Radios emitting constant hum?
I have a set of walkie-talkie radios that I keep stored in their charging base, the base is unplugged and the wire is coiled, there are no headsets attached to the radios, and they are always off, they are motorola 23-mile range radios, this information might be relevant, but here's where it gets weird. For two days one of them would emit a constant hum for about 2 minutes, then stop, then it would start again about 30 seconds later. The hum got slightly louder as you got closer, but seemed to be coming from everywhere, making it very hard to track down, . Remember, there was no power to either radio, and the power switches were off. Does anyone know how on earth this might have occured?Because this might make a fun prank if I can figure out how it happened