163 lines
8.1 KiB
Plaintext
163 lines
8.1 KiB
Plaintext
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:::::::::::::::::::::::::::::::::::::::
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<20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD>
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774-2035
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:::::::::::::> <20>RESENTS <::::::::::::::
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<20>ADAR <20>AMMING: <20>OTORISTS <20>IGHT <20>ACK!
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<EFBFBD>RITTEN BY THE <20>CARLET <20>RMADILLO
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<EFBFBD>LEASE DO NOT POST WITHOUT THE ABOVE LINES OR <20> BE ALL DEPRESSED!
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<EFBFBD>ARNING: <20>HE KNOWLEDGE OF THIS IS NOT ILLEGAL, BUT THE OPERATION OF A RADAR
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JAMMER WILL PUT YOU IN VIOLATION OF SEVERAL <20><><EFBFBD> REGULATIONS AND IF CAUGHT
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BY A POLICE RADAR UNIT,
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:::::::::::::::::::::::::::::::::::::::
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THE GREEK INN
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774-2035
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:::::::::::::> Presents <::::::::::::::
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Radar Jamming: Motorists Fight Back!
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Written by the Scarlet Armadillo
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Please do not post without the above lines or I be all depressed!
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Warning: The knowledge of this is not illegal, but the operation of a radar
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jammer will put you in violation of several FCC regulations and if caught
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by a police radar unit, you can be charged with obstruction of justice, a nasty
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offence. But frankly, who gives a flying fiddlers fuck!
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_______________________________________________________________________________
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Principle of Radar Jamming:
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Police radar operates by simply sending out a signal of a known frequency and
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the receiving of a reflected signal. When the signal is reflected off a car,
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the frequency is shifted due to the doppler effect. This frequency shift is
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then picked up by the police unit, and within a few minutes you are giving the
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cop your license, $50, or taking a breath test!
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To jam that unit, we will emply a microwave source that will "fool" the police
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unit. By switching this circuit on and off, pulses are produced in the police
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unit that are roughly equivalent to the pulses that are produced by the
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detection of your car.
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In order to produce the desired speed reading on the radar unit, we must pulse
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at a rate equal to the frequency of the police unit. The rates are 31.4hz
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(pulse per second) per MPH of speed on the "x" band and 72hz on the "k" band.
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thus for a speed of 45 mph the police unit must receive a signal of frequency
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45 mph * 31.4hz or 1413hz on the x band and 45 mph * 72hz or 3240hz on the k
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band. The good thing about this is if the police ever change their radar to go
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to another band, all you would have to do is change the circuitry to match
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their frequency.
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_______________________________________________________________________________
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Circuit Operation:
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This jamming unit can work in one of two modes: manual and automatic. In manual
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mode you would have the unit send out a constant signal of the correct
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frequency for the nice officer to pick you up at the correct frequency. The cop
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will pick you up at the speed you want him to see. It doesn't matter what you
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are doing. Though if you set the jammer to send out a signal equivalent to 20
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mph and you where flying down the highway at 75 mph and passed by a radar unit,
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ole smokey may suspect something. Though as long as he doesnt find the jammer
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in your car he can't prove diddly shit in court.
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The other mode is the automatic mode. In this mode, you send him a fraction of
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the speed you are traveling at. If you set it at 75% and you are travelling at
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70 mph, the cop will get a signal equivalent to 53 mph. This is the best mode
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because what if you turn off the interstate in manual mode set at 55 mph and go
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down a 30 mph street! You will get pulled over for doing 55 mph when you were
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only doing 30 mph. (But officer, I forgot to turn off my radar jammer!) The
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problem with this mode is that the jammer can't just look at your speedometer
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to see what speed you are driving at, it must receive a signal from a wheel or
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axleshaft pulser.
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_______________________________________________________________________________
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Technical Description of the Unit.
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Since a technical description of this unit is very difficult since it is quite
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complex, I will try to go into the manual mode operation and just paraphrase
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the automatic operation.
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You use a 555 timer to make a master pulse train. Tie 8 & 4 to v+, 1 to ground,
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small (.01uf) cap from ground to 6, short 2 to 6, then a resistor from v+ to 7,
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and a variable resistor from 7 to 6. That variable resistance will adjust the
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frequency. The output signal is at pin 3. Now take that signal, split it up and
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divide it by 23 and 10. To divide by 23, use 2 4522 programable divide by n
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counter, c all then ic-1 and ic-2. Tie pin 3 from 555 timer to pin 6 of ic-1.
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Ground 14,10,2,4 of ic-1 and 5,14,2,10,4 of ic-2. v+ and ground also go to the
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proper pins to power the chips. Tie 5 & 11 of ic-1 to 11 & 13 of ic-2. They
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form one common node, that you will then connect to v+. Then tie 3,12 of ic-1
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to pin 3 of ic-2. Tie pin 1 of ic-1 to pin 6 of ic-2. The outputs of this
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divide by 23 counter is pin 13 of ic-1 and 12 of ic-2 which are tied together.
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In a similar fashion, divide the signal coming out of the 555 by 10. Take the
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divided by 10 signal and then divide that guy by 72 in a similar fashion as the
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divide by 23 circuit. Call the two chips this time ic-3 & 4. Tie pins 5,2,10,4
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of ic-3 and pins 14,2,10,4 of ic-4 to ground. Then tie pins 11,14 of ic-3 and
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5,11,13 of ic-4 to v+. Tie pin 3 to pin 3 to pin 12 of ic-1, then pin 1 of ic-3
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to pin 6 of ic-4. The outputs are 13 of ic-4 and 12 of ic-4. This signal you
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might want to take to another circuit to display the speed you are travelling
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at. You need 4521 connected to a 4511. the 4511 is a bcd to 7 segment display.
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The seven segment output is connected to two 7 segment LED assortment. Pins 1
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and 2 from the 4521 will determine which 7 seg. is sent the proper information.
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Now take the divided by 23 signal and take it to one input of a 4 input AND
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gate. Then take the divided by 10 output to another and gate. Take the divided
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by 72 output and take that to an input on both AND gates.
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Option: If you have a radar detector, make up a circuit to output 5 volts for,
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let's say about 20 seconds when it goes off. Consider the radar detector a
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trigger input to a 555 timer with and rc combo tied to pin 6 and 7. a good r is
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1m ohms and a good c is 20uf. This is a time constant of 20 seconds. Then tie
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the output, pin 3 of 555 to an input on both and gates. This will cause a 20
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second jamming signal whenever the radar detector goes off.
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The outputs of the and gates are taken to simple amplifiers which in turn are
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take to the gunn diodes which are sent to the proper antenna.
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You need two different gunn diode oscillators for x and k band. For the x band
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use microwave associates part ma 86651-d or general electric part c 2070-j. For
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the k band use either ma 86791 or ge c1238-a. It is sometimes possible that at
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short ranges, the police radar may have more power than your signal. In that
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case, you may want to use two gunn diodes for each band. Then you need
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antennas. For x band use ma 86551 and for k use ma 86552. For increased power,
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you will need two of these each also.
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The desctription of the automatic mode is all but impossible in a text file,
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sorry!
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All this sounds great right? You are probably running out to radio schlack now
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to get the parts right? Well, with all good news comes bad news. The bad news
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is price. You are going to need over 30 different ic's which will make for
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complication and price problems. The killer though are the gunn diodes. The
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1983 prices on the gunn diodes and antennas are:
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ma 86551 $15.00 (x band antenna)
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ma 86552 $29.00 (k " " " ")
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ma 86651-d $116 (x band gunn diode)
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ma 86791 $125.00 (k " " " " " ")
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Thus if you want the high power jammer you are looking at $575 for the
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transmitting equipment alone! That is not to mention all the other support
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hardware. The moral is, if you want to beat smokey, you have to pay for all of
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this. Your best bet rather then make this is to buy a simple radar detector. It
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has saved me dozens of times in 24 months.
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For more a 20+ page manual on how to make this jammer in detail, send $4.00 to
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cover postage and handling to:
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Scarlet Armadillo
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P.O. Box 1053
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Park Ridge, IL 60068
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Leave me E-mail at any big Chicago board or the Greek Inn.
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hkn (!)
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