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Old September 18th 04, 02:22 PM
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Doug Vetter wrote:
: Transponder reception problems are usually caused by being off-frequency
: or a/c gate misalignment. The older units really do drift over
: time...hence the importance of the 2 year check. A simple test at your
: avionics shop can reveal what's wrong, and chances are it just needs an
: adjustment.

Oh, I forgot to mention that might be applicable for someone who knows more
about adjusting these things. You mentioned a/c gate misalignment and that jogged my
memory on this thing. The "reply" light has always been a bit flaky on this box.
When it's receiving a signal, it's always done a quick, multiple flash... pretty much
at every interrogation. It doesn't just pulse once every few seconds like it
should... always blink-blink-blink-pause-blink-blink-blink-blink-pause....

Certainly sounds like it could be some digital timing gone awry and it's just
"marginally worked" before.

What say you (all)?

-Cory

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* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
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