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The special radio receiver PR-56 has been produced since 1956. Special shortwave transceiver portable telegraph radio station "Rion" is designed for simplex and half duplex two-way communication. The radio station operates in a smooth frequency range from 2.5 to 10 MHz (transmitter) and from 2 to 12 MHz (receiver '' PR-56 ''). The radio receiving device of the radio station allows to perform work in the self-excitation mode of the master oscillator or with quartz stabilization (quartz can be used on the main and second harmonics) in the entire frequency range. The switching scheme of the radio station allows simplex operation using one antenna as well as half-duplex operation; in this case, an additional antenna must be deployed for the radio receiver. The sensitivity of the receiver in telegraph mode is 5.5 µV. Transmitter power 5 ... 10 watts. Subsequently, there was probably a modernization of the radio station, since the radio receiver had an index "A" added to the name "PR-56". Accurate information on this issue yet.