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Small-sized radio receivers Svirel-2, Svirel-402 and Svirel RP-402-1 produced from 1983, 1989 and 1991 the Orsha plant Red October. Receivers' Piglet-2 '' (402) are designed to receive broadcasting stations in the range of long and medium waves to an internal magnetic antenna. The power of any of the radio receivers is carried out from three elements of type 316. The duration of operation of any of the receivers, when powered from elements of type 316, is 40 ... 45 hours, with an average volume. Radio "Pipe-2" was a further modernization of the serial one-band receiver "Pipe", produced since 1981. Receiver '' Pipe-402 '' replaced '' Pipe-2 '', and receiver 'Pipe RP-402' 'produced since 1986 is the same radio' Pipe '-402', but with the prefixed RP according to the new GOST -y Receiver "Pipe SPM-402-1" upgrade of previous models. TX: Ranges: DV - 148.0 ... 285.0 kHz, SV - 525.0 ... 1607.0 kHz. Sensitivity in the range of DV - 2.5 mV / m, SV - 1.5 mV / m. 20 dB selectivity. The maximum output power is about 100 mW. The frequency range of the sound pressure 450 ... 3150 Hz.