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The low-frequency generator "GRN-1" since 1985 produced the Vilnius plant RIP. The generator is used in amateur radio practice when setting up low-frequency devices. The range of generated frequencies of 20 Hz - 200 kHz. Accuracy of installation of frequency - 3%. Harmonic coefficient 3%. Irregularity of the frequency response in the frequency band - 0.8 dB. The maximum output voltage with a load of 600 Ohm - 0.5 V. Power network ~ 220 V.