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Radio station of personal use "Signal-401" since 1993 produced the Novosibirsk plant "Electrosignal". The radio station operates in the range of 27.150 ... 27.275 MHz. Type of AM modulation. Output power 150 mW. Power - three elements of the A-316. The sensitivity of the receiver is 0.3 µV. Dimensions of the model 115x60x28 mm, its mass with batteries 260 gr. The radio station provides communication with a model of the same type at a distance of up to 5 kilometers within the line of sight. When external power is connected to 7.5 V, the power of the radio station increases to 350 mW, and the range to 10 kilometers. In the conditions of the settlement, the communication range is reduced by about three times.