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Shortwave radio "R-675" (Onyx) was produced since 1959 by the Leningrad plant them. Kozitsky. The radio was produced in two basic versions: "R-675K" (ship) and "R-675P" (for submarines). In turn, each version had its own modifications: R-675B - for coastal radio centers, R-675BP - coastal, with BPH unit, R-675KM - shipboard, R-675M, R-675N - for NK , R-675SB - onshore, with a SBD unit. The difference lies in the input circuits and additional functions (typing, super-speed, receiving signals of automatic communications). For RP "R-675K" measures have been taken to narrow the blocking band to work with powerful shipborne transmitters. The receiver contains 48 lamps of the finger series. 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 in the mirror channel: Р-675К"u003e 60 dB, Р-675П"u003e 50 dB. Dynamic range: 72 dB. Power consumption: 350 VA. Weight: radio 81 kg, power supply 25 kg.