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The desktop transistor radio Solnechny-2 was developed in 1961 by the Leningrad NIIRPA named after Popov. The feature of the receiver is power from a small-sized portable solar battery together with a battery. When the receiver was turned off, the battery was recharged in daylight, this was enough for the receiver to function normally for 2 ... 3 hours a day. If you need long-term listening, you had to direct the light of the sun or lamps of 60 ... 100 W to the solar battery. The receiver is assembled on 9 transistors using a simple superheterodyne circuit. Ranges DV and ST. When working with a ferrite antenna, the sensitivity of the receiver is 5 mV / m. The adjacent channel selectivity is 12 ... 14 dB. Rated output power 50 mW. The frequency range of sound pressure 250 ... 4000 Hz. The receiver has an input for connecting an external pickup. On the left there is a power and volume knob, then an adapter input button, a DV range, a CB range, and a tuning knob on the right, with numbers printed on it, which are the relative scale of the receiver. Dimensions of the receiver 263x187x71 mm. Weight 760 gr. The radio was made in a prototype. The figure also shows the fan, which was supposed to be used to cool the radio listener when the sun was hot.