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G8MNY  > TECH     16.08.19 11:30l 72 Lines 3196 Bytes #2 (0) @ WW
BID : 17791_GB7CIP
Read: GUEST
Subj: 4m 5/8 Vertical
Path: ED1ZAC<ED1ZAC<CX2SA<N3HYM<GB7CIP
Sent: 190816/0920Z @:GB7CIP.#32.GBR.EURO #:17791 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To  : TECH@WW

From: ANDY G6OHM@GB7HOL.#22.GBR.EU                    (new Nov 04)

             FIVE-EIGHTHS VERTICAL FOR 4M
             ============================
THE ANTENNA IS BASED ON A DESIGN FROM THE ARRL HANDBOOK.
THE ANTENNA IS MADE FROM AN OLD CB ANTENNA.
THIS ARTICLE WAS TAKEN FROM THE 4M NEWSLETTER WRITTEN BY G7RSD.
                 __
                 ||
                 ||
                 ||
                 || 
                 ||                     |    |
                 ||                     |    |
                 ||                     |    |
            ^    ||                    B|____|
LENGTH TO TOP    ||                      |//|   7 TURNS 16 SWG
 OF COIL       > ||                      |//|   COPPER WIRE ON 22MM
  2680MM         ||                      |//| < DIA GRP TUBING.
                 ||                      |//|   10 MM BETWEEN TURNS,
                 ||                      |//|   APROX.
                 ||                      |//|   LENGTH OF GRP TUBE
                 ||                      |//|   130 MM.
                 ||                      |//|  COILS SELF TAPPED ONTO
                |  |                     |//|  ALLI TUBING EACH END.
                |  |               _____B|//|
                |  |               I    |----|< RUN COPPER WIRE TO
                |  |               I    |    |  UHF SOCKET.SELF TAP
                |  |              MMM***|    |  BRACKET TO ALI TUBE
                |  |              MMM  *|    |
                |__|                    |    |
                 ||
                 || < COIL
                 ||
                 ||
                 ||           CIRCULAR GROUND PLANE 270 MM DIA.6mm ROD.
             I---||           GROUND PLANE MADE IN A SPIRAL .THE FREE END
       //////I//////////////  IS JOINED BY A SHORTING BAR TO THE BOTTOM
             I  |--|B///////  ROD JUST PASSED WHERE THE ROD COMES OUT
           MMM**|  |          OFF THE BOTTOM ALI SECTION.THE BOTTOM ALI
           MMM *|  |          SECTION LENGTH IS 400MM.
               *|  |          YOU WILL NEED AN ADJUSTMENT AT THE FREE END
        ///-----|  |          OF THE GROUND PLANE TO HELP VSWR.
        ///-----|  |
        ///     |  |
        ///     |  |
        ///     |  | < 400 MM              270 MM DIA CIRCLE
        ///_____|  |                      ...................
        ///_____|__|                      .                 .
        ///                               .                 .
        ///                               .       00        .
        ///                               .        I        .
        ///                               .        I        .
        ///                               .        IIIIIIIII.
                                          .............//...
                                                         ^
                                            // INDICATE SHORTING BAR &
                                            EXTRA PIECE FOR ADJUSTMENT

         LENGTH OF ROD TO MAKE CIRCULAR GROUND PLANE IS 1070MM

73 - ANDY, G6OHM @ GB7HOL


Why Don't U send an interesting bul?

73 De John G8MNY @ GB7CIP



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