Ah......the Plessey 424 or'Decca 424' to be correct. Originally a marine radar. Beautiful piece of engineering, sorted the men from the boys in bad weather. Fighting the aerial tilt, long pulse/short pulse, variable polarisation, FTC whilst doing 1/2 mile SRAs.......what nostalgia. The later versions with the 'KH front end' is quite a different animal. A lot of the fun ended after the 424!!
H49