Unfortunately, thinking about it now, I've had a couple of other rear facers with a V1 alert after passing, and no LI alert. Always assumed, the Poliscan had just been setup and was in self calibration/warm up mode prior to actually prosecuting targets, and was not transmitting its usual pulse rates that the LI detects as Poliscan.

BRD - do you know if they is a delay between jamming commencing and actual audio alert on the ALP, such as happens on the LI to avoid brief falses ?