KRU-10 (Radiopriemnik) 1958
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The stationary transistor radio "KRU-10" from 1958 produced the Murom radio plant. The radio receiver is designed to work with the collective farm radio unit "KRU-40". The radio receiver is made according to the superheterodyne circuit on 10 transistors and 3 germanium diodes. The receiver is designed to receive in the wavelength range from 150 KHz to 12.5 MHz (C 2000 to 25 m), which are divided into six sub-bands: LW, SW and four HF (70 ... 50, 41, 31 and 25 m). The mass of the receiver is 6 kg. Sensitivity to LW, MW 35 mV, KV 25 mV. Adjacent channel selectivity is 40 dB. The weakening of the rock channel in the DW, ST 40 dB, KV 30 dB. IF 465 kHz. The audio frequency range is 100 ... 3500 Hz. Manual gain control works within 30 dB. Powered by any DC source with a voltage of 12 V. The current consumption is 15 mA. Output power is 1 mW at a load of 600 ohms. The receiver contains a UHF cascade, a frequency converter with a separate local oscillator, 2 UPCH cascades, a diode detector, UPT, 2 ULF cascades, a ULF cascade of control telephones, a separate direct gain receiver on one transistor. It is designed to receive wire broadcasting at a frequency of 31.5 kHz. Its RF bandwidth is 8 kHz, sensitivity 5 mV, current consumption 4 mA. UPT controls the AGC, when the signal changes by 60 dB, it provides a change in output voltage by 6 dB. Structurally, the radio is divided into 3 separate blocks. The high frequency block consists of a seven-section drum-type switch, a built-in KPI block and a board on which UHF transistors, a local oscillator and a converter are located. The second block includes the amplifier and direct gain receiver. The third block has ULF cascades. The RF-IF blocks are located so as to exclude their mutual influence. The receiver has sockets for the sound pickup, microphone and other sources of the low-frequency signal.
Documentation:
Information from collection of Valery Khartchenko