In 1963, an AN / FPS-90 replaced the second AN / FPS-6 height-finder and the original AN / FPS-6 was removed and replaced with an AN / MPS-14 height finder adjacent to the AN / FPS-24 radar tower.
32.
Height finders were also increasing in size, in Britain, the World War I Barr & Stroud UB 2 ( 7 feet optical base ) was replaced by the UB 7 ( 9 feet optical base ) and the UB 10 ( 18 feet optical base, only used on static AA sites ).
33.
To support Thunderbird operations in the field the regiments were equipped with the new Radar, AD, No 11 ( tactical control, usually called'big ears') and Radar, AD, No 12 ( height finder, usually called'noddy') radar, giving them a longer range surveillance system.
34.
"The first of these reports is concerned with the comparative test of coincidence and stereoscopic range finders . ( 353 ) In these tests the American stereoscopic Height Finder Ml was operated against the British coincidence type Range Finders FQ 25 and UB 7, in ranging on fixed ground targets, moving naval targets and moving aerial targets.
