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The main professional communications radio "R-309" (Barley) since 1967 produced the Kharkov Radio Plant them. 25th Congress of the CPSU. Optical scale. Frequency range: 1 ... 36 MHz. Sensitivity with a 4 kHz bandwidth in a telephone mode of 3 µV, telegraph 0.6 µV. Sensitivity attenuation in the image channel is at least 4 thousand times, on 6-7 subranges at least 2 tons. The signals of the inverter 10 tons. Times. The number of points of the affected reception is 20. There is a low-frequency output of 0.5 V (300 ... 3000 Hz), AGC for dual reception, an electric motor for the AFC. Receiver dimensions: 480x290x440 mm. Weight 33 kg, BP 14 kg. Powered by an alternating current network of 127 or 220 V, through an external PSU or from a 12-volt battery. A more detailed description of the receiver is available on the Internet.