Alan wrote:
In article brianDG303 writes:
Is there a downside to mounting on a ground plane inside the fuselage
of a non-carbon glass glider?

Since the ground plane should extend at least 23 inches in each
direction around the antenna, it is probably hard to get that inside
the glider.

That sounds like a dimension for the aircraft communication radio,
working in the 120-130 mhz range. The transponder uses 1090 mhz, about
10 times higher. That indicates a 2.3" radius ground plane would be
adequate, or the 6" diameter Marc points out as commonly used.

--
Eric Greenwell - Washington State, USA
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* Updated! "Transponders in Sailplanes" http://tinyurl.com/y739x4
* New Jan '08 - sections on Mode S, TPAS, ADS-B, Flarm, more

* "A Guide to Self-launching Sailplane Operation" at www.motorglider.org