Detector radio `` DV-3 ''.
Radio and electrical constructors, sets.Radio receiving devicesThe detector radio `` DV-3 '' (Detector, Broadcast, 3rd model) since 1927 produced by the Moscow Electromechanical Plant `` MEMZA '', the precision mechanics trust, the Nizhny Novgorod telephone plant and several other factories - is designed to receive local and powerful distant broadcasting stations in the range of 350 ... 1750 m (in practice, 300 ... 1800 m.). Tuning is done using a sectioned self-induction coil and a variometer assembled from honeycomb coils. The connection with the detector circuit is intermittent. The receiver is applicable in the presence of small interference from other radio stations, since it does not have good selectivity. Supplied with instructions and schematic diagrams glued to the sides of the case. In later releases of the receiver, the instructions are printed in the enclosed brochure. The top cover of the receiver accommodates two pairs of sockets for a detector and a telephone, three terminals for an antenna and grounding, a variometer knob with a scale in degrees from 0 to 180 ° (0 ... 100), as well as two switches, antenna and detector circuits with contacts. Tuning to the station was carried out by a combination of antenna connection and knobs with tuning inscriptions, and the receive volume and selectivity were with a communication knob. Receiver price 7 rubles. 97 kopecks. The MEMZA plant also produced a set for assembling a receiver worth 6 rubles. 90 kopecks.
