Signal 1964
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Since 1964, the portable Signal radio has produced a limited series of Kamensk-Ural instrument making plant. Radio "Signal" is built on a superheterodyne circuit on 7 transistors. According to the wiring diagram, it is similar to the radio sets "Neiva" and "Jupiter", differing in appearance, built-in clocks, which, in addition to the clock function, allow you to automatically turn on the receiver at a specified time. Radio "Signal" has ranges of LW and ST. The sensitivity of the receiver in the DV range - 1.5 mV / m, SV - 0.8 mV / m. Selectivity on the adjacent channel with 10 kHz detuning in the DV ranges is 24 dB, CB - 20 dB, specular one - 30 dB. When the input signal changes 20 times due to the AGC, the voltage at the ULF input changes by a factor of 2. Food is carried out from the battery like "Krona". Loudspeaker 0.1GD-12. You can connect a TM-4 telephone to the receiver, and the loudspeaker is turned off. There is a jack for an external antenna. The nominal output power of 60 mW remains at a decrease in power to 7.2 volts. Quiescent current does not exceed 4 mA. The dimensions of the receiver are 121x77x36 mm. Weight 400 gr. Includes leather case. The price of the receiver is 36 rubles 83 kopecks.
Documentation:
Information from collection of Valery Khartchenko