> I saw one at Sebring (LSA Expo) earlier this year that was optical. It > scanned the sky looking for things with little or no relative motion but > growing in size.
Another problem is that it only is looking ahead (OK, to 60 degrees each side) and if it is mounted on the glare shield it can only "see" level or descending traffic. Don't forget, in the crash that created the FAA, one A/C was level, the other was in a climb, and they collided without ever seeing one another. Allen G. Wiesner KR-2SS/TD S/N 1118 65 Franklin Street Ansonia, CT 06401-1240 (203) 732-0508 flash...@usadatanet.net