Radar Jamming

No, it's a .30 calibre (7.62mm) rifle.

The rifle is easier, and a 30-06 is overkill. A .22LR or perhaps ..22Mag is good enough and doesn't make so much noise.

Some have been arrested for doing such, here in leftpondia. Sometimes the charges even stick.

Sure. Speed-traps aren't safety related, rather are revenue enhancement devices. FOrtunately, most cops aren't looking for those going just a bit over. I just drove 1100mi (return trip Friday/Saturday) at 10+ over and saw at least two dozen "bears", none even looked at me. They were looking for the >20 crowd, evidently.

When they dropped the speed limit to 55MHP thirty years ago, the traffic deaths dropped for a while, then climbed back to where they were. When they raised it back to 65MPH the deaths dropped again. Last I looked they're still falling.

Bingo! Vermont passed a law so virtually all "revenue" goes to the state. The result is that localities aren't so interested in radar traps. ;-)

About

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Andy writes:

That sounds like a neat thing to try. I would mount three mirrors as

a corner reflector, which essentially BEAM the laser signal back to the

source --- very directional , and a very high reflection coefficient. Then, if the assembly was mounted on a bigass speaker assembly, which was modulated with an audio tone ( 2V/lamba again) it should do the same as the backscatter tag I have mentioned before, only at light frequencies. I would really like to try this --- the three mirror technique is used for enhanced reflectors for sailboats - to give a bigger radar return- only they are made of metal to be useful to radar signals....

I think you are onto a good idea, but a three corner reflector will give a much better RCS return since this arrangement is like a beam reflector. You gotta try it out with a laser lever or pointer to see how well it works, but the return is very high......

If you, or anyone else, would like to BS about this, I would be please to correspond.

Andy at snipped-for-privacy@juno.com

Well thanx Mac, thats all i wanted was some ideas and to see if anyone had tried it. Not all the BS from these F_cking yanks and their guns, they can't leave em out of one conversation.....DEPENDENCY!!!!! hehehehehe

My brother was working in Damascus for a few years, the water supply was always a problem.

"Why cant they fix it" I asked him

"Because the politicians cant figure out how to make money from it" was his reply

martin

"Wales is a big welsh-shaped rain collection device"

These days, most stationary speed traps in my area use laser guns. About the only place radar is still used is in patrol cars while in motion.

I've wondered about the effectiveness of mounting a set of corner reflectors on a spinning disk (inside a radar-transparent enclosure, of course). You could increase or decrease your reported speed by choosing the direction and speed you spin the disk. This is completely passive, just like your idea, but has the advantage of being low-tech.

I'm not an RF guy but I assume that a fairly small intentional reflector can produce a reflection that is larger than the backscatter from the car body. The spinning will also impart some sort of sinusoidal variation to the reflected signal frequency, but I don't know if this is a good or bad thing. The widget could be mounted on the roof (not so good for cosmetics), or possibly inside the vehicle (much better).

Does this idea have any merit?

I've found, through experiment, that sufficiently rapid deceleration renders the police radar non-reading ;-)

...Jim Thompson

I got an "energy ticket"... back in the Carter double-nickel days ;-)

...Jim Thompson

A friend used this technique on a 'cycle to beat a 90-in-a-35 rap. THe RADAR wouldn't lock, but the cop eyed him. Instead of a 55-over ticket (likely a felony), he got a

I am a "Yank." My views on guns, the 2nd amendment and what it means for us here in the USA would probably not please you.

I have not found it fruitful to talk about such matters in this newsgroup. I only mention it because you seem to be implicitly enlisting me as an ally, and I don't particularly want to be your ally.

;-)

--Mac

Not as a practical solution. I think the corner reflectors have to be fairly large (more than a wavelength) to overwhelm the return from the car.

But I have no doubt whatsoever that it will work if the spinning disk is large enough. Say as wide or a little wider than the car, for example.

A similar idea is to somehow put the reflectors on the wheels of the car. If you could make the bottom half of the wheel much more reflective than the rest of the car (including the top half of the wheel: obviously this would only work for one direction, forward or back) then radar guns might just not work on your car. But in reality, I don't think you could accomplish this and still have a practical wheel.

--Mac

Since radar speed traps are moving to other technologies ( the most insidious being high definition optical scanning that reads your registation plate and calculates your speed at the same time ) this is only likely to be a temporary palliative.

Best advice ( dunno if they're available over there yet ) is to get a GPS based device that compares your location with all known speed trap sites. Since this is marketed as a safety enhancement product it hasn't been banned.

Graham

If you want to fool doppler, just use a TWT amp transponder, but serrodyne modulate it.

Good Luck! Rich

Let's not blame Jimmy for what was actually an Imperial Edict from your fair-haired proto-neocon, Richard M. Nixon, AKA Trickee Dickee.

Thanks, Rich

I thought the '55 saves lives' campaign was bogus, but I still kind of like the idea - if you must arbitrarily set the limit at 55 - of anything between 55 and 75 being an energy offence as opposed to an insurance hiking moving violation and crime against humanity. Sort of like the pay to pollute gambit for industry.

Bob

I read in sci.electronics.design that Barry Lennox wrote (in ) about 'Radar Jamming', on Fri, 15 Apr 2005:

The British ones have a low-pass filter with a cut-off below 1 Hz, so anything vibrating just doesn't register.

I ran across an article just a few days ago debunking '55 saves lives', I'll see if I can locate it again.

We (in Arizona) are about to raise all freeway speed limits to 75, which is the "granny" speed around here.

I understand they've been nailing people right and left doing 110+ on Loop 101 ;-)

...Jim Thompson

I used to drive from Phoenix to Prescott fairly regularly, and if you drove less than 80, cars would blister your paint passing you :)

Bob

Yep. I'm heading up there in about two hours... transporting a

...Jim Thompson

Give my regards to Whiskey Row!

Bob