May be a silly question but...

**kkoshko** · 03-12-2011 03:48 AM

...if say you just set up your jammers...and you want to know if they even remotely work, could you use a range finder? And if you jam that your headed in the right direction. I mean obviously police lidar guns are more sophisticated than a range finder but i mean there both use laser to get the distance. That's if there is no way you can get your hands on a gun for testing.

**Google Adsense** · 03-12-2011 03:48 AM

**KaPro** · 03-12-2011 08:33 AM

The only question would be if the range finder is 904nm?

**PMoth** · 03-12-2011 09:22 AM

Even though a jammer can stop a lidar gun from producing a speed, the lidar gun will still produce a distance when in distance mode at any given time. Knowing this, I can only assume that a range finder will still display a distance.

**kkoshko** · 03-12-2011 12:52 PM

Originally Posted by PMoth

Even though a jammer can stop a lidar gun from producing a speed, the lidar gun will still produce a distance when in distance mode at any given time. Knowing this, I can only assume that a range finder will still display a distance.

I didn't think that lidar guns in distance mode you could still pick up distance...if your interfering with laser beam why would it be able to pick up distance and not speed then?

**krypton2** · 03-12-2011 02:29 PM

Some laser range finders have speed reading mechanisms, too...I'm not sure how they would compare to your regular police-use LIDAR guns though, as far as the wavelength and time to get a speed...

Newcon has a few of them, I know Simmons has one or two. Bushnell might actually make one but I'm sure it's extremely expensive.

I've actually wondered this same question before...testing against a laser range finder that's used in hunting or sports really serves no real life purpose as it's not what you would encounter police using in the field...but I've wondered if jammers could accurately jam it anyway.

**yellowcab** · 03-12-2011 02:30 PM

Your jammers will probably not respond to a range finder.

**kpatz** · 03-12-2011 03:06 PM

Jammers won't jam distance readings on lidar guns. This is because only a few pulse returns are needed to get distance (in theory, only one, but typically the gun will use several in succession to ensure an accurate reading).

Guns compute speed by taking several distance readings over time and determining speed by computing the change in distance over time. Jammers work by causing erratic readings during this process, thus making it look like the car is further away on one reading and closer on another, so it can't get a good plot of distance/time (which should be linear if the car is going a constant speed).

Plus the jammers don't have algorithms for jamming range finders. They can still be used to test the detection side of a jammer and an IR camera (or cellphone camera) can verify the heads are firing, but that's about it.

**CJR238** · 03-12-2011 03:11 PM

Originally Posted by kkoshko

...if say you just set up your jammers...and you want to know if they even remotely work, could you use a range finder? And if you jam that your headed in the right direction. I mean obviously police lidar guns are more sophisticated than a range finder but i mean there both use laser to get the distance. That's if there is no way you can get your hands on a gun for testing.

Ideally test using what your up against. If your local LEO's use range finders than fine, otherwise its a waist.

If i wanted to see what the 0-60mph is on my car i wouldn't use my bike to find out. Because it can be quite possible that though your jammers alert they may not be jamming. Do whatever you can to test against what your up against. If its not possible its just a roll of the dice ether way.

**kkoshko** · 03-12-2011 03:39 PM

Originally Posted by kpatz

Jammers won't jam distance readings on lidar guns. This is because only a few pulse returns are needed to get distance (in theory, only one, but typically the gun will use several in succession to ensure an accurate reading).

Guns compute speed by taking several distance readings over time and determining speed by computing the change in distance over time. Jammers work by causing erratic readings during this process, thus making it look like the car is further away on one reading and closer on another, so it can't get a good plot of distance/time (which should be linear if the car is going a constant speed).

Plus the jammers don't have algorithms for jamming range finders. They can still be used to test the detection side of a jammer and an IR camera (or cellphone camera) can verify the heads are firing, but that's about it.

thanks for that i guess i never really knew how lidar guns got speed, but that does make sense.

**kkoshko** · 03-12-2011 03:40 PM

Originally Posted by CJR238

Originally Posted by kkoshko

...if say you just set up your jammers...and you want to know if they even remotely work, could you use a range finder? And if you jam that your headed in the right direction. I mean obviously police lidar guns are more sophisticated than a range finder but i mean there both use laser to get the distance. That's if there is no way you can get your hands on a gun for testing.

Ideally test using what your up against. If your local LEO's use range finders than fine, otherwise its a waist.

If i wanted to see what the 0-60mph is on my car i wouldn't use my bike to find out. Because it can be quite possible that though your jammers alert they may not be jamming. Do whatever you can to test against what your up against. If its not possible its just a roll of the dice ether way.

i have a police buddy who wants to test, so i'll just do it that way!