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Army radio "R-311" (Omega) was produced since 1955. Designed to receive telegraph and telephone signals in the frequency range from 1 to 20 MHz. It is made according to a superheterodyne pattern on eight lamps of the type 2Ж27Л. Key Features: Superheterodyne with one frequency conversion. The number of subranges - 5. Modes of operation AM, CW. The frequency display is a mechanical scale. Sensitivity (AM / CW) 7.5 / 3 µV. Attenuation of the mirror channel at least 40 times. Bandwidth (at the level of 0.5 / 0.01) 300 ... 4000 Hz / 3.5 ... 16 KHz. Strip adjustment is smooth. The power source is a battery 2NKP24, vibration converter VP-3M2, battery BAS-G-80. Current consumption on anode circuits 14 mA, on the incandescent circuits 0.52 A (without lighting); 1.1 A (with scale lighting). Dimensions and weight 520x475x335 mm; 21 kg. The receiver is described in sufficient detail on the Internet.