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The signal generator "SG-1" was produced since 1954. The device is intended for tuning and adjusting radio receiving equipment in the frequency range from 13 to 330 MHz. Error setting frequency of 1.5%. The device operates in the following modes: continuous generation; internal sinusoidal modulation with a frequency of 1000 Hz with a modulation factor from 10 to 80%; external sinusoidal modulation with frequencies from 100 to 8000 Hz; external pulse modulation with pulses of 10 microseconds or longer. The output voltage at the end of a coaxial cable with a characteristic impedance of 100 ohm smoothly varies from 4 µV to 20 mV. An external voltage divider with a division ratio of 1:10 is attached to the device. The basic error of the voltage setting at a frequency of 40 MHz is 25%. The device is powered by AC mains 110, 127 and 220 V.