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Old 09-02-2010, 07:06 PM
 
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Someone told me that the detectors are coded and the codes are changed frequently. This would make it difficult to use one of them to change the signals. I do not know of any law prohibiting radar detectors in passenger cars but many states prohibit their use in commercial vehicles.
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Old 09-02-2010, 08:03 PM
 
Location: U.S.A.
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Originally Posted by pvande55 View Post
Someone told me that the detectors are coded and the codes are changed frequently. This would make it difficult to use one of them to change the signals. I do not know of any law prohibiting radar detectors in passenger cars but many states prohibit their use in commercial vehicles.
The home built device uses a resistor-capacitor (RC) circuit to set a frequency. The resistor used is a potentiometer meaning that the resistance can be changed with a screw driver which in turn means the pulse frequency can be tuned the same way. With all the time sitting at these lights the device can infinitely scan through a frequency band in seconds until the magic number is hit.
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