Matt, from the beta firmware download page:
?
Microphone Connection:
The microphone is plugged into the QMX Paddle port; this stereo 3.5mm jack plug is for both the microphone signal AND the PTT switch.?
- Ring-to-ground is the microphone connection
- Tip-to-ground is for PTT (close the connection tip-to-ground to initiate transmiussion)
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73, Dan - W2DLC
Daniel Conklin