John Tvedte wrote:

The suggestion was to make a 5.2" disc - @1090Mhz, 1/2 wave is
5.15229..."

Can someone give me a heads up as to what a tuned ground plane really
is?

I made similar disc for my antenna, it woks fine with the $20 TED antenna
http://www.aircraftspruce.com/catalo...ransponder.php

French authority required labo test: the emission power level mesured was
150W for 175 nominal for Becker ATC4401-175.

Becker people says a CD audio may do the job (only alumnium ones)

By
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Philippe Vessaire ҿӬ