[amsat-bb] Re: Antenna suggestions for mounting on vehicle for sat work.

Clayton Coleman W5PFG kayakfishtx at gmail.com
Thu May 24 08:11:35 PDT 2012


I have yet to find a better solution for FO-29, SO-50, and AO-27 mobile
than a combination of small UHF yagi with preamp for the downlink and a VHF
vertical for the uplink.  While the quadrifilar helix, eggbeaters, and 19"
whip all work, nothing gives me a 100% copy of all the LEO's from AOS to
LOS like the yagi/preamp combination.

I've tested the above mentioned fixed antennas for downlink across a
variety of Texas terrain and surrounding noise environments.  They all
work, some better than others, but are no where near the performance level
of a directional antenna.   Since I'm a firm believer that hearing the bird
is #1, I do not compromise with a vertical.   It's safer for me to pull my
vehicle over to a parking lot or rest area to work passes.  I have done a
few passes "in motion" with both the quad and the 19" whip and quite
frankly terrain/obstructions play such a huge role I hardly recommend even
attempting to do it unless you are on a flat, high plain.


On Thu, May 24, 2012 at 3:02 AM, Lee Maisel <maisel at lobo.net> wrote:

> Any ideas on a good antenna combo for mounting on a large vehicle?
>  Possibly roofrack, specifically for satellite work?
> Thanks!
> Lee
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