I AM SURE THAT THE ABOVE RACAL RA1217 RECEIVER WAS IN USE AT PORTISHEAD RADIO/GKA IN THE MID 1970'S WHEN I WORKED THERE BRIEFLY THOU  I MAY BE MISTAKEN, I  CERTAINLY HAVE WORKED WITH THESE RECEIVERS AND CAN ONLY THINK IT WAS AT GKA. IT WAS AN EXCELLENT RECEIVER, A REAL PLEASURE TO USE.