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From 1959 to 1985, the Wave-Wave Coherent Radio Volna-K (plus options) was produced by the Petropavlovsk Radio Plant named after SM Kirov. '' Volna-K '' is a special telephone and telegraph radio receiver for radio communications on coastal and long-distance vessels and as an auxiliary receiver in the Navy. The receiver has 16 radio tubes and operates in 9 subbands, overlapping frequencies from 12 KHz to 23 MHz. The receiver has a control loudspeaker, headphone jacks. A double frequency conversion and a step change in the passband of the second IF of 0.5, 1.5 and 6 KHz are applied. The sensitivity of the radio receiver depends on the ranges and lies in the range from 3 to 10 µV. Power supply from an alternating current network or from a direct current through an OP-120 converter. Dimensions of the receiver 350x410x420 mm. Weight 36 kg. There were six receiver options: Wave-K, Wave-CT - tropical, Wave-K1, Wave-K1 - tropical, "Wave-K2 (receiver body is made of aluminum alloy) and Wave-3." The radio receivers in 6 variants differed in the frequency gaps between the ranges, the narrowed ranges, the presence or absence of various service functions. More information about the options of radio "Wave-K" is available on the Internet.