FIELD: measurement technology; mobile communication equipment. SUBSTANCE: frequency discriminator has quartz-crystal discriminator, resistor, coil that forms parallel oscillatory circuit together with resonator, capacitor C0, amplitude detector, capacitor C2, microammeter connected as voltmeter and designed to check level of frequency-modulated signal applied to input for desired voltage level; amplitude-frequency response characteristic of quartz-crystal resonator is chosen between its series and parallel resonance frequencies. EFFECT: enhanced accuracy of low frequency deviation measurements. 1 cl, 5 dwg
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