Laser ID Not Accurate?

[happya$$]

I have had a couple of laser encounters vs the LTI Marksman (State Trooper) and my laser ID is not accurate. The pulse rate on both times that I have been hit would fluctuate between 114-141. Has anyone else experienced this?

[whistlerfan]

would be a great question for Micheal B to answer

[kpatz]

Maybe when it picks up a fringe signal, where it misses some of the pulses, it has trouble calculating the pulse rate.

I bet a gun aimed at the RD will generate an accurate rate. Unless there's a firmware issue.

[Jestr]

Maybe when it picks up a fringe signal, where it misses some of the pulses, it has trouble calculating the pulse rate.

I bet a gun aimed at the RD will generate an accurate rate. Unless there's a firmware issue.

I wouldn't think that light would change in pulse rate, unless it came from the source???

[djrams80]

I just went out and shot the Stalker out my front windshield in my garage about 10 times and the display read 130 all but one time. That one exception, it read 129 for a couple of seconds, then switched over to 130. This is obviously not a very good way to simulate a police laser shot, but it was accurate on this test.

[kpatz]

I wouldn't think that light would change in pulse rate, unless it came from the source???

The light from the gun itself wouldn't change pulse rate, but think about how a detector determines the pulse rate. It has to receive a number of pulses and calculate the amount of time between each pulse, or count the number of pulses received in a particular period of time. If the detector "misses" some of the pulses, due to the gun not being aimed directly at the detector, gun moving, car moving, vibration etc, it could lead to an inaccurate pulse count reading.

[Michael B]

The light from the gun itself wouldn't change pulse rate, but think about how a detector determines the pulse rate. It has to receive a number of pulses and calculate the amount of time between each pulse, or count the number of pulses received in a particular period of time. If the detector "misses" some of the pulses, due to the gun not being aimed directly at the detector, gun moving, car moving, vibration etc, it could lead to an inaccurate pulse count reading.

Correct

The unit can only process what it receives over a brief period and then averages it before displaying.

If there are some missed pulses, they will alter the average slightly.

Keep in mind that your detector is on your windshield and the Laser gun is most likely aimed at your front plate. It is not uncomon for this to result in some missed pulses causing the average to drop.

Things like airports and LACC systems are not trying to aim a narrow beam at your plate so these will typically be seen more conistantly and you can hit the quiet button to store them so that the next time you encounter this, you will get the display and two beeps instead of the scare the (bleep) out of you LASER ALERT.

[happya$$]

The light from the gun itself wouldn't change pulse rate, but think about how a detector determines the pulse rate. It has to receive a number of pulses and calculate the amount of time between each pulse, or count the number of pulses received in a particular period of time. If the detector "misses" some of the pulses, due to the gun not being aimed directly at the detector, gun moving, car moving, vibration etc, it could lead to an inaccurate pulse count reading.

Correct

The unit can only process what it receives over a brief period and then averages it before displaying.

If there are some missed pulses, they will alter the average slightly.

Keep in mind that your detector is on your windshield and the Laser gun is most likely aimed at your front plate. It is not uncomon for this to result in some missed pulses causing the average to drop.

Things like airports and LACC systems are not trying to aim a narrow beam at your plate so these will typically be seen more conistantly and you can hit the quiet button to store them so that the next time you encounter this, you will get the display and two beeps instead of the scare the (bleep) out of you LASER ALERT.

thanks Mike!

[Lucky225]

The light from the gun itself wouldn't change pulse rate, but think about how a detector determines the pulse rate. It has to receive a number of pulses and calculate the amount of time between each pulse, or count the number of pulses received in a particular period of time. If the detector "misses" some of the pulses, due to the gun not being aimed directly at the detector, gun moving, car moving, vibration etc, it could lead to an inaccurate pulse count reading.

Correct

The unit can only process what it receives over a brief period and then averages it before displaying.

If there are some missed pulses, they will alter the average slightly.

Keep in mind that your detector is on your windshield and the Laser gun is most likely aimed at your front plate. It is not uncomon for this to result in some missed pulses causing the average to drop.

Things like airports and LACC systems are not trying to aim a narrow beam at your plate so these will typically be seen more conistantly and you can hit the quiet button to store them so that the next time you encounter this, you will get the display and two beeps instead of the scare the (bleep) out of you LASER ALERT.

I asked about this a couple months ago when I accidently locked out a real laser gun and was told only KA can be locked out. I've got a new whistler since then but how do you UNLOCK laser pps that you've locked out?

By the way it makes sense that the RD is only going to show an average and that average can be skewed, especially since the RD is on your windshield, if the operator even moves the gun slightly your RD might not be receiving the laser hit for a split second and then re-recieve it which would also give a miscalculation

[djrams80]

I tried my Whistler against my Speedlabs laser tester and it was pretty accurate. Also, I think it alerted to an Infiniti at 975pps.