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Radio stations "U-1 Harvest" and "U-2 Harvest" were produced from 1947 and 1954 by the Omsk Radio Plant. Kozitsky and Egorshinsky radio plant. The radio station '' Harvest U-1 '' is intended for radio communications in agriculture. It works in the range of 2000 ... 3000 KHz and was produced in several series by frequency. Each radio station has two fixed frequencies stabilized by quartz; therefore, during operation, no tuning was required. The radio station allows simplex and duplex communication. Simplex work is performed on the same frequency. Duplex communication is carried out as on a regular telephone. In this case, the transmitters of the radio stations operate at different frequencies, differing by 456 kHz. To work, you need 2 antennas: for reception and transmission. It is possible to connect the radio station to the telephone network. The radio station provides confident communication at a distance of 30 km. Radiation power is 0.75 watts. Power supply from the battery 12 V. The anode voltage is obtained from the vibration converter. Since 1954, a modernized radio station, U-2 Harvest, was produced on finger radio tubes that could also be powered by dry batteries.