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I drove passed an undercover police car, my radar detector didn’t alert?

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I drove passed an undercover police car, my radar detector didn’t alert?

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Radar Detector’s work by alerting to frequencies transmitted by radar speed detection devices, if the car you drive past is not using a radar system, or it is not switched ON (WA uses Kustom K band 24.150Ghz) then there are no frequencies present there to picked up, it’s as simple as that! It is not often you will encounter a K band speed trap from a patrol car in the metro area, although sometimes cops will run radar instant on down busy highways or roads i.e. Guilford rd. is popular for this. The same rule applies to Laser Handheld gun’s, you can never receive an advanced alert from your radar detector from a police officer using a handheld gun as it is not constantly running, and even an alert when the officer targets your car is a hit and miss. Police handheld guns transmit a very narrow infrared light beam running on the legal light spectrum of 904nm. When a cop targets your car, he is primarily pointing at your license plate, as your radar detector is positioned on your dashboard

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