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Since 1948, the detector radio "DPH" has produced the Khimki Industrial Complex MMP. The name "DPH" means: Khimki Detector Receiver. The receiver is mounted in a box that has the shape of a console. On the upper horizontal panel are placed sockets for connecting the antenna, ground and detector. On the inclined panel there is a knob for smooth adjustment, and on the vertical part of the panel there are sockets for a pair of headphones. The receiver's wavelength range is divided into 4 parts and depends on the position of the plug and the antenna connection. Reception is possible in the range of 250 ... 2000 meters, and this is all long-wave, as well as most of the medium wave range. A part of the radio receivers were completed with silicon detectors with a fixed point, but with a device for selecting the operating point in case it gets lost. The other part of the receivers is special non-adjustable detectors with a fixed point. '' DPH '' belongs to a common type of detector receivers, in which constructive simplifications are achieved due to the greater complexity of control, ie, due to the convenience of the listener. In addition to this fundamental disadvantage, the receiver's range selector also has a purely design flaw: in the first range, in order for the socket to close, the antenna must be turned on with the help of a plug leg. If you simply shove the end of the wire into the antenna jack, as is sometimes done, then the socket may not close. It is bad that in the instruction about this feature is silent. The receiver is completed with head piezo telephones.
Based on information from collection of Valery Khartchenko