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Portable radio receiver "Alpinist-420" in 1982, expertly released the Voronezh radio plant. '' Mountaineer-420 '' works in the ranges of long and medium waves. Powered by batteries A-343 or KBS-L-05, as well as from the network, through a remote power supply. The sensitivity of the receiver in the Far East - 1.8 mV / m, NE - 0.8 mV / m. Selectivity - 30 dB. Rated output power 0.5, maximum 0.9 watts. Frequency range 200 ... 3550 Hz. The dimensions of the RP - 261h166h71 mm. Weight 1.5 kg. Price 38 rubles. Since 1984, the plant produced the same receiver with the name "Alpinist-320" and with a built-in power supply unit.