in car radar jammer

I

inline 6

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on 5 gear last night on ch5 in the uk they have tested all radar locating units and they had one that picks up the mobile radar guns and also send out a beem that jams the radar gun and the cops see is a erorr sign on the gun

but I must tell you this is not look on very well by the cops if found on the car you have the explan your self
 
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Big Daddy

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Spidey said:
they don't.[;)]
Click to expand...
Your correct. I have a brother than is a State Police Officer and we have personally tested jammers against his K Band, X Band, Lidar and every other radar he could find. The radar never failed to read a correct speed, never got an error message and when calibrated after each jammer test, came up in specs. Don't waste your money.
 
mikev

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In the UK we don't use just hand-held radar they usually use mobile laser instead. thats easier to jam as it has a more defined focal point (hench more accurate which is why they use them!) with radar you get the wave going over a larger area of the car (where the jammer may not work) so it will return the correct distance (and speed) or maybe a few Mph out depending on the accuracy of the software to cope with lower returns. the laser jammers that work also return a signal that overwhelms that of any original return giving the officer a return of say 30Mph when your doing 60Mph. the trick is always being able to pick up his waves and return some 360 degres spherical signal stopping and sending out from every part of the car. one spot missed means that there is the possibility of returning the correct speed! (which is why they usually don't work [:)]
 
wileycoyote

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It's been a while, but the old hand held K55 units and newer in car units used to get a little confused when you pointed another unit directly at it. Most of the early Lidar systems could be confused by a really (I mean REALLY) bright infrared light. But it's been a while since I had opportunity to play with those toys. Since the technology has no doubt improved, I suspect Big Daddy's right, don't waste your money.
 
MrElussive

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Don't waste your money on a radar jammer. Your best bet is to get a really great radar detector and a really great LASER jammer. Companies are pushing Laser jammers now because it is very hard for radar detectors to detect Laser (due to their narrow beam), so to help your ass out, you can purchase front and rear laser jammers (discretely mount on your license plates) to help you from getting speeding tickets. The only truly effective laser jammers, though, are the ones from Escort and BELtronics, according to the guys at radartest.com.
 
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Big Daddy

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They just don't work....

Maybe this article from Automobile magazine will help. For the most part they just don't work and in some cases help the radar/laser (Lidar) aquire your speeding auto faster!

Jammers
 
MrElussive

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Yeah, the cheap $15-$30 ones do absolutely nothing. But those license-plate-mounted laser jammers do their job if you get a good model. None of them guarantee 100% safety, so the idea is that as soon as the laser jammer tells you that your car has been shot with a laser (and that it probably blocked the cop's first attempt), you should slow down as quickly as possible. The cops aim for the license plate first because it gives them the most accurate reading, but if they don't get a report back, then they will aim at your grill or your headlight or something. Laser jammers really do work as long as you work with them. [:)]
 
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Big Daddy

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Read it again, they do not work. Your competely wrong on the front license plate statement. The reading on Lidar is accurate anywhere on the vehicle including from an angle to the body side. Not to mention that officers are not targeting the license plates, they are targeting the windshield and or side of the car.
 
MrElussive

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Actually, I'm not wrong at all, otherwise I wouldn't have said it...there's just no point to waste time, typing up wrong information. Usually cops aim for your front or rear license plate when they want to get you with laser. True, they can aim anywhere on your car and get a reading, but I have read many articles regarding laser jammers, and I say exactly what I have concluded from those articles.
Check out this article:
http://www.radartest.com/article.asp?articleid=8502
 
wileycoyote

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Kirby

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Warning: long and somewhat technical - in short, howstuffworks.com is wrong AND right. Read on if you dare.

I read the referenced reviews that say the devices work, and the analysis that says they don't work. I have some experience in designing IR transmitter/detector circuits and software. (If you're curious, I designed the laser gun electronics and software for this laser arcade system - www.zombieworld.net). I'm absolutely no expert on the matter of LIDAR, but I have a few observations related to the howstuffworks.com article:

This is MOST important from howstuffworks.com:
"Is Jamming feasible? The two techniques outlined here do not appear to be viable on technical grounds. Assumptions about these techniques are built into the descriptions below, and a more $ophisticated jammer might work."

His argument that the power requirements of 12 watts exceed the capability of an LED. True if talking about continuous current flow. But if you pulse the power, you can increase the effective wattage. In simple terms, you may know that an LED requires 1.2 - 1.4 volts nominal and can burn out around 1.7 - 2 volts. But by pulsing the power, this can easily be exceeded. I run my infrared LED in the gun at 5 volts PULSED with a 20 ms square wave. Pulsing simply gives the diode junction time to cool off between light bursts. With proper component selection and changing the duration and duty cycle of the square wave you could go higher. Now use 6, 8, 10 LEDs and you increase your infrared light output power quite a bit. 12 LEDs at 1 watt each effective power is very doable.

He appears to assume the use of 1 LED for his calculations. Looking at the jammers, the units they call transceivers are much larger than what is required for a single LED. That is a rather large, expensive enclosure for a single LED. If you used 10 or 12 LEDs that would certainly fit in that enclosure, you COULD achieve the power levels he requires to blind the LIDAR. By using a simple plastic lens for each LED, you could further focus the beam down the road, further increasing effective power, and point some of it 2 or 3 degrees to the side.

I'm guessing that if you dissassembled one of the transceivers, that's what you would find inside - a more sophisticated LED arrayed unit, exceeding his basic assumptions.

This would also explain the difference between good units that work and cheaper units that have very limited range.....
 
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Big Daddy

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"Usually cops aim for your front or rear license plate when they want to get you with laser"

This is just not a valid statement. I have 22 years working with law enforcement (in Idaho and Washington) and wileycoyote is correct, most officers aim for the center of mass. Never in any lidar class, police operations manual, or lidar instruction manual did I see any training indicating that you should aim at the license plates, in fact most said "center of mass". Sorry but this is one area of my expertise.
 
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