49 lines
3.0 KiB
Plaintext
49 lines
3.0 KiB
Plaintext
file ()1 out of ()6
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[] uNDERGR()UD tECHN()L()GIES mAGAZINE UK []
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[] volume 1, issue 1 jULY 1994 []
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Highway radar jamming by The Jolly Roger
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Most drivers wanting to make better time on the open road will
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invest in one of those expensive radar detectors. However, this
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device will not work against a gun type radar unit in which the
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radar signal is not present until the cop has your car in his
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sights and pulls the trigger. Then it is TOO LATE for you to slow
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down. A better method is to continuously jam any signal with a
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radar signal of your own. I have tested this idea with the
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cooperation of a local cop and found that his unit reads random
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numbers when my car approached him. It is suprisingly easy to make
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a low power radar transmitter. A nifty little semiconductor called
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a Gunn Diode will generate microwaves when supplied with the 5 to
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10 volt DC and enclosed in the correct size cavity (resonater). An
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8 to 3 terminal regulator can be used to get this voltage from a
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car's 12v system. However, the correct construction and tuning of
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the cavity is difficult without good microwave measurement
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equipment. Police radars commonly operate on the K band at 22 ghz.
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Or more often on the X band at 10.525 ghz. most microwave intruder
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alarms and motion detectors (mounted over automatic doors in
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supermarkets & banks, etc.) contain a Gunn type
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transmitter/receiver combination that transmits about 10 kilowatts
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at 10.525 ghz. These units work perfectly as jammers. If you
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cannot get one locally, write to Microwave Associates in
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Burlington, Massachusettes and ask them for info on 'Gunnplexers'
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for ham radio use. When you get the unit it may be mounted in a
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plastic box on the dash or in a weather-proff enclosure behind the
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PLASTIC grille. Switch on the power when on an open highway. The
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unit will not jam radar to the side or behind the car so don't go
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speeding past the radar trap. An interesting phenomena you will
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notice is that the drivers who are in front of you who are using
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detectors will hit their brakes as you approach large metal signs
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and bridges. Your signal is bouncing off of these objects and
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triggering their radar detectors! HAVE FUN!
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-Jolly Roger-
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P.S. If you are interested in this sort of thing, get a copy of
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POPULAR COMMUNICATIONS. The ads in there tell you where you can
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get all kinds of info on all kinds of neat equipment for all kinds
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of neat things!
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--------------------------------------
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[to get a GUNN DIODE as mentioned above, get in touch with Cirkit distributation Ltd. on (0992) 441306 or just pick up their summer 1994 catalogue from WH Smiths
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(<28>1.90), the gunn diodes are on page 189 and cost about <20>20 - oPTICAL].
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