SLD920X radar detector/jammer - does it actually work??

Or if they were built like this:

-- Cheers! Rich ------ "Cover your stump before you hump. Before you attack her, wrap your wacker. Don't be silly... protect your Willie. Wrap it in foil before checking her oil. If you're not going to sack it, go home and wack it. -- National Condom Week"

Fortunately AZ is an anti-government state, per the Reagan definition.

...Jim Thompson

Then they arrest you for not having, modifying, or altering your license plate. Problem solved.

Yet. VT was going to drop the front plate (at a savings of some real $$), but the cops put the kibosh on that! Guess why? ...and how long will it take AZ to figure it out? ;-)

I've gone through quite a few of those, too.

Very odd as to why nothing ever got picked up...

Incidentally, the jammer isn't supposed to be obvious. If it's working properly, the speed gun just doesn't show a reading at all. But I would expect the police equipment to be continually upgraded, whereas motorists would be stuck with their expensive SLD920X installations for years.

It receives passively, and upon detecting a laser it jams it. You also get an audio warning (which is the bit I've never heard in several years, although the sounder does work, during the power-up tests) and then you jump on the brakes and switch the unit off fast, allowing the PC to get a valid reading.

snipped-for-privacy@somewhere.in.the.uk.com wrote on Mon, 27 Jun 2005 13:03:15 +0100:

If they point a speed gun at you, and they don't get a reading, I would call that obvious.

So it can start jamming the signal fast enough to prevent any return to the laser gun?

"Dr Zoidberg" wrote in news: snipped-for-privacy@individual.net:

laser speed measurement is actually a number of distance measurements that are timed,and a processor calculates the speed from the change in distance over time.So,a number of laser pulses are required to make a speed measurement,and a pulse train in the range gate will confuse the processor.

snipped-for-privacy@somewhere.in.the.uk.com wrote in news: snipped-for-privacy@4ax.com:

What does a laser speed gun do if it receives NO reflected signal? Would it consider that "jamming"?

It has to receive it's reflected pulses to make it's distance measurements,and extra pulses received will throw off the change in distance measured.

"David Taylor" wrote in news:d9oush$lku$ snipped-for-privacy@outcold.yadt.co.uk:

if there was no reflection of the pulses,the laser speed gun cannot make it's measurements.

Is that "jamming"?

(no,it's stealthing)

That's what I thought. Sounds like an approach which is wide open to failure.

Daytona

Jim Yanik wrote on 27 Jun 2005 14:04:09 GMT:

So, how do you stealth a car, required by law to have a reflective numberplate on the front of it?

Meanwhile, in uk driving groups and in the UK in general, reflective numberplates front and rear are legal requirements on all vehicles registered since 1973.

Laser SDD's very very often fail to get a reading, and if the tripod is poorly damped and/or the van is parked close to the road then an error code can be produced twice as often as a good reading.

The modern devices will only be active for about five seconds and not produce a jamming warning on the SDD, therefore the operator will just target the vehicle again and get a good reading. The theory is that the laser alarm goes off, the driver stands on the brakes and the second time the operator gets a reading. Unless the car is stoped and searched there is no proof that a jammer was in use.

Gareth

Yes, the commonly used laser speed detection devices (SDD's) send out

Gareth

Incorrect , they are not required on the front of motorcycles or motorscooters

At the standard operating distance the laser beam will have diverged quite substantially, to the point that it could be a metre wide.

The problem with detectors and jammers is that they need to be fitted properly. I went with my boss to see somebody about fitting an Origin B2. The installer's detector was fitted onto the rear view mirror and was obscured by the tint. I questioned whether this was a good idea and the reply was "well it works when I point a Nokia phone with IR enabled at it". Good test method then! As the range increases the quality of installation will have a critical effect on the detection capability. A detector and jammer *should* be fitted around the number plate area because this is the most vertical area of a car and hence it recommended for targetting. Apparently the reflectiveness of the plate only has a marginal effect.

Gareth

--- Why are you getting so upset?

All he did was bring up a couple of instances which you hadn't covered.

Besides, who knew you were posting from uk.rec.driving.? There are currently four newsgroups to which this thread is being crossposted, and even if we knew that it had originated in uk.rec.driving, there's no hint that it's primarily about car driving (as would be obvious if it came from uk.primarily.about.driving.cars) is there?

-- John Fields Professional Circuit Designer