ZIM-1 1941
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Since 1941, the Minsk Molotov Plant has produced the ZIM-1 detector radio receiver. The radio receiver is designed to receive local or powerful remote broadcasting stations operating in the range from 450 to 1900 meters to a good antenna and ground. Recommended antenna: length 40 ... 50 meters, suspension height 10 ... 15 meters, wire with a diameter of 2-3 mm. Grounding: iron sheet 60x60 cm, buried on glucose 1 ... 1.5 meters. Headphones are recommended to use piezoelectric or electromagnetic with series connection of windings, with a total resistance of 3200 ... 7000 Ohms. The receiver dimensions are 198x140x105x70 mm. Weight - 730 gr.
Documentation:
Based on information from collection of Valery Khartchenko