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The G4-18 standard signal generator has been produced since the beginning of 1965 by the Gorky Frunze Plant, and the G4-18A generator since 1971 by the Kaunas Research Institute of Radio Measuring Technology. The generator of standard signals "G4-18" is intended for tuning various radio receiving equipment. The range of generated frequencies is 100 kHz ... 35 MHz is divided into 6 subbands. Until 1965, the plant produced a similar generator, but under the name "GSS-41". The generator of standard signals "G4-18A", launched from I-kv 1971, differed from the generator "G4-18" only in a more modern exterior design.