Type 984 radar

Type 984 radar was a British radar system introduced in the mid-1950s. It was a rotating mechanically stabilized 3D S band radar, measuring longitudinal position, latitudinal position, as well as target altitude, devised by the Admiralty Signals Research Establishment. It did this by creating a stack of vertically scanning beams. It had one stationary beam, as well as five scanning beams fed by four magnetrons.

The Comprehensive Display System (CDS) used with the Type 984 was revolutionary in that, with the Type 984 it performed both the search and track function, as well as air-traffic control, something that would not reappear until decades later.

It had a range of as little as 40 nmi (74 km; 46 mi) for small low flying aircraft, and as long as 180 nmi (330 km; 210 mi) for larger higher flying aircraft.

The 30.5-long-ton (31.0 t) installation could only be fitted to the largest ships, and in fact was only used on three; the aircraft carriers Eagle, Hermes and Victorious.