Motorola CDM – No PL/DPL on TX from External Accessory Connector

If you’re trying to interface an external accessory (like a Signalink) to a Motorola CDM via the rear 20-pin connector, and it’s not transmitting PL:  Go to “Radio Configuration,” then “Accessory,” then change “Data PTT Audio Source” to “Ext Mic Audio” – if it’s set to “Flat Tx Audio,” the radio will not send PL or DPL.

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