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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. :eek:

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
 

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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.
 

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AM! It never occured to me! Speaking of faint voices, that reminds of a prank we played in residence. We tapped into my room mates speakers and the guys next door would whisper single words once in a while in a deep voice into a mic. It was low enough that you could think it was in the hall but directed enough that he started to get the creeps.

It got to the point where he figured the sounds were coming from his speakers so he pulled the power plug in the system. He just about fainted as he held the end of the AC cable in his hand and the speakers spoke his name. :D

John
 
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