Description
The P-20 is a semi-mobile radar with equipment mounted on eight Zil-151 trucks, components include the control cabin and power supply equipment as well as a trailer for the antenna and transmitter equipment. The antenna system of the P-20 consists of two open frame truncated parabolic antennae accomplishing both transmission and reception. The radar uses two antenna to determine target altitude by the V-beam system with azimuth scanned mechanically. The upper antenna is tilted to an angle of 45 degrees from horizontal which results in each target appearing twice on the indicator, the distance between the two allows the targets altitude to be approximately estimated by the operator.
The P-20 had four indicators to display the information generated from the radar, panoramic, range and altitude as well as a remote indicator. The radar used five separate channels for reception and transmission, using different frequencies to avoid mutual interference between the beams, three beam channels being used by the upper antenna and two for the lower antenna.
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