Icom Marine Single Pin M25 & M93
01 November 2015
This wiring plan is for Icom Marine radios with a single 3.5mm threaded socket.
3.5mm Pin with screw locking thread.
Gnd.
Common Ground for Mic, Speaker and Mic
Mic & PTT
Electret Mics connect here. When the Mic is connected via a PTT switch to Ground the radio transmits. (Mic and PTT are in series).
EXT DET
Ground this pin for headset use. Routes the RX audio to the headset. The front Mic and radio PTT will still work as normal.
Spk
Speaker Out
Icom M25, M93D and M73.
Buy here: Part Number CURLY-Y-AIR
