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A transponder antenna is only 2-3/4 inches long. That is a quarter wave
length at the transponder operating frequency. A disk as small 5-1/2 inches in diameter will provide an adequate groundplane. Wayne http://www.soaridaho.com/Schreder "Orval Fairbairn" wrote in message news In article , "Mads" wrote: Anyone with depth knowledge of groundplanes for transponders? - their mission (any theory would be appreciated)? They complete the electronic circuit for the antenna. - required dimension 1.5 feet from the center of the antenna should work fine. (1/4 wave) - required shape (is a cross OK or does it have to circular) Eight crossing strips of aluminum tape, about 3 feet long, should do quite nicely. - material (is aluminium tape OK?) Yes -- as long as you have electrical contact with the antenna base. Remove the adhesive at the center so that the aluminum tapes all contact each other. - installation - follow the a/c body, or flat Doesn't matter too much. - how critical is the above (loss of signal strength?) Keep it away from other antennae. |
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