Question about Motorola Two Way Radio

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We have two motorola CDM1250 two-way radio installed in the same room .Seem to be getting feedback in one unit when the other unit mic is pressed. it does not happen when the other unit mic is pressed. At this stage have replaced both mic and the unit themselves without any success. Both radio units are programmed on different frequency with a 250khz bandwidth separations

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You might check your antenna locations, connections, coax and cables. Feedback is sometimes cause by two or more transmitters being too close together (or bad coax/connectors). In the case of mobile radios, this would depend on the location of the external antennas. One radio may be more sensitive than the other, or a PL (private line) code is blocking the interference on the radio which appears to not have a problem. Feedback is caused by RF (radio frequency waves) in the environment. We suggest looking for the leak, and/or repositioning the antennas to be futher apart.

Best regards.

Posted on Apr 08, 2011

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