Laser jammers

[Boob Johnson]

how much are they??

M25 = $650
http://www.trademe.co.nz/Trade-Me-Mo...-126365190.htm


M50 = $980
http://www.trademe.co.nz/Trade-Me-Mo...-125872205.htm



Not sure of the dif between the two

[Blackbird]

There's only two on the market that have been independently tested and stand up as absolutely reliable, the best being the Blinder. I'm with Archer though, the risk from a laser is very low so I haven't bothered to buy one (ahem, not that my wife would let me anyway) DO NOT BUY THE ROCKY MOUNTAIN JAMMER, IT DOESN'T WORK.

[hospitalfood]

mmmm, seems like its not worth it. you can get paint on stuff for the front of your bike thats makes it harder to lock on to, not sure if its for radar or laser but my guess is radar. it is heaps cheaper i think, like about $40, don't know if it makes the bike look like shit? probably.

[bucket boy]

I have the blinder m25 along with bell xr or sti driver wat ever want to call it
the difference between m25 and m50 is m 25 2 sensors ,m50 4 sensors remembering these were brought out for cages so when you mount on scooter you only need m25

[Boob Johnson]

I have the blinder m25 along with bell xr or sti driver wat ever want to call it
the difference between m25 and m50 is m 25 2 sensors ,m50 4 sensors remembering these were brought out for cages so when you mount on scooter you only need m25

Work ok for ya? Saved ya before? Any hassles from cops (as in did they know u had it)

[bucket boy]

they work have on and of switch for the money i wouldnt get another one ive seen about 4 radar guns since fitted and detecter had already gone of warning coppers no youve fitted one so make sure everything is perfect on bike cause they dont like them

[Sparkz]

I hate to rain on the parade, but Lidar, or police laser does not use doppler at all. There is no phase shift to speak of.

It sends out a really short (about 15ns) pulse of Infrared light at 905nm and then times how long the reflection takes to get back to it. This gives the distance to target (cos of the speed of light and all). It then sends out another pulse and measures how long that one took. The difference between the two gives the distance travelled by the target, and using the time between pulses, speed is calculated.

The pulses are sent out every 1ms, or at 1kHz. The trick to confusing it is to send out laser pulses (or just 905nm infrared from heaps of IR emitters) at a much higher rate than this to simulate noise. 100kHz to 1MHz will suffice.

A laser jammer is really easy to make, and I suspect most commercial ones should work OK. The tricky thing to jam is radar. That does use doppler and is a bugger to jam.

[Mikkel]

I hate to rain on the parade, but Lidar, or police laser does not use doppler at all. There is no phase shift to speak of.

It sends out a really short (about 15ns) pulse of Infrared light at 905nm and then times how long the reflection takes to get back to it. This gives the distance to target (cos of the speed of light and all). It then sends out another pulse and measures how long that one took. The difference between the two gives the distance travelled by the target, and using the time between pulses, speed is calculated.

The pulses are sent out every 1ms, or at 1kHz. The trick to confusing it is to send out laser pulses (or just 905nm infrared from heaps of IR emitters) at a much higher rate than this to simulate noise. 100kHz to 1MHz will suffice.

A laser jammer is really easy to make, and I suspect most commercial ones should work OK. The tricky thing to jam is radar. That does use doppler and is a bugger to jam.

Nice one!

That makes perfect sense. It's impossible to make electronics fast enough to react in time if it has to analyse the incoming signal and send out a jamming signal to match the reflection of the incoming signal.
1 ms however is heaps of time for the jammer to start it's jamming before the second measurement is taken.

Thanks mate!

[Gremlin]

mmm would of thought there would be high usage in Auckland, certainly on the motorway(s)

and 11.30pm on a weeknight... so far in the distance, you never saw the cop until well after he checked you

The tricky thing to jam is radar. That does use doppler and is a bugger to jam.

I want strawberry jam!!!

[Swoop]

mmm would of thought there would be high usage in Auckland, certainly on the motorway(s)

Plenty in use on the motorways, AND ALSO inner city/suburb streets! Was lasered in New Lynn the other week. No luck for Mr Plod though...

mmmm, seems like its not worth it. you can get paint on stuff for the front of your bike thats makes it harder to lock on to, not sure if its for radar or laser but my guess is radar. it is heaps cheaper i think, like about $40, don't know if it makes the bike look like shit? probably.

The paint-on stuff??
You are better to go and put a tinfoil lining into your helmet.......

[hospitalfood]

already use tin-foil in the helmet, trying to keep the thoughts in....or out???

[homer]

Nice one!

That makes perfect sense. It's impossible to make electronics fast enough to react in time if it has to analyse the incoming signal and send out a jamming signal to match the reflection of the incoming signal.
1 ms however is heaps of time for the jammer to start it's jamming before the second measurement is taken.

Thanks mate!

Confused the hell outa me and i dont have either......>>!!!!!

[JMemonic]

For the price of one, when was the last time you actually saw a laser being used.

About a week ago one a 2 laned road here in a 50K zone where folks regularly push 70 odd, there was one guy with a laser and another 4 collecting cars he was pinging, they had a good queue lined up when I went past.

[davereid]

Traffic lasers rely on the doppler effect to measure your speed.

Normal radio frequency radar works on doppler. I'm not so sure about laser, I'd be surprised, its much better suited to measuring the transmission time/reflection equation than doppler, which is very tricky to measure at the very shout wavelength of laser.

The police have been reluctant to loan me any spped detection equipment to test my theories, but have a look at http"www.eslnz.com/radar.html" for a summary of those things I am sure of.

[Mikkel]

Normal radio frequency radar works on doppler. I'm not so sure about laser, I'd be surprised, its much better suited to measuring the transmission time/reflection equation than doppler, which is very tricky to measure at the very shout wavelength of laser.

The police have been reluctant to loan me any spped detection equipment to test my theories, but have a look at http"www.eslnz.com/radar.html" for a summary of those things I am sure of.

*nodnod*

I already acknowledged this when Sparkz put it down so well a few posts back.

And yeah, they are a bit stingy the police about allowing us to try out their toys.