GMA340 Intercom/PTT

Hey all,

I got working on wiring up my intercom with a GMA340. When I plug the headphones in I hear audio no issue, and when I plug the mic in the mic jack I can hear myself on the intercom just fine. I have an old PTT similar to https://www.aircraftspruce.com/catalog/avpages/ptt_switch2.php?clickkey=997456

When I plug it in, the intercom goes away. When I key the mic, it sounds like it pushes out though. I wired it as per the explanation for microphone in the second image. I used a shielded 3 wire to connect the mic with the barrel to pin 35, the ring to pin 33, and the tip to pin 34. Did I wire the mic jack correctly? I’m trying to find out why when I plug the PTT switch into the mic jack I would lose intercom. This particular PTT switch came from a portable intercom. I assume they all work similarly but maybe not?

Thanks!

Not sure why you?re using a portable PTT instead of a stick mounted, but, if you read the David Clark notes for that PTT, it states that it also switches the mic audio. That is probably your issue.

It was really only for testing, to make sure I had it wired correctly. It would seem that I do. Thanks!