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Don't confused transmitted radar frequencies with the downconversion oscillator frequencies used by the radar detector. They are related, but not the same. Non-radar example: 1 GHz transmitted signal. Receiver has a 900 MHz local oscillator. The signal is mixed down (AKA downconverted) to 100 MHz for further processing. A sensitive receiver located near your reciever, tuned to 900 MHz, would know of your receiver's existence.
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Jim R.
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