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Radio "R-253" (Alpha) was produced since 1948 by the Alexander Radio Factory. The frequency range of reception is 1.1 ... 7.5 MHz, divided into 5 sub-bands. Sensitivity in TLF - 7.5, in TLG - 3 µV. Adjustable IF bandwidth from 1 to 15 kHz. Powered by a set of batteries and anode batteries or from batteries using a vibrator. The dimensions of the radio receiver are 450x285x250 mm, the mass without batteries and rechargeable batteries is no more than 13 kg.