[Julesomega]

The Plessey PRS 2280 was a general coverage comms rx which offered ISB synchronous reception of either sideband. Just dug out a review in SWM by John Wilson from Oct 1988 in which he compares it to the Racal RA1792. The 2280 uses a 100Hz crystal filter to lock the CIO and Wilson was particularly impressed with its use for broadcast reception.