how do these things actually work?

**againstme!** · 04-20-2006, 09:57 PM

when the jammer picks up a signal, does it match the same pulse back at the gun? then what? after it sends back the same pulse as received, does it just send back noise or inconsistant speeds so the gun doesnt know which speed to accept?

**jimbonzzz** · 04-20-2006, 10:34 PM

Take a look at what I posted here:
http://www.radardetector.net/viewtop...t=8799&start=0

I have come to understand things a bit more since then, but basically what I posted still applies.

Jim

**Ford_Focus_05** · 04-20-2006, 10:38 PM

it detects the PPS rate or Pulse per second rate

Then it matches the PPS rate with a file on a look up table which is tailored to that specific PPS rate....meaning that the guns all have specfic PPS rates...so the Jammers that have a look up table have tailored there jammers to those specific guns

The Pulse the jammer spits out has to reach the gun before it starts excepting its own pulses...then it excepts the jammers pulses and not its own..and since the jammer is not reporting anything there is nothing to report to the jammer...

in a nutshell hope that helps

**againstme!** · 04-20-2006, 10:43 PM

ok so it basically makes the gun accept the jammers signal and nothing else, but what is the jammer sending back after the pulse? by sending back a pulse, isnt there going to be some speeds calculated because it is sending back a signal? or does it just keep sending back the accepted pulse which then blocks the guns so it can never get its own signal back? make sense?

**jimbonzzz** · 04-20-2006, 10:53 PM

Originally Posted by againstme!

ok so it basically makes the gun accept the jammers signal and nothing else, but what is the jammer sending back after the pulse? by sending back a pulse, isnt there going to be some speeds calculated because it is sending back a signal?

The jammer's pulse is sent with random delays that vary too wildly to be consistent with any speed.

Originally Posted by againstme!

or does it just keep sending back the accepted pulse which then blocks the guns so it can never get its own signal back? make sense?

No "blocking" of any kind occurs. But once the guin receives the jamming pulse which it accepts as it's own, it ignores anythnig received after that until it sends out another pulse.

Jim

**againstme!** · 04-20-2006, 10:55 PM

thanks for your replys. a lot of technical stuff to understand.

**Ford_Focus_05** · 04-20-2006, 11:19 PM

There is no better teacher than Prof. Jim!

Thats were I learned my info from!!

**againstme!** · 04-20-2006, 11:23 PM

yes, i have learned much from him also. thanks for sharing jim!

**kamet** · 05-06-2006, 10:06 AM

I don't understand how it can detect anything else but its own pulse since the time it takes the jammer to detect, process and select the retrasmitted pulse from a table, the lidar's own pulse would have beaten it back to the lidar.

Wouldn't trasmitting a false pulse require almost predictive detection, sort to speak? The moment the lidar's pulse hits the jammer's detector, it is already on its travel back to the lidar, how is it possible to send a pulse back before this?

**kpatz** · 05-06-2006, 10:10 AM

A jammer can't jam the first pulse from a gun, or the first 3 or 4 for that matter. Once the jammer figures out the pulse rate, it then predictively sends out pulses ahead of the gun's pulses.

The first few pulses don't matter, since the gun can't get a speed reading until it is able to get several distance readings over time. The jammer causes the distance readings to vary widely, causing the gun to discard the measurements and prevent a speed reading.