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Indoor antennas - 4X4LH
, 4X4JW
( , . ) . .
. , ,
. , . 1 . ,
, ~ dB2 . 95 450-600 . Front to Back ,
.
: 2 Beam - : 1 ) (
! , ,
, ! . ) (
. , , 3 2 ) 600( . ,
. " . , " ,
, , " .2 ." 10~5 , . . , . . Scotch 3M , ,
.... , - . . .
,4 ,
... . , .
\2 , . .RG58, 213 etc
16
33% )Velocity factor) 0,66 - , .3 .
, . SWR , ) ( .
.8 .1:1,3 SWR ,1:1,2 . ,
: ? . . ,
: 3 .Zepelin Endfed
" ) ( , . .
. - . - spacers . .
." 30 , . " 30
. - shack ) " ( " .
. 4 . - .!And you are in business
17
. Zeppelin : 4 L : 5
" " . ""
, . 50 ATU
. . 50 " ) 6-5 ( T L
! AGC T : 6
:, , . .1 . .2 . , .3 .4 . SSB CW .5 . 150 .6 .7
). (
. . : 7
18
. . , , ",
. .7
. "" jx -jx+ . ,
x, , , ? . jx !
- , . - jx , , +. jx,. " , -
. .Number Complex ,
, " ! . . .
.8 . Skin effect , ~ ). (
)2( ) 1( " :8
. 100 , -
: ! Beam . !
). (
19
Loop : 9 . - Andy Foad G0FTD Loop .
. . . 25
. - 9 - ,3dBd~ . ,
Rule of thumb - . " !" ")Stubs ( RG58 .
. . " " " " . stub
, RF . 1:1,2 ~ .
Band 160m 80m 40m 30m 20m 17m 15m 12m 10m 6m
Stub Length 70cm 5cm 19cm 38cm 20cm 6cm 7cm 12cm 5.5cm 8.5cm
Stub . " Windom :
.
! - Windom : 10
20
, Loren Windom W8GZ " 1929 . ,
" - , 3,5 - !
. 7 , " : 10 .
". ) ( . -
! 2\3--1\3 , A,A . Windom : 11
.11 . , . RF Choke . 5 A
. , " "
.ATU , SWR , 30 15 KH2D :12
3.800mHz 1.5:1 7.000 2.2:1
10.125 3.4:1 14.000 1.9:1 18.110 1.5:1 21.100 1.5:1 24.900 1.4:1 28.500 2.1:1
21
" 30 15 - " - Guam KH Jim . . " "
.50 : . . 2.5:1 "
. , ! - .
." - " . ,
, RG58 150 ."" , RF Choke
. SSB , " , , ,
! ..."
Reference: antenneX archive Karl Rothammel Y21BK Antennenbuch ARRL Compendium 1-5 L.B.Cebik W4RNL Igor Grigorov RK3ZK Tape Antennas F.H.V. Geerligs PA0FRI
4X4KF RSGB
, , ARRL ) Elser-Mathes Cup) - - . 80
, , , .
. .
, , . 1920 .
, " 1600 . , - .
QSO , . ! , , ) , (
. ! . .
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