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Radio "Nedra-1" was produced since the beginning of 1960 by the Omsk instrument-making plant named after Kozitsky. The portable tube single-band radio station '' Nedra-1 '' makes it possible to carry out confident search-free simplex radio communication with stations of the same type at a distance of up to 30 kilometers with an antenna of the type '' tilted beam '', with a pin antenna with a length of 1 meter and a distance of up to 5 kilometers. The radio station was produced with indices A, B, C and D denoting a fixed operating frequency. All four frequencies are in the range from 1600 to 2000 KHz. The sensitivity of the radio station 0.5 mV. RS power in the antenna for transmission reaches 0.3 watts. The radio station is powered by a dry special battery with voltages of 1, 2, 15, 60 and 120 volts.