"Bill Kearney" wrote in message
...
There are detectors out there that also transmit a jamming signal. As
they
pollute the airwaves for the rest of us that use passive detectors, their
use is frowned upon.

Frowned upon? Uh, try illegal and use of them is a federal crime. No
thanks.


No federal crime if it is not an active transmitter. Some states, mine is
one, ban the passive jammers.
http://www.jammersstore.com/p_c450.htm
Basically they add a noise signal to the reflected radar energy.