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Gary Watson : The easiest way to do this is to purloin the schematic of one of the : transponder ramp testers as they all show altitude and mode A. The IFR 600 : is a bit complex but some of the simpler units could probably be cloned : without too much trouble. The RF portion could be removed from an older : transponder that has bit the dust, mainly because the cavity has died in the : transmitter, the receiver should still work and could provide the decoded : pulse train.Use the decoding from the ramp checker. this will give you a : portable unit to put in any aircraft. : Gary Watson Be mindful that the receiver needs to be on 1090, not 1060. Donno if most cavities will tune that far. And it needs to be set to fixed sensitivity. Your retuned tpx receiver would pick up folks for miles around. Having had both a Genave PWI, a device that lights a red light when someone is squaking nearby, and a TCAD, which differentiates on altitude, Id guess the monroy unit is quite excellent. It has a fixed 1500 foot filter, as I remember. Must figure out your altitude from that REALLY loud transponder. Trouble with the ones that only respond to strength is that they respond also to 5 mi UP too, and airliners set them off all the time. At night, you can sometimes find who is doing it. Just too many false alarms to be real useful. The Monroy is reasonably priced and losing altitude differentiation for 1/2 price would be a bad tradeoff. So some altitude differentiation is very useful. Bill Hale : "Bill Hale" : news:8rvul7$dm7$1@fcnews.fc.hp.com... :> Diego Castano :> : Folks, :> :> : I would like to build a transponder receiver (4096 C mode). Does : anyone :> : know how? :> |
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