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Maestro PTT on Mic 2 not working?

N7CXI
N7CXI Member ✭✭
edited April 2019 in Maestro
I bought a used Maestro, and just wired up a W2EHY electret desk mic to it using a 3-conductor 3.5mm plug.

I turned the BIAS switch on and the TX audio is fine, but the PTT doesn't work. The PTT switch is connected to the "ring" of the plug and tests fine with a meter, but when plugged in the switch won't key the rig.

Is there anything I should check, or does it sound like PTT on the Maestro Mic 2 connector may be broken?

Thanks,
Jim N7CXI

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