In which case I stand corrected re moving parts.
I was under the (mistaken) impression the NGs radar had a hi-tech flat aerial which scanned electronically with the plate facing forwards, mounted solidly on the bulkhead and no movement, hence the lack of clunking as the old fashioned mechanical dish hit the stops and reversed its travel as in older "classics".
Back to the books again for me, no more darkened room for a while...............
