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Originally Posted by QuasiMondo
The problem is that cell phone technologies don't rely on a single transmit and recieve frequency. You'd have to either buy multiple jammers for each frequency or one jammer powerful enough to block out a block of frequencies. The problem with the former is the unintended harmonics that are generated will cause inteference. The latter will knock damn near everything off the air. And something that powerful you don't want to be in the vicinity of.
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Good thing it's non-ionizing radiation, which means all you have to do is move if you start feeling warm.
Quote:
Originally Posted by QuasiMondo
CDMA is a different animal. It's developmed from frequency hopping technology pioneered in WW2 that was designed to circumvent enemy jamming techniques. CDMA is difficult to jam because those six CDMA bands that the FCC licenses out is between 25 and 60 MHz wide and that signal uses all of that single band to transmit. To jam a CDMA signal, you'd have to jam the entire band that it operates on.
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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.