How a Radar Jammer Can Be Made At Home

This is an example of a finished radar jammer

This is an example of a finished radar jammer
This is an example of a finished radar jammer


Most road users wanting to make better time on the open road will arm themselves with an expensive radar detector. However this gadget will not work against a gun type radar unit in which the radar signal is not present until the highway patrol has your automobile in his sights and pulls the trigger. Then it is too late to slow down.

A better way to safely make better time is to continuously jam any signal with a radar signal of your own. When tested with the help of a local police officer, her device displayed random numbers when I was driving towards her. Building a low power radar transmitter is very simple.

What is a radar tranmitter?

When encased in the proper size resonator, a special semiconductor named a Gunn diode will transmit microwaves when hooked up to 5 to 10 voltdc. This voltage can be sourced in-car by using an 8 to 3 terminal regulator. These regulators can be picked up at almost any auto-electrical shop.

Patrol officer radars usually operate on the K band at 22 GHz. or more often than not on the X band at 10.525 GHz. Pretty much allĀ  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 radar jammers. If you can't get any in your area write to Microwave Associates in Burlington, Mass. and ask for info on "Gunnplexers" for ham radio use. The finished jammer can be mounted outside the automobile in a waterproof enclosure, or on the dash. When on the open road, switch on the power.

How to test your unit

Correct construction and fine tuning your radar jammer can be difficult, if not in the possession of good measuring equipment for microwaves. One simple way to test your unit is to use a conventional ratar detector, preferably one that indicates which band the radar is transmitting on.

Interesting side-effects

Radar behind the automobile, or to the side, will not be jammed, so be careful when passing speed traps regardless. 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. Their detectors are being triggered by the signal your jammer is transmitting, bouncing off objects.


Many people go through the hassle to legally beat speeding tickets and pour thousands of dollars into fines and fighting them. Why not just build this little device and avoid them all together.

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Comments 10 comments

paul jones 6 years ago

ok, sounds great! but how do i go about building it? i would like to build a sweepable jammer so that i can adjust the frequencey range that it jams/transmits. any ideas?

johnsams profile image

johnsams 6 years ago Author

Hi Paul, I am not sure about the sweepable jammer, but you may be able to find more info on this website cheers!

Tom 4 years ago

This is not what i what

Dave 4 years ago

Ok so... where are the plans to build this????

CarNoobz profile image

CarNoobz 3 years ago from USA

Haha! That's cool. Voted up

Camel Toker 2 years ago

Exposure to Microwave Radiation is worse than a speeding ticket. So, choose wisely.

Johnf378 2 years ago

This will be a fantastic site, will you be interested in doing an interview regarding just how you designed it? If so email me! edabeeddbeek

Hack 23 months ago

No, that is an example of a gun diode with wires. Any digital gun will ignore that.

drake 10 months ago

just saw this same post on the dark web

DeeAda04 5 months ago

Camel Toker, spoken like a true idiot

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