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A primary pace gun is just a radio transmitter and receiver mixed into one unit. When the radar gun and the automobile are each standing nonetheless, the echo could have the identical wave frequency as the original signal. The receiver in a radio is designed to choose up alerts in the AM and FM frequency spectrum, whereas the receiver in a radar detector is tuned to the frequency range utilized by police radar guns. The air is filled with radio indicators -- they're used for all the things from tv broadcasts to garage door openers -- so for a receiver to be in any respect helpful, it must pick up solely alerts in a certain vary. For example, if the police car is going 50 miles per hour and the gun detects that the goal is shifting away at 20 miles per hour, the target have to be driving at 70 miles per hour. tp.st |
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发表于 2024-11-11 01:36:43