GRN-3 (Generator nizkochastotnyj) 1989
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Low-frequency generator "GRN-3" from the beginning of 1989 produced Vilnius factory RIP. The generator is intended for tuning low-frequency radio equipment in living conditions by amateurs. The generator generates sine and rectangular signals (square wave) in the frequency range 31.5 Hz - 250 kHz. The whole range is divided into five subranges. Each sub-band has twelve fixed frequencies. The output signal voltage with a load of 50 ohms is not less than 5 volts. For more information about the generator in its instruction manual.
Documentation:
Information from collection of Valery Khartchenko