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The average distance speed readings are taken, is a half a mile, meaning the X-Band radar can be detected long before the police officer can get an accurate speed reading. X-Band operates at about 10.525 GHz X-Band is the easiest type of radar wave to detect, and in some cases, X-Band radar can be detected as far away as four miles.
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The second type of radar was X-Band radar detection which was a relatively low-frequency high-power radar used primarily in New Jersey and Ohio. The first police radars emitted a constant stream of pulses, allowing for much easier detection, but later models implemented an “instant on” mode, making it much more difficult for those with radar detectors to receive a signal and slow down prior to being “nabbed.” The Doppler effect is caused by the motion of the wave source or an object the waves bounce off of. Police radar is based on the Doppler effect when the police officer targets a vehicle with his or her radar gun, the speed of the vehicle results in a tiny shift in the reflection’s frequency as compared to the original beam. The first radar units used vacuum tubes and were very bulky, transmitting S-Band at 2.45 GHz, which is very close to today’s microwave ovens. Radar (Radio Detection and Ranging) works by using microwaves and has been in use since the early 1950’s, going through multiple generations throughout the years. Understanding Police Radar Used in Speed Detection