The one big addition that i beleve Escort did to inhance the above is the horn on the 9500I is designed to help filter out those useless off axis falses “Detection range” verses “Sensitivity
”. The 9500I has very good sensitivity but on signals passed 35 degrees the sensitivity starts to decrease(detection range
is not affected and that’s also why “H” mode is still quiet). The horn actually takes into account for “Cosine error/effect” any radar more than 40 degrees off axis will show less than 80% of your speed so this is considered a low threat. For example if you are going 70 in a 55 zone and the LEO’s radar is 40 degrees off axis, his radar will show only 56mph. This dramatically reduces the falses from automatic doors without sacrificing real threat detection range
I figured the angle of the walls on the horn at 15 degrees would equate to the off axis decrease. Because 15 degrees times 2 (each side at 15 degrees) plus add the antenna width so the total equals 35 degrees and that’s where the off axis starts to decrease (all horns seem to be similar).
Signals from motion sensors are, in most cases off axis from the side of the road, not sitting in the middle of the road facing you or very strong. So by just shaving a little off axis you maintain detection range with creating less falses.
Most falses will alert your RD for a couple hundred feet when you are near them because they are usually over 40 degrees shooting across the road. Now if theirs a LEO off axis down the road you will pick up his signal much, much farther. Even if he’s 40 degrees off axis he’s so far down the road when you receive his signal he's essentially only 10 degrees off axis. Because of this, detection range would be maintaned for around-the-curve or over-the-hill encounters.
A discussion of the M4 horn: K band door openers...Opinions please