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KV radio station for the Navy "Granit" was produced in 1957 in Ukraine by the plant number 22. Designed for two-way radio communications by telephone and telegraph. Assembled on 11 battery finger lamps. It is powered by batteries directly and through a vibration converter. The frequency range is 3.5 ... 4 MHz. The sensitivity of the receiver is 10 µV. Transmitter output power 100 mW. Types of work CW and AM. Used antennas such as "pin", "beam". Since 1960, the Granit-M radio station has been produced with universal power supply, from batteries and from the AC network. Both were used in the Navy in the intelligence of the Marine Corps and as training. The communication range with the same type radio station in AM on a whip antenna is up to 3 km, on a "beam" type antenna up to 5 km, CW up to 5 and 8 km.