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Microphone Information.

E F Johnson Microphone Pin Outs.
For: 975x Series, 977x Series.

13 Pin ProprietaryPinSignal
connector 1Not Used
2Not Used
3Common Ground
4Volume
5Bootstrap (BTS_N) (for programming)
6Not Connected
7+12V DC (VPP) (for programming)
8+13.8V
9PTT (connect to pin 3 for TX)
10TX Data
11Mic Audio
12Hanger
13RX Data

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