Development
The P-40 started development in 1960 and by 1962 the radar had completed state trails and in 1963 was accepted into service by the anti-aircraft troops of the Soviet armed forces.
In 1965 the P-40 gained the GRAU designation 1S12 as it was adopted as the target acquisition radar of the 2K11 Krug mobile anti-aircraft defence system.
The P-40 was developed by Scientific Research Institute #208 GKRE, which later became known as NIIIP of Minradioprom, OKB-588 (later Lianozovskiy Electromechanical Plant, LEMZ) also assisted in the production of the prototype.
Between the 1966 and 1968 the radar was upgraded, increasing the range of the system. Later, between 1969 and 1970, the radar's range was again improved in addition to achieving better reliability.
Read more about this topic: P-40 Radar
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