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Originally posted by violet
I had a sound coming from one of my TV's, but this isn't the sound I heard. Mine was a constant high pitched sound and very annoying. I couldn't really tell what was causing it, so I just unplugged all the equipment, and it stopped. I have satelite and cable, but I thought I'd determined it was the satelite receiver, because when I put my ear to that it seemed to be coming right out of the unit, although unplugging each unit seperately didn't solve the noise issue. It began a few months ago. I can finally plug it all back in now and the sound is gone.
[edit on 5-6-2008 by violet]
Originally posted by nataylor
It's called GSM buzz. It's generated by the GSM radio in cell phones (in the US, AT&T and T-Mobile use GSM radios). By he nature of the technology, the radio switches on and off 217 times per second. This induces a current in the wires of poorly shielded electronics. In devices with speakers, the induced current produces a "buzz" at 217Hz, which is in the audible range. It has nothing to do with being an "FM" signal. It'll will happen on any poorly shielded speaker whether it has a radio receiver or not.
There's nothing mysterious or conspiratorial here.
Originally posted by Illahee
Now ask yourself why your phone does this about every 15 minutes even when you don't get a call.
The FBI appears to have begun using a novel form of electronic surveillance in criminal investigations: remotely activating a mobile phone's microphone and using it to eavesdrop on nearby conversations.
Kaplan's opinion said that the eavesdropping technique "functioned whether the phone was powered on or off." Some handsets can't be fully powered down without removing the battery; for instance, some Nokia models will wake up when turned off if an alarm is set.
"They can be remotely accessed and made to transmit room audio all the time," he [counter-surveillance consultant James Atkinson] said. "You can do that without having physical access to the phone."