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The radio PR-4P was produced presumably since 1957 by several enterprises of the country. The receiver is aviation, but was also used as a liaison. This superheterodyne with a single frequency conversion. IF is 112 kHz. Frequency range: 175 kHz - 12 MHz, divided into 5 sub-bands. Sensitivity 10 µV in SLT and 4 µV in SLT. The adjacent channel selectivity exceeds 90 dB. The radio receiver was powered from a 27 Vmformer, providing a voltage of 200 V to power the anodes and 6.3 V to power the filament.