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The portable transistor radio "Sputnik" from the II quarter of 1957 produced the Voronezh Radio Plant. The satellite model is one of the first portable transistor receivers in the USSR. The radio receiver is assembled on a superheterodyne circuit on 7 transistors, and only 3 transistors are used in the LF amplifier. The feature of the receiver is low-voltage power supply, only 5 volts, although performance remained in the interval 4.7 ... 5.5 volts, which caused the use of batteries, they keep the voltage almost constant, giving only current. Another feature of the receiver was the presence of a solar battery in it, which recharged the batteries from the scattered or direct sunlight of the sun when the receiver was off, and from direct sunlight even during transmission pauses, allowing it to work without discharging the batteries. The receiver is designed for loud-speaking reception of radio stations operating in the range of long and medium waves. The sensitivity when working with an internal ferrite antenna is 2000 ÂµV per DV and 1000 ÂµV CB. The adjacent channel selectivity is 26 dB in the Far East and 20 dB in the NE. On the mirror channel 20 dB. IF 465 kHz. When the input signal is changed by 30 dB, the automatic gain control provides a voltage change at the output of 6 dB. Rated output power 100, maximum 130 mW. The frequency range of the reproduced loudspeaker 0,25GD1 - 250 ... 3000 Hz, with uneven frequency response - 18 dB. The average sound pressure is 1.5 ... 2.0 bar. Powered by 4 compact zinc-cadmium batteries TsNK-0,4 with a total voltage of 5 volts. Duration of continuous operation from freshly charged batteries 50 hours. The case of the receiver is made of pine dried wood, impregnated with an alcoholic solution of cellulose and covered with decorative plastic. The dimensions of the receiver are 185x125x49 mm, the weight with batteries is 950 g. The price of the model is 514 rubles (in money of 1957). The receiver "Sputnik" was an experimental and low-volume (~ 1000) units. In 1959, the receiver was upgraded, but did not go into serial production.By design and parameters, the receiver was very successful and remained the leader among subsequent similar receivers, for several more years.