Originally Posted by
dduxbury310
The first airborne radar sets carried aloft (at least in Britain) were certainly not AI (Air Interception) sets, that did not come about till somewhat later. I believe it was in fact a form of ASV (Air to Surface Vessel) equipment which first became airborne in the late 1930s, from my hazy collections of the Robert Watson-Watt autobiography.
David D
Other way about, the development of ASV was as a result of the early work carried out on AI, and discovering (by accident) it could detect ships. Development was faster and ASV came into service earlier.