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The detector radio DV-3 (Detection, Broadcasting, 3rd model) since 1927, produced by the Moscow Electromechanical Plant MEMZA, the fine mechanics trust, the Nizhny Novgorod Telephone Plant and several other factories broadcasting stations in the range of 350 ... 1750 m (in practice, this is 300 ... 1800 m.). The adjustment is made with the help of a sectioned self-induction coil and a variometer assembled from cellular coils. The connection with the detector circuit is intermittent. The radio receiver is applicable in the presence of small interference from other radio stations, as it does not have good selectivity. It is equipped with instructions and a schematic diagram pasted on the sides of the case. In later releases, the instruction is printed in the enclosed booklet. On the top cover of the receiver there are two pairs of sockets for the detector and a telephone, three terminals for the antenna and grounding, a variometer knob with a scale in degrees from 0 to 180 ° (0 ... 100) and two switches, antenna and detector circuits with contacts. Tuning to the station was carried out by combining the antenna connection and handles with inscriptions tuning, and the receiving loudness and selectivity with a pen are connected. The price of the radio is 7 rubles 97 kopecks. The plant "MEMZA" produced and a set for the assembly of a radio receiver worth 6 rubles 90 kopecks.