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Since 1924, the detector radio LDV-7 has produced the Nizhny Novgorod Telephone Plant named after Lenin and the Leningrad Telephone and Telegraph Plant named after Kulakov. The receiver receives broadcasting stations in the range from 500 to 1500 meters. The electrical circuit of the device is mounted in a small wooden polished box, with dimensions of 230x127x123 mm. On the top cover of the receiver there are two handles: the left - the variometer, the right - the range switch. On the right are jacks for turning on phones, at the top of the jacks for turning on the detector. On the left side of the cover there are two clips for connecting the antenna and grounding. The handle of the variometer is equipped with a scale indicator divided by degrees from 0 ° to 180 °. With a good antenna and grounding it is possible to receive stations with a power of 1 ... 2 kW, which are 100 kilometers or more remote. Authorship on photos.