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aerial mounts on a car roof

  • 17-10-2008 1:03pm
    #1
    humaxf1
    Registered Users, Registered Users 2 Posts: 865 ✭✭✭


    Hi all,

    Are there any considerations about having a V/UHF dual band whip and a CB whip on a car roof. Should there be a certain distance between them? Only one band will be transmitting at a time!

    Thx


Comments

  • #2
    watty
    Registered Users, Registered Users 2 Posts: 32,417 ✭✭✭✭watty


    I've had 4 whips on roof. It does affect the directionality and I sweep back the car radio Aerial to minimise pickup by it.

    I've used 10m/6m whip on 10m/6m at 5W same time as VHF/UHF W770 running 50W/35W OK (about 1m apart on Peugot 106 roof).

    I've also used the 10m/6m whip on 80m .. 10m at 25W from a Racal syncal30 and 40m to 17m using 80W via home brew amp from FT817 5W radio while the 2m/70cm (VHF/UHF) was running.

    Iv'e used a CB whip also for CB and for 160m to 10m on the 25W Racal with no problem (no CB contacts, but heard churches on upper band).

    A bigger whip needs a large triple magnet base. Esp. the 10m/6m dual band whip which has good SWR on 11m also and works OK down to 7MHz using the Elecraft T1 Auto ATU. The Racal military radio is of course designed to tune a 8ft whip down to 1.5MHz! It has a large internal drum and a metal spindle. Gold braided cord is wound from spindle to drum manually as frequency reduced from 30MHz to 1.5MHz.


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