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CM 300 won't transmit

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Premium Subscriber
Mar 13, 2010
North Carolina
We have a CM 300 that will not transmit. It was hooked to a PA amp inside our fire station via pins 7 and 11. All of a sudden this radio will not transmit. There is no internal speaker audio with pins 15 and 16 jumper-ed. When you key the mic it double beeps. It's not a low voltage issue with the power supply. I took the radio out to a truck, plugged it in and same thing. Even grounding pin 3 on the 16 pin does the same thing. Changing antennas makes no difference. I have the original code plug and wrote it to the radio. No change.

Radio was found with a broken wire to pin 11(but I do not thing it grounded anything), i'm not sure if this is related or not.

Any help is greatly appreciated!
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