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I work part time with the Saint Anthony PD... I have done numerous ride alongs, and when using a traditional radar, you can just flip it on and off, and still get a lock reading with a tone...
A tone is received (doppler effect) to measure the strength and reliability of the reading. Usually the radar is tuned every night before a shift, or every 24 hours using a pitch fork. The fork is struck, and placed in front of the transciever, usually there are 2-4 (front/rear... State patrol also has left/right). An officer could flip it on for just a split second, and if you're within 1/4 mile, and you're the fastest, closest, or biggest target... you're fucked and you won't even know it... A good tone takes about 1/4 of a second to receive. Try it sometime. If you're driving, and you see the parking lights, you may not kick a signal til your close, or you may only kick it for a second. The most common signals and tones are K and Ka, sometimes X. The same technology is also used on automatic doors at department stores. Not to mention if an officer can obviously see you're speeding, and he is either a prick, or has an onboard cam, he can give you a general speeding ticket... (Tom)
These things are only good if you're in light to moderate traffic, and the cop is country, and leaves his radar on all the time... Not likely though.
:rally:
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