Quote:
Originally Posted by MSD
Good thing it's non-ionizing radiation, which means all you have to do is move if you start feeling warm.
I know it's not as simple to deal with a frequency hopping system, but for under $10 I can build you a transmitter the size of a deck of cards that operates off 3 AA batteries and will silence the FM Radio spectrum within a radius of about 20-30 feet. If cell phones in prison are such a serious problem, they can invest a few hundred thousand dollars in a large number of short-range jamming units and put them in. Or, they can get a few EMF meters calibrated to GSM and CDMA bands and either walk around with them or install them in fixed positions.
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a single frequency transmitter is not enough to effectively jam a cell phone signal.
Problem 1: CDMA is too resistant to jamming. I can't explain this enough. CDMA broadcasts on such a wide band that any rf detector trying to pick up a CDMA signal will not distinguish it from background noise. It would look like an elevated noise floor. Since a broadband jammer puts out white noise, a CDMA phone and tower would have no problem filtering through it. Btw, good luck trying to power a 1.9 - 2.1 ghz jammer with a 4.5v power source.
Problem 2: while there are 3 gsm bands licensed by the FCC, each band holds approx 250 channels. Provided you do find what frequency the paging channel is operating on, once the carrier discovers that it's being actively jammed, they'll change the frequency of that paging channel. It'll be an endless cat and mouse game until you're slapped with an injunction to stop intefering with their operations. And good luck trying to power an 850 or 1900 MHz signal with only 4.5 volts of power.