Laser jammers

[Blackbird]

According to wikipedia, each B-2 stealth bomber costs about 550 million USD to manufacture.

Which makes me think that it would take a wee bit more than a coat of paint to make a vehicle invisible to laser & radar speed detectors.

Microwave returns from your headlight reflector in the event of a head-on pulse is your biggest issue - forget paint and the like! As has been said often enough before, you can't practically jam microwave radar, only laser and even that isn't totally guaranteed (especially with the number of rip-off "protection" products on the market). I think there are still only 2 which have survived independent tests with near-perfect results.

[CookMySock]

As has been said often enough before, you can't practically jam microwave radar, only laser

ay ? sure you can. Shoot a 34GHz signal at the radar unit and blind it. Piece of piss. Now, where to GET a 34GHz high-power signal source is the question.

DB

[Blackbird]

ay ? sure you can. Shoot a 34GHz signal at the radar unit and blind it. Piece of piss. Now, where to GET a 34GHz high-power signal source is the question.

DB

The emphasis was on PRACTICAL (as in not towing a trailer full of electronics behind you). I'll stick with my Escort 8500 and eyes in the meantime

[CookMySock]

The emphasis was on PRACTICAL (as in not towing a trailer full of electronics behind you). I'll stick with my Escort 8500 and eyes in the meantime

hehe, yup. Eyes have always done me good. The detector picks up all the mufties.

DB

[avgas]

no idea how effective they are, not used them. Radars aren't the cleverest things anyway. One radar recorded a brick wall traveling at something like 86kph apparently. Was on the web, must be true..

Doesn't surprise me - some people think that brick walls or even (heaven forbid) cheese cutters jump out at them while they are on a bike. Imagine that damage a wall doing 86kph does to you.
Last time i saw that it had "Hino" tagged on it.

[avgas]

According to wikipedia, each B-2 stealth bomber costs about 550 million USD to manufacture.

Which makes me think that it would take a wee bit more than a coat of paint to make a vehicle invisible to laser & radar speed detectors.

Ok tell me how much the follow cost to manufacture at the time....
-Ball point pen
-Kevlar (or as 3M had it as - codename : Spiderweb)
-Cro-Mo
Everything is expensive until the chinese have to make it.

[marty]

Microwave returns from your headlight reflector in the event of a head-on pulse is your biggest issue - forget paint and the like! As has been said often enough before, you can't practically jam microwave radar, only laser and even that isn't totally guaranteed (especially with the number of rip-off "protection" products on the market). I think there are still only 2 which have survived independent tests with near-perfect results.

i have always found headlights rather ineffective to focus laser on. sure it is a concave surface, but where the beam should concentrate to come back forward again, instead there is a big light bulb assembly, that disrupts the return beam. any reflectors (like on jackets or numberplates) facing forward are the best by far. i have experimented at many different distances - could get a return from 1000m easily off a number plate, but struggle on the same vehicle at 200m off the headlights.

[Blackbird]

i have always found headlights rather ineffective to focus laser on. sure it is a concave surface, but where the beam should concentrate to come back forward again, instead there is a big light bulb assembly, that disrupts the return beam. any reflectors (like on jackets or numberplates) facing forward are the best by far. i have experimented at many different distances - could get a return from 1000m easily off a number plate, but struggle on the same vehicle at 200m off the headlights.

I take it you're talking about lasers? I was specifically talking about microwaves as per Ka band. I agree about a laser.

[vagrant]

ay ? sure you can. Shoot a 34GHz signal at the radar unit and blind it. Piece of piss. Now, where to GET a 34GHz high-power signal source is the question.

DB

A couple of years back an RAF Nimrod was here on an exercise. The day they left they flew down the north western motorway and jammed (fried) a couple of radar units.

[Swoop]

A couple of years back an RAF Nimrod was here on an exercise. The day they left they flew down the north western motorway and jammed (fried) a couple of radar units.

What nice people.
We should have them visit more often.

[snowman]

Some instillation instructions here,

http://www.radarbusters.com/equipmentarticle.cfm

[Winston001]

An unlikely explanation. For the two signals to arrive back at the reciever 180 degrees out of phase, the two reflecting surfaces have to be half a wavelength apart - thats a few millimeters, and we are talking thousandths of a microsecond, not milliseconds.
DB

FYI here is a piece from Wikipedia explaining the interference pattern which achieves cancellation of the radar return.

"With radar absorbent material (RAM), it can be used in the original construction, or as an addition to highly reflective surfaces. There are at least three types of RAM: resonant, non-resonant magnetic and non-resonant large volume. Resonant but somewhat 'lossy' materials are applied to the reflecting surfaces of the target. The thickness of the material corresponds to one-quarter wavelength of the expected illuminating radar-wave. The incident radar energy is reflected from the outside and inside surfaces of the RAM to create a destructive wave interference pattern. This results in the cancellation of the reflected energy.

Deviation from the expected frequency will cause losses in radar absorption, so this type of RAM is only useful against radar with a single, common, and unchanging frequency. Non-resonant magnetic RAM uses ferrite particles suspended in epoxy or paint to reduce the reflectivity of the surface to incident radar waves. Because the non-resonant RAM dissipates incident radar energy over a larger surface area, it usually results in a trivial increase in surface temperature, thus reducing RCS at the cost of an increase in infrared signature.

A major advantage of non-resonant RAM is that it can be effective over a wide range of frequencies, whereas resonant RAM is limited to a narrow range of design frequencies. Large volume RAM is usually resistive carbon loading added to fiberglass hexagonal cell aircraft structures or other non-conducting components. Fins of resistive materials can also be added. Thin resistive sheets spaced by foam or aerogel may be suitable for space craft.

Thin coatings made of only dielectrics and conductors have very limited absorbing bandwidth, so magnetic materials are used when weight and cost permit, either in resonant RAM or as non-resonant RAM."

[alanzs]

Much like a bong............you can buy one just don't use it

You mean a "flower vase."

[alanzs]

I was pinged by something that my radar detector picked up last weekend while going north on the road past Orewa towards Warkworth. A cop was sitting in a corner, aiming at the oncoming passing lane. My screamer alerted me and I was fine. Don't know if it was laser or radar, it was over in a second or two...

[Swoop]

A cop was sitting in a corner, aiming at the oncoming passing lane.

A cop at the end of a passing lane... "how unusual"...
Presumably he was getting his quota.