You just brought tears to this former B-52 EWO's eyes with that simple explanation.

On a side note, the controllers have a lot to do with it. San Antonio eliminated their ASR capability before the T-37s left Randolph, Laughlin got rid of their capability because it was too hard to keep people trained. A poor excuse at a UPT/AETC base IMHO. Ironically now they have the new digital signal processors in the RAPCON/TRACON airport survelliance radars and their accuracy would probably go up.

Got an ASR at Waco in the last six months and the controller never got us more than 1/4 mile off the extended centerline I had drawn on the GPS moving map. I asked if he had the new radar and he said no, still doing it old school on the analogue scope. That guy was obviously an old hand at giving ASRs