Overpass testing

**RacerX** · 05-29-2006, 11:56 PM

Well i finally found a decent location for the overpass testing i've wanted to do.
it's about 15' up, plus another 5' or so for gun height.

i shot from 1 lane over and about 3-4 lanes over for front shots, and about 1 lane over for rear shots.

This was mainly a Blinder test with some ZR3's added to the mix.

i had several questions i've been wanting answers to.

1. How does performance compare to side and straight shots?

2. Does height affect jammer performance to any big degree?

3. Does my setup work to protect me from overpass shots, front and rear?

4. How well do jammers do through glass, and can glass/tint affect performance?

5. How about roof shots?

well i've been able to come up with the answers now.

First, as i suspected, my jammers had a bit more of a struggle with overhead shots. my reason for this suspicion is because i noticed that when i look at the jammer heads firing with a camera, as i move the camera up or down, this affects the intensity of the beam. level with the camera gives the brightest intensity.

For those that have seen my videos, i can obtain JTG and JFG results, consistently from straight and side shots.

so how did i do with overpass shots?

from the front, i was able to get PT's from about 77' up to one with about 220'.
i had a JTG, but the gun shifted at the last minute.
in the real world fortunately this won't be an issue in my case, as i had no problem jamming from beyond that, and at that range you would see them, but nonetheless, PT is PT.

the rear was a different story. Due to my low mount, the Blinders really struggled. i was able to get several PT's at different distances.

The ZR3's in my rear window had trouble and did not help much with the window up. however when i rolled the rear window down, i got a JFG!

So the shifters helped on a high shot, but not as well if they are obstructed by glass and tint.

the overpass shots definately take advantage of weak spots in a setup.

i was able to pull some roof shots on cars, including mine without jammer, but not with, since i have a shifter sitting top and bottom of my windshield, facing up at an angle.

from ground shots i can't get a roof shot reading either, not even with jammers off.

with the ease of frontal shots, roof shots are much harder and would be a "last resort" i believe.

while i continue to sift through video footage, here's a little teaser for you, through the scope of course.

10.4 MB
http://donspc.com/Forum/overpassteaser.wmv

for more videos through the scope, look here.
http://www.radardetector.net/viewtop...=140294#140294

Suf Daddy · 05-30-2006, 12:10 AM

The first punch through in the video is a sweep up the hood. IMHO no front mounted jammer placement inside of ~200 feet is going to provide enough coverage to cover the hood, several inches to feet behind the TX heads.........

Would an additional jammer head along the wiper blades / hood edge provide the overpass punch through assistance you need?

Maybe!

-Suf Daddy

**RacerX** · 05-30-2006, 12:27 AM

didn't seem like it, since i have a shifter sitting at the bottom front of the dash, pointed up slightly.

if i shoot up higher to the top front and windshield area, i get no readings.

in other video footage i have, i got readings shooting down lower on the front also.

i agree, at that angle and distance, the beam is so tight.

given the ease of shots, i don't see them waiting until the car is right under them to shoot, so i suspect that i would have time to slow even if i don't adjust anything.

that teaser was about 2 minutes of video. i have about 30 good minutes of video, not only my truck front and rear, but other vehicles, front and rear as well.

it was nice being able to pick off cars at 1200' away or so, yet without a jammer on, i was unable to get a reading until about 800 something feet.

**outrun** · 05-30-2006, 05:43 AM

Now that was cool. I think it's the only video that has not been done on here if I can remember. I gotta say that is one stealth truck. When it is coming towards the camera it almost looks like you have a solid black cover on it.

**thestaton** · 05-30-2006, 06:25 AM

wow!!! man RacerX that is awesome! So what's the deal I'm guessing your back window just slides down like in a limo or something?

Although it was not odvious on video but did that overpass have a chain fence you had to work around?

I dont know if it would be relevant however I would be interested to see what would happen if someone where to mount a diode based jammer AL / Lidatek somewhere in the middle of there windshield wipers. Just angled up slightly, I wonder if this would help at all with overpass shots?

**jimbonzzz** · 05-30-2006, 07:14 AM

Wow that looks like some really awesome testing. I have a strong feeling that this will end up being VERY difficult to top, by GOL or anyone else!

**happya$$** · 05-30-2006, 09:50 AM

WOW that is AWESOME. GOL who? Outrun who? Your video shooting skills are top notch. Ladies and gentlemen we have a NEW Video Forum Champion Raceeeeeeeeeeeeeeeeeeeeeeeeer XXXXXXXXXXXXX! GREAT job man way to step up to the plate and do a test that has NEVER been done before and one that CAN NOT be topped!