Could the destroyers have powered their modified radar with motors taken from desk fans?
Short answerProbably not from desk fans, because the load was too heavy; other small motors remain possible, with no source confirmed.
NotesA desk-fan motor probably could not handle the radar's weight, although other small motors could have been available. No particular motor or source is identified. The required sweep needed to cover the forward sector, neighboring ships on either side, and some area aft. That requirement makes about 270 degrees the preferred estimate for the possible modification.