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Originally Posted by sprjenkins
lol, radar detectors are passive units and don't emit any signal, they are simply recievers. There for they can't be detected with anything other than a Mark one eyeball. LOL, love some of the crap that's made up on the internet
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You might want be wrong here, to my knowledge a radar detector is like all receivers, they use what is called hetrodyning to modulate the on-air frequency with another to create a third lower frequency (i.e. 8.125 mixed with 8.000 gives .125). It is this modulated lower frequency that is 'detected". To get the "8.000" the unit has it's own in built oscillator, it is this internal oscillator that the detector-detectors can pick up as it is radiating (be it awfully low level) but is still itself capable of being found by sensitive devices. In fact the frequencies of the radar is quite high, it usually takes two or more of these intermediate frequency (IF) mixes to get down to the actually usable frequency for detection (super-hetrodyning), every IF has it's own local oscilalator that radiates. If you have ever placed a radio next to a computer you might have noticed a slight interference, the same basic thing is going on. In fact it is this interference where the law makers sometimes legislate the banning of devices as you are basically transmitting a radio frequency unlicenced.
I have been out of the RF world for quite some time and might be wrong here, but there is no such thing as a passive radio device (except maybe the old 1900 crystal sets).
Barry