GL Mk. III radar
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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
GL Mk. III(B), with IFF
Transmitter cabin of the Mk. II radar, which indicates the size of the antennas needed at VHF frequencies.
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.
Radar, Gun Laying, Mark I, or GL Mk. I for short, was a pre-World War II radar system developed by the British Army to provide range information to associated anti-aircraft artillery. There were two u
GL Mk. III radar
…a system that would provide slant range measurements with an accuracy of 50 yards (46 m) or better. The result was an unwieldy system known as the GL Mk. I radar. The Mk. I, like the Chain Home technology it was based on, used separate transmitter and receiver antennas that had to be moved in unison to track…
Aerial photo of a gun laying mat installed on the east coast, north of Sunderland. The ramp and platform at the centre are prominent.
This image from an AI Mk. IV radar is similar in concept to the GL Mk. II, although it displays blips on either side of a centreline rather than as two peaks on one side. The blips are just visible about half-way along the baseline. The large triangles at the top and right are caused by ground reflections, and are not present in GL systems.