Jamming does not make you invisible to radar, it just overwhelms the reciever on the radar unit with enough RF noise that it cannot resolve the phase shift in the return signal and therefore detect the speed accurately. If the speed radar is transmitting at 1 watt, the return signal is miniscule, like microwatts. If you transmit 4000 watts of Raytheon radar at the speed radar, it cannot detect it's own signal coming back, it's just lost in the clutter.
You can jam speed reading laser (LIDAR) basically the same way, just at shorter wavelengths, for a lot less money, and without breaking any FCC laws. My recollection is that LIDAR oerates at 904 nm and that high power (relatively speeaking) LEDs at this wavelength are easy and cheap to buy.
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