the USSR, the 1950s (?). Excellent structural condition. Performance we have not tested. The original. R-311 - military HF radio. It is intended for receiving Telegraph and telephone radio signals in frequency range from 1 to 20 MHz. The radio made by superheterodyne circuit eight lamps of GL. The scheme of the radio includes input circuit, one amplifier voltage high frequency, mixer, first heterodyne two amplifier voltage intermediate frequency, the second lo, the second mixer/detector and the amplifier voltage low frequency. Distinctive features of the scheme radio are: local oscillator with constant overlapping frequency on all bands, the presence of quartz filter in the path gain inverter with smooth adjustment of the bandwidth, the stabilization of quartz frequency of the second oscillator, which is used as quartz calibrator correction calibration.
Excellent external condition.
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