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The heterodyne resonance indicator "GIR-1" from I quarter 1973 produced Vyborg instrument-making plant. The heterodyne resonance indicator '' GIR-1 '' is intended for checking and adjusting amateur radio or television equipment. The device works as a high-frequency generator with and without modulation, as a low-frequency generator and a resonant wave meter. The operating frequency range of the device '' GIR-1 '' is from 400 kHz to 38 MHz.