what were the first soviet radar with circular scan, the first 3d radar and the first vhf-band 3d radar?
innovations include the first soviet air surveillance radar with a circular scan; the p-8 volga (nato: knife rest a) in 1950, the first 3d-radar; the 5n69 salute (nato: big back) in 1975, and in 1982 the first vhf-band 3d-radar; the 55zh6 nebo (nato: tall rack).