OT-Moto

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The Motorola 16 pin accessory connector can provide all of the signals necessary to interface to an OT product, including providing enough current to power the unit.

Motorola 16 pin accessory port connection diagram

Some Motorola radios have other pins as programmable options beyond what this diagram shows. All radios I have run across so far have been able to be programmed to match the pin out provided. I have successfully interfaced to Radius SM-50, Radius SM-120, and Radius M1225 units. I have provided a COR signal connection, although I run the RX audio output on pin 11 in an unsquelched mode, providing live audio 100% of the time, and set the OT2 for software carrier detect.

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