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Indoor antennas תויתיב םינפ תונטנא antennas-lh.pdf15 Indoor antennas - תויתיב םינפ תונטנא 4X4LH ובוק ילא תאמ הנטנא םיקהל תורשפא

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  • 15

    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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