Description of the radar set, tactical-technical characteristics
Figure 1: The mobile P3M- sersion, (Antenna left)
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):|
|peak power:||55 kW|
|instrumented range:||120 km|
|range resolution:||2.5 km|
|hits per scan:|
The first Soviet radar unit to the determination of 3 coordinates was built approximately end of the World War II. The radar station was called “Pegmantit 3” - or abbreviated for P 3. There were two modifications: a mobile (P-3M) and a fixed site (P-3A) version. The mobile version was built in containers on two trucks. The transmitter and and the receiving system were put in a separate container. The display still was an A-scope.
If the display is an A-scope only, this radar cannot rotate quickly. It has to be assumed that the turn was manually carried out (like a direction findig equipment by radio-monitoring). Otherwise the given accuracy in azimuth isn't concurring with the poor antenna gain of a single pair of Yagi-antennas to be expected.
The elevation angle was determined with a so-called Goniometer. With a nomograph the elevation angle could be converted to a height value depending of measured range.
- of the azimuth determination: 4°
- of the range determination: 1,5 km
- of the height determination: 1,5
Source: G. Nitschke, K.-H. Lau, “Von der visuellen Luftraumbeobachtung zur elektronischen Luftraumaufklärung”
in: “Militärwesen” 7/72 - Ausgabe B (Luftstreitkräfte) Militärverlag der DDR
Figure 2: An artists impression of the fixed site P3A-version