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CM200 No Tx

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Premium Subscriber
May 5, 2010
I have a Motorola CM200 that beeps when attempting to transmit. The radio powers up fine and otherwise operates fine. The radio slightly dims when keying up the mic and then beeps 3 times exactly like the CP200 low battery beeps. The radio will immediately stop transmitting but does not power off, just resets and allows the user to try and transmit again.

A new power supply was recently installed on this unit because it operates as a base radio. The previous power supply was destroyed during a power surge.

Does this sound like a programming error or a radio or power supply problem. I plan on trying a different power supply as soon as I can get my hands on one.


I ♥ Ø
Jul 27, 2005
Really sounds like a power supply issue, especially with the display dimming.

What power supply is it? Specifically, how much current does it supply? Sounds like it isn't big enough for what you need. Could also be that the voltage is set low. When the radio keys up, it draws enough power to strain the power supply and drop the voltage.

For a 50 watt radio, you really need at minimum a 15 amp power supply. Anything less will behave like you are saying.
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