BNC- Antenna socket
MIC- External microphone and PTT. For better performance, use an external MIC.
Note: Always turn off the power before plugging in the external MIC.
The tip is MIC, the narrow ring is PTT, and the inner conductor is GND.
AF GAIN- Volume control. Turn clockwise to increase volume.
TUNE- Frequency tuning knob/Tuning rate selector. Turning clockwise is frequency up,
turning counter-clockwise is frequency down. Press the knob to select the tuning rate. The
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