Shortwave radio receiver `` R-675 '' (Onyx).
Receiving and transmitting radio equipment.The shortwave radio "R-675" (Onyx) has been produced since 1959 by the Leningrad plant named after V.I. Kozitsky. The radio was produced in two main versions: "R-675K" (shipborne) and "R-675P" (for submarines). In turn, each version had its own modifications: R-675B - for coastal radio centers, R-675BP - coastal, with a BPCh unit, R-675KM - shipborne, R-675M, R-675N - for NK, R-675PM - for submarines , R-675SB - coastal, with an SBD unit. The difference lies in the input circuits and additional functions (direct printing, ultra-high-speed operation, reception of signals from automatic communication facilities). For RP "R-675K", measures have been taken to narrow the clogging band to work in conjunction with powerful shipborne transmitters. The receiver contains 48 finger lamps. Frequency range: 1.5 ... 24 MHz. Bandwidth: 0.5 1 and 9 kHz. Sensitivity: in CW mode for R-675K - 2 μV, for R-675P - 0.3 μV; in AM mode for R-675K - 20 μV, for R-675P - 3.5 μV. Attenuation along the mirror channel: R-675K> 60 dB, R-675P> 50 dB. Dynamic range: 72 dB. Power consumption: 350 VA. Weight: radio receiver 81 kg, power supply 25 kg.
