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RE: ATC transponders

Hi Tony,

Just happened across this post. Having actually designed a transponder in the mid 70's I may have a warped view, but I don't recall any special VSWR requirements. In those days the outputs were integrated tube/cavity assemblies from GE or RCA and you just had to ground the cathode to squirt out a pulse.

Since the install has to be done by qualified people and since the transponder only emits pulses when interrogated it's hard to see a likely scenario where damage would occur since a broken aerial likely won't hear the interrogation.

That being said and sans any requirements I never tried it. Of course the only thing at risk was the cavity/oscillator assembly and they were easy to replace and not very spendy.

Just another viewpoint from the dim past...

Rick

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