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Portable transistor radio "Quartz-403" from 1972 produced Kyshtym radio plant. The model is assembled at the base of the radio "Sokol-403" and is designed to receive radio stations in the bands DV and ST. Radio reception is made to an internal magnetic or external antenna. The sensitivity at the reception to the internal antenna and the output power at the detector of 5 mW and a signal-to-noise ratio of 20 dB is 3.0 mV / m in the DV range, 1.0 mV / m in the SV range. The adjacent channel selectivity is 20 dB in the DV range and 16 dB in the CB, attenuation of the mirror channel in both bands is about 20 dB. The AGC system provides a change in the voltage of the output signal by 10 dB, with a change in input by 26 dB. The range of volume adjustment is 40 dB. The working frequency range of sound is 450 ... 3150 Hz, the average sound pressure is 0.15 N / m2, the nominal output power is 100 mW. Powered by a Krone battery or a 7D-0.1 battery. The efficiency is maintained when the voltage drops to 5.6 V. The dimensions of the radio receiver are 170Ñ…100Ñ…40 mm, weight 480 g (without battery).