Microphone Information.

E F Johnson Microphone Pin Outs.
For: Messenger 250.

12 CL5-M
with Locking Ring
connector 1PTT (connect to pin 4 for TX)
2Speaker Ground
(Connect to Case during RX for speaker)
3RX (connect to pin 4 for RX)
4PTT / RX Common
5Mic Audio
CaseMic Audio Ground

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