Searchlight Control, SLC for short but nicknamed "Elsie", was a British Army VHF-band radar system that provided aiming guidance to an attached searchlight. By combining a searchlight with a radar, th
SLC Mark VI on a 150 cm searchlight being demonstrated for visiting MPs
The GL Mk. II required huge antennas to provide the desired accuracy while working at the relatively long 5 m wavelength.
This Australian Mark VI is an earlier example and lacks the IFF antenna. For transport, the antennas are stowed and moved on the same carriage. Unlimbering took the crew only a few minutes.
For contrast, the US SCR-268 radar dwarfs the searchlight it directs and required a major logistics effort to emplace.
Radar, Gun Laying, Mark III, or GL Mk. III for short, was a radar system used by the British Army to directly guide, or lay, anti-aircraft artillery. The GL Mk. III was not a single radar, but a famil
Searchlight Control radar
…the Maggie could start tracking at about 15,000 yards (14 km). A Maggie was used at Gibraltar. By 1942, development of the new cavity magnetron-based GL Mk. III radar was well underway. By moving to microwave frequencies around 10 cm, the resolution of the radar was so improved that an antenna smaller than the 150…
The magnetron, about 10 cm across, revolutionized radar development.
A Mk. III Accurate Position Finder (APF) ready for action, with its antennas raised and the carriage levelled. The cable behind the antennas runs to a winch on the front of the cabin that raises them into operating position.