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#12
February 20th 09, 03:00 PM
posted to rec.aviation.soaring
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Transponder Antenna & Battery Placement Nimbus or DUO
A transponder, such as the Trig Avionics TT21, that has the operating panel
separate from the transmitter/receiver box, will allow the transmitter/receiver to be installed behind the pilot and thus considerably reduce the required cable length (and hence losses) to a tail-fin antenna. At 03:10 20 February 2009, Gary Emerson wrote: Andy wrote: This is interesting as it will probably require some large coax to keep the antenna loss to less than 1.5 db which is what was recommended in the microair transponder install manual I have. The RG-58 is limited to 10 ft of coax length and that sure isn't going to get you to the fin from the instrument panel... 
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