1. ## effective band distance

I did a search for this and couldnt find anything but I was wondering what the effective range for radar is. We all know that a detector can "detect" radar but at what range can a radar gun be effectively used or is it dependent on band? If it is dependent, can someone give breakdown? I would imagine that if you get a detection from a radar gun, it's still possible that your distance is too far for the gun to get an accurate reading since it scatters a lot more than laser. So, basically is there a set distance that each band can detect something for the gun to work and if so what is that distance for each band? It would be great to know that radar detectors can detect bands while the band cant detect you (at a certain distance).

2. Detectors can certainly detect the radar a LOT farther than radar can get a speed reading. Generally, police radar isn't effective over 1/2 mile on normal vehicles.

Radar detector line of sight detection distances of 10+ miles is not unheard of. On regular terrain, the curve of the earth limits line of sighe between radar and detector to around 5 miles or so, unless one or the other is up on a hill or something.

In the real world, expect to get even less depending on the conditions, so it is still very important to have a sensitive detector, especially for detecting instant-on hitting vehicles ahead of you.

Here's some range tests from way back in 1979, they used a Kustom KR-11. Results are in feet.

3. Anything more recent or have results not significantly changed? And I thought only X-band could get the 10+ miles. According to GOL, the distances of the radar detectors are just about equal to the effective radar range(from above). http://www.guysoflidar.com/testjan06.html Unless I'm not understanding this chart right (which I'm thinking is the case) the V1 for x-band can only detect at 2928ft (~.5mi)???

4. Originally Posted by Viper
Anything more recent or have results not significantly changed? And I thought only X-band could get the 10+ miles. According to GOL, the distances of the radar detectors are just about equal to the effective radar range(from above). http://www.guysoflidar.com/testjan06.html Unless I'm not understanding this chart right (which I'm thinking is the case) the V1 for x-band can only detect at 2928ft (~.5mi)???
For police radar, it will always very depending on the unit used, and the radar cross section of the vehicle, etc. I think the numbers represented in the chart are still pretty typical of what you might find.

At the GOL tests the radar was purpously angled to reduce the range. In any test, the numbers represented in the results are only for that specific test situation. Getting "absolute" range of the detectors in feet or miles isn't very practical: it might show some impressive distances, but is vastly different from what one would encounter in the real-world. So the test data shows how the detectors compare to each other in the specific test situation. Understand?

Had the radar been pointed straight down our course, all of the radar detectors would have alerted the full 3000+ foot length of our course easily.

5. Must have been a crazy angle used if it was reduced more than 50% of what it can do if it was straight. What kinda angles are we talking exactly? Was that for just a worst case scenario (where using the sine law or whatever would make it the hardest to detect)?

6. Originally Posted by Viper
Anything more recent or have results not significantly changed? And I thought only X-band could get the 10+ miles. According to GOL, the distances of the radar detectors are just about equal to the effective radar range(from above). http://www.guysoflidar.com/testjan06.html Unless I'm not understanding this chart right (which I'm thinking is the case) the V1 for x-band can only detect at 2928ft (~.5mi)???
The results from that test are in the possible case and what range you could get... actually worse then the worst possible case (since the radar gun couldnt really get an [effective] reading on the 'target' car I believe Jim said... dont quote me but I believe thats true)...

The test was not to show the distance each RD could obtain a reading of a band... its well know any of the top 3 can easily achieve (literally) miles of warning under ideal conditions. That test was simply to detect the performance of the detectors under the worst of the worst circumstances, to see how sensative each RD is to each band (especially dealing with off-axis detection). Look at the black firebird (Jims), and that straight stretch of road... that is the angle (looks like 85degrees ) at which the radar guns were fired at (I believe)... so taking that into account ranges over 1000feet are outstanding.

7. So that graph was indeed for the worst of the worst of the worst possible cases? Wow...thats puts me at rest completely!

8. Originally Posted by Viper
Must have been a crazy angle used if it was reduced more than 50% of what it can do if it was straight. What kinda angles are we talking exactly? Was that for just a worst case scenario (where using the sine law or whatever would make it the hardest to detect)?
Look at the angle of the black car (Jims) to the straight stretch of road that is the angle (Looks like 85degrees), and the distance of detection was reduced (of what those detectors can do) by about exponentially more then 50%.

9. You keep saying look at his car...what vid are we talking about here?

10. Originally Posted by Viper
You keep saying look at his car...what vid are we talking about here?
Picture: Top "right"

http://www.guysoflidar.com/testjan06.html

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•