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The detector radio DV-4 (stands for detector, broadcasting, 4th model) has been produced at the Moscow Electromechanical Plant since 1928. The radio receiver was created on the basis of the serial model "DV-3" using the simplification method. It operates in the range of medium and long waves from 350 to 1800 m. Coarse tuning to a broadcasting station is carried out by switching the turns of the loop coil and smoothly by a variometer.