Description of the radar set, tactical-technical characteristics
Figure 1: OPRL-4
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OPRL-4 was combined airspace surveillance and approach control radar operating in X-Band, designed for smaller airports. The original from a Leningrad development bureau was equipped with vacuum tubes and was not mass-produced. In 1973, TESLA Pardubice replaced most of the vacuum tube circuitry of this model with transistors and integrated circuits. TESLA was also able to export this radar to some Soviet republics.
However, the surveillance radar could not effectively use the advantages of a radar (being able to operate even in poor visibility) because the strong attenuations caused by rain in the X-band affected its operation. Therefore, among pilots, it was considered to clear-weather radar. However, in clear weather, they flew by sight and did not need the radar.
The last radar of this type was located at the regional airfield in Karlovy Vary (Czech Republic) before it was decommissioned in 2000 and moved to the Aviation Museum in Kbely (a district of Prague).