OpenBCM V1.07b12 (Linux)

Packet Radio Mailbox

SP7YDD

[OBCM_Elk]

 Login: GUEST





  
G8MNY  > TECH     08.05.22 09:32z 74 Lines 3193 Bytes #23 (0) @ WW
BID : 1695_GB7CIP
Subj: 23el 1296MHz Ant Repair Spec
Path: SP7YDD<SR8BBS<OK0NBR<F3KT<F1OYP<TI0RC<VE3CGR<KA1VSC<GB7CIP
Sent: 220508/0629Z @:GB7CIP.#32.GBR.EURO #:1695 [Caterham Surrey GBR] $:1695_GB
From: G8MNY@GB7CIP.#32.GBR.EURO
To  : TECH@WW

                                      (New Jan 99)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
From: M0ATV@GB7DEE.#51.GBR.EU

If like me, your antenna's suffered damage during the recent severe winds then
here is some handy specs for the 23 element 1296 MHz tonna, which I had fall
down, & suffer much damage to the very fragile tiny elements, luckily I had
measured them all before installing the antenna, & was able to make my own
replacements from brass brazing rod.

                **** This info is for repair purposes only  ****

      PLEASE ENSURE ALL YOUR PAGING PROMPTS ARE SWITCHED OFF i.e OP, or
                drawing will be unreadable & incorrect.

     23 Element Tonna (1296 MHz spec) dimensions for repair purposes only
     --------------------------------------------------------------------
                   Fig 1. Actual Element lenghts in mm

   106
      *    97    94    92    90    90    90    90    90    90    90
  ͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͻ
  ͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͼ
        100   95    92    91    90    90    90    90    90    90    90

               ( * DENOTES MAIN DRIVEN DIPOLE....SEE BELOW)

----------------------------------------------------------------------------
                 Fig 2. Distances between elements in mm
    R
      *
  ͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͻ
  ͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͳͼ
    34 25 34 60 65 63 77 86 86 87 87 87 87 87 87 87 87 87 87 90 87 71

                     R - DENOTES MAIN REAR REFLECTOR
                     * - DENOTES MAIN DRIVEN DIPOLE
----------------------------------------------------------------------------
                     Fig 3. Folded Dipole dimensions

                      100 Ŀ
                    ͻ Ŀ
                                                      
                          MAIN FOLDED DIPOLE         26
                                                      
                        ͼ 
                                |      |
                            32   |      |
                           _____|      |______
                           |                  |
                           |    MAIN BOOM     |
                           |__________________|


ALL elements stand 41mm high from boom & are offset by non conductive arms.
LAST element is 15mm from end of boom
MAIN rear reflector starts 15mm in from boom
FOLDED DIPOLE is fed direct via 535mm length (multi halfwave) of feeder
FOLDED DIPOLE stands 32mm high from boom
FOLDED DIPOLE total uncoiled length 265mm
------------------------------------------------------------------------
Well, there you have it, hope this has been of some use to other unfortunate
souls who lost valuable elents during the storms, good luck with your repairs.

                 73 de Tony M0ATV South Liverpool @ GB7DEE


Why don't U send an interesting bul?

73 De John, G8MNY @ GB7CIP


Read previous mail | Read next mail


 16.05.2022 08:46:14zGo back Go up