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I have a motorola AAM25KKD9AA2AN radio. When I key the microphone the radio powers off and when I release the microophone it powers back on. If I remove the antenna, it does not do this.

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Sounds like a power problem. Check your wiring and battery connections. Or if using this radio as a base station with a power supply, check your wiring and the power supply. You are likely not getting enough power to operate the radio.

By keying the mic without an antenna connected you are creating high VSWR which is hard on the radio. It reflects power back into the radio and pounds the power amplifier. The reason the radio is staying on is likely it takes less power without the antenna connected. While examining the radio, double check your antenna connections and coax.

Best regards.

Posted on Jun 03, 2010

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Make sure your antenna is matched. The radio may be shutting down do to a shorted coax or high SWR.

Posted on Feb 28, 2013

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