> does a radar detector emit anything?  I can't see why it
> needs to, to 'detect' a police speed radar machine....?


Simple diode type detectors don't have to.
As soon as you use superheterodyne or any "tuned radio frequency" principals
which utilise signal frequency oscillations then there will be some leakage
which can be detected. Due to the relatively simple nature of many such
designs the control of spurious emissions is liable to be poorer than in
more conventional receivers.



    RM

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