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 you car in his sights and pull the
trigger. Then it is too late to slow down.
A better method is to continuously 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
approached him. It is surprisingly 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). An 8 to 3 terminal regulator can
be used to get this voltage from a car's 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 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 units work perfectly as jammers. If you can't
get one 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 of behind the car so don't go speeding past the radar trap.
An interesting phenomena you will notice is that drivers in front of
you who are using detectors will hit their brakes as you approach
large metal signs or bridges. Your signal is bouncing off these
objects and triggering their detectors.
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