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Portable radio "Mountaineer RP-221" from 1990 produced the Voronezh PO "Polyus". The radio receiver is a 2-band LW and SV superheterodyne portable type of the 2nd group of complexity with battery or 220 V power supply via a remote power supply unit. Technical parameters: The sensitivity of the radio receiver to the internal magnetic antenna in the range of DV 1.5, MW 0.7 mV / m. Selectivity of at least 30 dB. Rated output power 400, maximum 750 mW. The range of reproducible sound frequencies 200 ... 3550 Hz. Powered by 4 elements of type A-343. The dimensions of the receiver are 230x56x142 mm, weight 0.85 kg. Radio "Mountaineer RP-221" is a copy of the serial radio of the third group of complexity "Mountaineer-321" which was produced since 1986.