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The radio detector "DP" since 1937 produced the Moscow plant "Radiofront". The receiver has a simplified electrical circuit. There is no communication switch with antenna, which is why only powerful broadcasting stations can be received. The wavelength range of 2000 ... 150 meters is overlapped with a switch to 3 positions and a plug to 2 positions. The detector is external. Headphones high impedance or piezoelectric.