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Since 1927, the P-3 detector radio receiver has been producing the Moscow Telegraph Plant (formerly Morse). At that time, it is the best detector receiver on the market. The receiver is a small rectangular wooden box, pasted over with granitol. It is designed to receive radio stations in the range from 300 to 1800 meters. Tuning is performed by changing the cellular coils and the air variable capacitor, as well as by switching the capacitor and coil from a long-wave circuit to a short-wave circuit by swapping a special plug-in connector in the sockets. Communication with the detector circuit inductive - is changed by expanding the coils. Due to the possibility of regulating the connection between inductances, the radio receiver has a very high selectivity when receiving remote radio stations. For complete overlapping of the range four cellular coils are included in the package, two for a certain part of the range. The main setting is a variable capacitor. Radio allows you to receive radio stations remote over a distance of 700 kilometers. Price 18 rubles.