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Thread Tools | Display Modes |
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#1
September 12th 11, 04:54 AM
posted to rec.aviation.soaring
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Transponder: Mode-C or Mode-S?
I recently bought a new bird and need to put a transponder in it. The
choice was obvious (until I took a closer look). Trig TT21 seems like a great choice: small footprint, built-in encoder, 1090ES ADS-B out, and descent price. However a bit more looking revealed more questions than answers. It seems it requires an ISO GPS and one could not use typical GPS sources we have in gliders, it is not clear if the ADS-B out work with PowerFLARM (at least from what I have heard), and the biannual testing cost 2-3x as much as mode-C. Any thoughts/suggestions from more knowledgable folks? Cheers, Morteza 
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