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How common is it for QRM to interfere with aviation radio, whether from multiple operators transmitting simultaneously, from an unlicensed transmitter, or from sources other than air band radios?

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In my experience it is primarily “doubling up” where two stations start transmitting at once and step on each other. This happens quite regularly, in my area it would certainly be a daily occurrence. It’s generally not a problem. One of the advantages of AM is that it’s easy for a listening station to tell when two stations have talked simultaneously, whereas the “capture effect” of FM detection makes that harder to discern.

In 30+ years I have very rarely ever encountered other RF interference, (maybe once or twice?) and have never encountered nuisance transmissions.

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