# Thread: Does the speed of your car affect how well a LJ works ?

1. ## Does the speed of your car affect how well a LJ works ?

Does speed change performance ???

2. I think it does, the faster your car is going the harder it is for a Lidar gun to get a locked speed reading.

(Correct me if I'm wrong)

3. That is my understanding as well. Is it because it is harder to "keep up" when targeting?

4. Originally Posted by Silverstreak98
I think it does, the faster your car is going the harder it is for a Lidar gun to get a locked speed reading.

(Correct me if I'm wrong)

That's very good to know and it kind of answers my question, but what I really wanted to know is if MY laser jammer works better at low speeds or high speeds or if it's the same.

Thanks
Jack

5. Faster vehicle speed = lower punchthroughs.

As for the reason? It might just be the simple fact that the vehicle travels further before the gun can finally get enough samples for a speed reading.

6. One of the operators manuals quotes 0.3 second @ 60 MPH.

Since the refraction of the LIDAR is determined by vehicle speed and direction, I'd go with the Professor.

Since some manufacturer took a sample speed at some acquisition time, I'd say faster reading towards the operator, and slower away from it.

Then factor in vehicle speed.

Originally Posted by jimbonzzz
Faster vehicle speed = lower punchthroughs.

As for the reason? It might just be the simple fact that the vehicle travels further before the gun can finally get enough samples for a speed reading.

7. If faster makes it harder to get PT on a jammer why do all the test conducted use speeds like 20-30mph..Why not do some high speed tests say at 50-60mph.

8. Originally Posted by mhardy2288
If faster makes it harder to get PT on a jammer why do all the test conducted use speeds like 20-30mph..Why not do some high speed tests say at 50-60mph.

For most of us it is difficult to find a 2000 FT piece of road where we can go that fast. I'm limited to about 35-40MPH in my testing spot. If we went 80 down that road the police would be there in no time.....

There is less targeting time the faster you go. Yes, it is easier to find a "hard point" on a car or truck when you can target it and pan for twenty seconds at 30 MPH.

The professor is correct

9. Originally Posted by jimbonzzz
Faster vehicle speed = lower punchthroughs.

As for the reason? It might just be the simple fact that the vehicle travels further before the gun can finally get enough samples for a speed reading.
Originally Posted by mhardy2288
If faster makes it harder to get PT on a jammer why do all the test conducted use speeds like 20-30mph..Why not do some high speed tests say at 50-60mph.
This is why we at The CFL Testing Groups' sessions run at 20 - 30 MPH as this is a true test as to the capabilities, or lack thereof, of a particular Countermeasures.

Cliff - C55

10. Most of the time, "real world" results will pan out better than "worst case scenario" results. As Mthman said, there is more time to find a weak spot, especially guns with a good "feedback" tone.

A couple examples I can think of would be eric's ZR3s. On paper, the ZR3 may not seem like a good performer, but you can see from his various vids, the ZR3's do their jobs. The same goes for my single head LPP. I remember people said it wouldn't do much up front, but it had 3 (what I would consider) saves. It's also the same for the brute force Lidatek. On paper, it seemed like an alright jammer, but the real world track record said otherwise. Even though they're not active jammers, passive countermeasures also seem to perform better real world.

The reason worst case scenarios are done is because you never know when a LEO might get smart/lucky, and get a PT. If you can JTG in WCS testing, you can rest assured you'll be up for any real world encounter.

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