>The in the state of Virginia it is illegal to have a radar detector - they
>must emit some radiation, because the police are capable of identifying
cars
>with radar detectors operating.

>>No.  A radar detector is just a receiver.  The radar emits a pulse which
>>bounces off the target and back to the radar receiver.  A radar detector
>>receives the signal at the target, before the bounce.


The problem with diode detectors is that part of the rectifying process will
generate signals that will definitely be re-radiated, if not at the
fundamental then at a harmonic and these can be detected. The only way to
stop this is to use a circulator or some other form of coupler, and these
then are a lossy component in the path reducing the sensitivity of the
detector.

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