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The telegraph radio station Sever has been produced since 1941 by the Leningrad Kozitsky plant. Three lamps. It was produced in versions with frequency bands: 3.62 ... 12.25 MHz, 3.62 ... 6.25 MHz, 2.22 ... 6.66 MHz and 2.56 ... 5.77 MHz . Transmitter output power 1.2 watts. Power battery-battery. PC dimensions are 180x150x100 mm. Weight without power 3 kg. Tuning to the frequency was carried out according to the graphs, since the scales of the receiver and transmitter had conditional degrees. An "inclined beam" antenna is a 12 m long wire that was dropped on any tree or structure and a sectioned counterweight positioned at a height of 1 m from the ground in the direction of the correspondent. When choosing the optimal frequency, it was possible to ensure reliable communication with the radio center, which had the main equipment and the directional antenna, at distances up to 700 km. In 1942, the radio station was modernized and was produced under the name "Sever-bis" (reception 2 subranges: 2.22 ... 6.66 MHz, transmission 2 subranges: smooth 2.56 ... 5.77 MHz and three stabilized frequencies. Output power about 2.5 watts.