Jeffrey
You dont need a ground plane, use a dipole antenna, much better radiation
pattern
than the 1/4 wave whips used in traditional metal aircraft. Bob Archer used
to sell them at Aircraft Spruce.
Graham
> On 17 Aug 2019, at 04:14, Jeffrey Williams <jeffwill55@sbcglobal.net> wrote:
>
>
> Maybe this one is for Bud Yerly, but anyone can chime in.
>
> I am installing instruments in my Europa XS and was told all transponders need
a ground plane. My research indicates a 12 inch circle of thin copper or
aluminum
will do, but that the ground plane and the antenna should be outside the
aircraft so things like the engine and other metal stuff doesnt interfere with
the signal. I have a Mode C and a Mode S to deal withand a GPS and Comm antenna
too, but those dont seem to need a ground plane. I am being informed that
these antennas need to be at least 40 inches apart as well. Also, I have been
told that putting the antenna itselfoutside the aircraft and the ground plane
inside is a bad idea that screws up the signal.
>
> Is any of this correct? What did you guys do?
>
> Regards,
>
> Jeff Williams
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