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Most drivers wanting to make better time on the open road will arm themselves with an expensive radar detector However this device will not work against a gun type radar unit in which the radar signal is not present until the cop has your car in his sights and pulls the trigger Then it is too late to slow down A better method is to continously jam any signal with a radar signal of your own I have tested this idea with the cooperation of a local cop and found that his unit reads random numbers when your car approaches him It is suprisingly easy to make a low power radar transmitter A nifty little semiconductor called a Gunn diode will generate microwaves when supplied with 5 to 10 vdc and enclosed in the correct size cavity resonator A 3 terminal regulatoravailable at Radio Shack can be used to get this voltage from a cars system However the correct construction and tuning of the cavity is difficult without good microwave measurement equipment Police radars commonly operate on the K band at 22 ghz or more often on the X band at 10525 ghz Most microwave intruder alarms and motion detectors mounted over automatic doors in supermarkets etc contain a Gunn type transmitterreceiver combination that transmits about 10 milliwatts at 10525 ghz These units work perfectly as jammers If you cant get any locally write to Microwave Associates in Burlington Mass and ask for info on Gunnplexers for ham radio use When you get the unit it may be mounted in a plastic box on the dash or in a weatherproof enclosure behind the plastic grille Switch on the power when on the open highway The unit will not jam radar to the side or behind the car so dont go speeding past the radar trap An interesting phenomena you will notice is that drivers in front
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