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Radio "US" was produced in 1937 at one of the Moscow numbering plants. "US" stands for Universal Superheterodyne. The radio is mainly intended for use in aviation. Assembled radio on eight octal radio tubes. The operating frequency range is 175 ... 12.000 kHz. Sensitivity in telegraph mode is 1 ... 4 µV, in telephone mode 4 ... 15 µV. The intermediate frequency is 115 kHz. The selectivity in the neighboring channels is about 60 dB, and in the mirror one it is about 15 dB. Dimensions of the receiver 320x130x170 mm. Its weight is 5.1 kg. Power is supplied from the on-board network of the aircraft through the comfort platform or from another external source. Since 1938 the advanced radio receiver US-1 was produced, where the shortcomings of the previous model were eliminated. The design and design of the US-1 radio receiver, as well as the technical parameters, are the same.