Improvised Radar Jammer

By: John Homes

A radar detector is most car drivers first acquisition when wishing to exceed the speed limit on the open road. A radar detector is ineffective against a highway patrol gun radar, where the cop pulls the trigger when your car is in their sights. It's then too late to reduce your speed.

Jamming any radar signal continuously from your own vehicle is a much better way. When tested with the help of a local patrol officer, her device displayed random numbers when I drove at her. It is surprisingly simple 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). There are many ways to gain this voltage in-car, an effective wayis to use an 8 to 3 terminal regulator. Without a good microwave measuring device, the correct tuning of your radar jammer can be difficult. Cop radars more often than not operate on the K band at 22 GHz. or more often than not on the X band at 10.525 GHz. Most microwave intruder alarms and motion detectors (mounted over automatic doors in supermarkets, etc.) contain a Gunn type transmitter/receiver combination that transmits about 10 milliwatts at 10.525 ghz.

These devices work perfectly as jammers. If you can't get any in your area send a letter to Microwave Associates in Burlington, Mass. and ask for info on "Gunnplexers" for ham radio use. The component may be mounted in a box made of plastic - on the dashboard, or alternatively it can be mounted externally, so long as it is in a weathproof enclosure. Power up the Jammer as soon as you get to the highway.

Usually, this gadget will not jam the police officer's detectors that face to the rear, or the side of the patrol vehicle. Something interesting to observe is that any vehicle in front of you fitted with a detector will hit their brakes as you come up to large flat objects. Your signal is bouncing off these flat surfaces and triggering their detectors.

Essentially, these little jammers are a fantastic way to beat a speeding ticket.

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