>
> > 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.

Except that the radar dosen't emit pulses.
It emits a constant carrier, and the receiver is a homodyne.
The reflected carrier is doppler shifted a few 10's of Hz, and the output
of the receiver (actually a diode) is the doppler product.
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