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Originally Posted by Azonehits
GOL. What i would like to see in the future is having the forward facing test done consistently where minimal reflection can be obtained from radar - has to be tested on the same location as much as possible. By doing so, you will have consistent results. Good example is the Arizona test and the August tests. Looking at the test site 08/07 of the forward facing location, there is very good chance of reflection coming from trees and electrical posts. :wink:
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Hi Azone,
I am inclined to believe that any reflections from the trees and electrical posts could have only marginally affected the test results since the radar from the radar gun itself would be much more powerful than the off-axis reflections. Not only that, my calculated radar detector dBm/cm2 sensitivities do rather closely match the lab sensitivities measured by Michael B. On the other hand, I do think that reflections off of the hoods of the radar vehicle, the radar detector vehicle, and the pavement between the vehicles did slightly affect the tests since some radar horns flare downward whereas other radar horns flare upward. For example, the 9500i with its downward flared upside down mounted M4 horn pretty well trumped the Vectors with their upward flared top side up mounted M4 horns.
In the forward facing test, the Decatur K band gun was pointed down the street, and not perpendicular to the road. There would be mininal hood reflection from the radar vehicle. As for the reflection from the hood of the radar detector vehicle, I think you're the only one that keeps flogging that theory. :? I see you (MemTek) keep mentioning it in various posts how horn flaring is designed for hood reflection of radar. I don't know. This theory seems a little far fetched, because no 2 hoods are alike, and no 2 mounting locations are the same (for a given detector). How would the detector manufacturers know what car/truck/SUV you're driving? Plus, this theory assumes that hood reflection somehow is of greater importance that simple signal reception by the detector.
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I hope that in the future GOL will mount the radar guns inside a long PVC pipe, the inside of which is lined with Eccosorb, to prevent radar from bouncing off of the radar vehicle's hood or off of the pavement between the two vehicles, and to prevent radar from escaping towards the sides and possibly reflecting off of fairly nearby objects along the side of the test course.
The guns are currently mounted inside a box that is completely lined with eccosorb (front, sides and rear). Again with the hood issue...in the real world, wouldn't a police car's radar gun bounce signals off the hood, or off the pavement anyway? The eccosorb is simply used to absorb some of the radar's signal.
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Likewise, I would like to see each tested radar detector mounted atop a level piece of Eccosorb covered piece of cardboard in order to further prevent the radar detector from seeing radar reflected off of the radar detector vehicle's hood or off of the pavement between the vehicles. I think that this type of test setup would come very close to matching lab measured radar detector sensitivities and would yield extremely accurate results once the distances are converted to dBm/cm2. Obviously just one radar detector would need to be tested by Michael B in the lab so that its lab measured sensitivities could be used to normalize the distance measurements and my dBm/cm2 conversion formulas to the known sensitivity values for that lab tested radar detector. Then my formulas plus GOL's distance measurements will produce extremely accurate dBm/cm2 sensitivity results for all of the other tested radar detectors. How accurate do I think such a test setup could be? I think that the results would be accurate to +/-1 dBm/cm2 or essentially just as good as lab measured sensitivities.
Once again, Michael B's lab test results are what they are...controlled environment, bench test results. They may or may not correspond to real world tests, or to GOL tests. The GOL tests aren't done to duplicate or validate lab results. The use of eccosorb underneath a detector is in no way a real world test (unless you're driving around with eccosorb in your car :wink:
J/