Compatible to Motorola M(1) style 2 pin connector, although that connector using mono jacks.
3.5mm jack
Signal | |
---|---|
Tip | SPK- (Vcm = 2.5V) |
Ring | internal 10K PU to 3V3, unknown purpose
Short circuited to sleeve when using the SSM-17B Hand speaker Mic. Maybe that's the reason why Yaesu doesn't market the SSM-17B as an accessory to the FT-65. The SSM-512B is advised instead. |
Sleeve | SPK+ (Vcm = 2.5V) |
2.5mm jack
Signal | |
---|---|
Tip |
|
Ring | RX/TX
Short circuited to sleeve when using the SSM-17B Hand speaker Mic.
Use open drain TX and connect it to RX. Another option is to connect the anode of a diode to the RX-line. Connect the cathode of that same diode to the TX-line. |
Sleeve | GND |
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