Band Radar Laser
2009
 RADAR LASER DETECTOR COBRA 15 Band #XRS 9845 US $156.80 
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 RADAR LASER DETECTOR COBRA 15 Band #XRS 9945 US $169.00
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 RADAR LASER DETECTOR COBRA 15 Band #XRS 9645 US $132.00
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 RADAR LASER DETECTOR COBRA 15 Band #XRS 9545 US $121.00
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Can K or Ka band radar go through a car that is between the police car and my car AND receive a...?
...correct reading?
A patrol car was traveling towards me, in the opposite direction. Another car was directly in front of the patrol car. My radar detector went off (K or Ka band, not laser) and I slowed before coming in direct contact with the patrol car. However, I was pulled over for speeding. The officer wrote me a ticket for 5 miles more than I was traveling.
I questioned him on the effect the car between us had and he said "none". I didn't think K or Ka band could be selective in passing through one vehicle, yet bounce from another.
Police RADAR guns are not very accurate in terms of aim point (like the LASER ones that can pick you out of a crowd) but one thing that some of them can distinguish is the difference between a car moving in the same direction and one moving towards the RADAR gun. They work off the dopper effect... so when a vehicle is moving away from the RADAR wave the reflected wave has a beat frequency that is lower and if the vehicle is moving towards the RADAR gun the beat frequency is higher... the gun picked up an oncoming wave (a higher beat frequency than the sent wave) indicating your speed. The RADAR can't go through the car in front of him easily but the wave can go through windows and if you are close enough there may have been enough of a reflection to get a reading. The guns they use have some error checking in them... they take several readings of your speed and make comparisons... they don't take one reflection and use that.
You would have a better leg to stand on in your argument if you had a car behind you that was coming up behind you quickly (accelerating) or a motorcycle or something passing you maybe... the police RADAR can't pick out one thing from the other and shows the fastest moving vehicle in a group and which vehicle that is has to be visually distinguished. If you were the only on coming car and the officer got then his reasoning is that it had to be you. Since they calibrate often and are pretty accurate I think your speedometer is off by some or you may have been going 5 MPH faster than you think you were. You could inquire about calibration though... it may be a while since the last one and if the timeframe the court allows has elapsed the judge may through it out if you see sure you weren't going that fast.
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