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The radio for the Navy "R-676" (Depth) was produced since 1960 by the Petropavlovsk Radio Plant, PO Box 6641. Designed to work in the super-long wavelength range from 12 to 64 KHz, divided into three sub-bands. In the first two subranges there is the possibility of reception and at fixed frequencies. On a loop antenna, the sensitivity reaches 0.012 µV. Receiver dimensions 491x408x455 mm, weight 73 kg. Dimensions of a separate power supply 268x238x302 mm, weight 22 kg.