It just doesn't take much to pick up an AM modulated signal, which is probably what you're hearing. I used to get very faint whispering out of my computer speakers even. It totally freaked me out the first time I heard it late one night! Thought I was hearing voice in my head again! Doc said I was cured though, so I looked for other possibilities.
wireless headphones picking up phones conversations, radio
I have a set of Sennheiser 900 MHz wireless headphones. When I turn off the source to the transmitter I can pick up all sorts of signals. Radio, telephone and who knows what. I can't identify some of the stations. 
I just though that this was odd. With the source turned on the signal is clear and distinct and no interference. (which is good). I have set the tuning range of the transmitter to the 3 different ranges with the same effect.
I can understand the 900 Mhz telephone interference but what about all the other RF crap?
John
I just though that this was odd. With the source turned on the signal is clear and distinct and no interference. (which is good). I have set the tuning range of the transmitter to the 3 different ranges with the same effect.
I can understand the 900 Mhz telephone interference but what about all the other RF crap?
John
