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Date: 2013-12-08 10:35 pm (UTC)Okay, here's a thought, also from my ham radio days. Receivers emit RF. Badly designed receivers can emit a lot of it. The same is true for audio amplifiers. Someone's radio receiver is picking up FM radio signals, amping them up, and somewhere in the process rebroadcasting the formerly FM signal as AM.
One culprit could be a PA system at a gas station or some other business, which plays local radio stations when they're not making announcements. Lots of wiring there to serve as a transmitting antenna. You could even be getting more than one of these at a time.
This would only be noticed by someone working with sensitive equipment, which you are.
Is the interference constant, only during some part of the day, or what?