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The combined educational generator "GUK-1" was produced from I quarter of 1980. The signal generator "GUK-1" is designed to configure household radio receivers. It operates in the range of 150 kHz to 28 MHz and smoothly covers the entire range with the help of five sub-bands. The frequency setting error is no more than ± 5%. The generator provides smooth adjustment of the output RF voltage from 0.05 mV to 0.1 V. The generator provides signal generation without modulation and with amplitude modulated sinusoidal voltage with a frequency of 1 kHz and a depth of 30%. The output impedance of the generator is not more than 200 ohms. The device also has a low-frequency signal generator that generates five fixed frequencies: 100 Hz, 500 Hz, 1 kHz, 5 kHz and 15 kHz. The tolerance of the frequency of the low-frequency generator is ± 10%. The output impedance of the generator is 600 ohms. The output voltage of the low-frequency signal is continuously adjustable from 0 to 0.5 V. The device is powered from the Krone battery. Authorship on photos.