Radar Jamming

Yeah, I keep it next to my SAM battery.

Sure! It's called a Marx generator coupled to a parabolic reflector... also works well on automobiles with loud stereo systems and any other pesky electronics. ;)

I repaired a bunch of them when I was in the US Air Force.

If you want to jam radar guns, then I'm afraid you're pretty much on your own.

You could get a 1KW power inverter, and set an ordinary microwave oven on your dash with the door ripped off and the interlocks jury- rigged.

You can knock off the BS. I happen to know that radar jamming is VERY illegal "down under".

Plus we "professionals" don't just hand out potentially-harmful schematics to illiterates who can't spell or use proper grammar ;-)

...Jim Thompson

I understand a 30-06 is effective against photo radar ;-)

...Jim Thompson

-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | |

They've started pole installations around here... damned stupid if you ask me... in a state where virtually everyone is armed.

...Jim Thompson

Perhaps, but highly inadvisable if it's the manned type.

Best regards, Spehro Pefhany

Has anybody actually made a working radar jammer themself?

Hey, I kinda liked my idea. It's novel and just might work! :)

The technology behind "jamming" a radar signal is no small feat. From the sounds of it, you just want a schematic and plans to build a $10 way to get out of speeding tickets. Well, even if you had a schematic, you're still missing the hardware you need to make it. It's not a simple project, by any means. And when you try to place an order for microwave components, Big Brother is going to be watching.

I'd recommend you just not speed. It's much easier, sorry.

They are all frauds and do not work. This individual offers a $5000 reward for anyone who can make one:

No, but I've always fancied equipping a car with extensive ECM. ;-)

Graham

On the other hand, were he an illiterate that could spell and use proper grammar... ;-)

No, but I have thought about how you would make a spoofer.

You would have separate receive and transmit antennas. The receive antenna would be fed to a mixer. The other mixer input would be a Doppler shift frequency you generate according to vehicle speed (that is, it is the exact amount of Doppler shift you need to send your detected speed down to 0. Then you low pass filter the mixer output to select the lower sideband, and send the output of the low pass filter to the transmit antenna.

In reality, you probably couldn't design a low-pass filter with a sharp enough cutoff, so you would have to get the lower sideband some other way. The basic idea is to use a Single Side Band Suppressed Carrier type of modulation. I'm not a microwave guru, so I would have to go read up on this stuff a little more before I could say whether this would really work.

And it might be hard to provide sufficient isolation between the transmit and receive antennas. The system might run off chasing its tail if the transmit is allowed to feed back into the receive.

Anyway, it's easy to sketch a system out. The devil is in the details. ;-)

--Mac

Andy writes;

About 10 years ago, I was designing a 5.8 Ghz toll tag system for a European test. It used "reflective backscatter", which is caused by modulating the Radar Cross Section (RCS) with data and looking at the sidebands created on the return signal...... Since the RCS of a credit card size tag at 5.8 Ghz is very very small, I did used a patch receiving antenna (about 1 inch square) to an OOK switch, to a 30 db gain amp, to a transmitting antenna. All on the same credit card size substrate.I could get about 40 db antenna isolation so the thing didn't oacillate. It worked great, and could simulate several hundred square cm of modulated backscatter reflector...... \\

Since nothing was 'generated" and the illuminator signal was simply picked up, modulated, amplified and sent to a return antenna, there was no FCC or CE requirement.

It worked great.

But it occurred to me, why not use the same technique for a radar jammer. Whatever frequency hits the receive antenna is amplified and modulated with a 2V/lambda doppler OOK signal, and the radar gun would register a Volkswagen going at 250 mph, or some such, and NOTHING is transmitted until a radar gun signal hits the tag..... Seemed like a great idea.

I never tested it on a radar gun, but I am sure the technique is worth considering.....

If anyone wants a further discussion of the above, email me at snipped-for-privacy@juno.com

Good luck. I hope you aren't driving down a highway near me :>))))))

Andy

GEEEZZZZ!!!!!

i didn't know you yanks were soo woosy!!!! what happened to land of the free. I just wanted some info... possibly a schematic... its not ilegal down here in Aus, possibly it is to use it but not to gather information

your alowed guns to shoot people at gas stations or schools but not alowed to look at plans for a electronic circut

LAND OF THE FREE INDEED!!!!!!!

A 12v battery or a 1.5V battery? I find the 9V version buggy. And horse and whip.

Ken

Aside from shooting up the box which is what I assume you meant ( no concept of 30-06's here in the UK - is that a 300 calibre revolver ? ) - other tactics have been used against radars on poles - like pulling them down with 4WDs and sawing the pole down ! I believe the citizens of some countries have even resorted to 'thermite treatment' too - lol !

In Holland IIRC - 'concerned citizens' seek out the mobile radar traps and post warning signs in advance.

This damn country ( or some of the goddam self appointed do-gooders ) is fixated by speed radar despite the fact that road fatalities have not budged as much as a significant inch since their introduction. We get around 3000 - 3500 ? road fatalities p.a. and have done consistently so for many years now.

The fact that road deaths is attributable mainly to *lousy driving* seems to be lost on said goody goodies.

It's a great way of earning extra revenue for the authorities though.

Graham

Oh c'mon ! It's great fun ! ;-)

Nothing better to see Americans justify their collasally high rate of gun related mortality. *And* claim that it's somehow a better society for it.

A little while back I caught one of the local regional TV programmes about a US family that had moved to one of the RAF bases that the US operate here in the UK. It's like a little community in itself with shops and leisure facilities and schools ( wow - you have to - what is it ? - salute the flag every morning ? or is it just swear the oath of allegiance ? - freaky anyway ) so the residents don't actually *have* to venture out into the real UK even.

When this family did - the wife was 'worried' because the Police *didn't* carry guns !

I think she missed the point. The Police here don't carry guns because they

Graham

Politicians worship the god of revenue. Take that away and there's no interest.

I like the concept of all revenue going to the state. I think I'll prime some legislators with the idea ;-)

...Jim Thompson