trang iu khin, t c th ci t cc thng s cho my. Nm ny chng
ta c th xoay cng chiu, ngc chiu kim ng h hoc nhn. c/Screen Protocol
Giao thc di y c ng dng vi tt c cc trang mn hnh iu khin Mn hnh chnh
Khi my pht hot ng bnh thng th mn hnh chnh di y s c hin th
Switch Khi xoay nm theo chiu kim ng h th s i t tri qua phi v t
trn xung di. Khi xoay nm ngc chiu kim ng h th s i t phi qua tri, t
di ln trn. Khi ta nhn nm l ta chn 1 thng s no . Time out Nu trong
qu trnh ci t nm xoay chn khng hot ng trong 30 giy th mn hnh s quay
tr li mn hnh chnh. Nu vic thay i thng s khng thnh cng th my pht vn
gi nguyn gi tr thng s c. >> Khi c biu tng ny th tc l vn cn
trang iu khin tip theo. truy nhp ti cc trang ny th ta xoay nm theo
chiu kim ng h.
