FIELD: radio engineering. SUBSTANCE: device for measuring instant frequency has high frequency amplifier, "up" frequency converter, which has mixer, rejection filter and heterodyne connected in series. The heterodyne is connected with the second input of mixer. Device also has high frequency divider, the first and the second frequency discriminators with detector sections, subtraction and addition unit, comparator unit, analog-to-digital converter unit, arithmetical-logic unit. EFFECT: improved precision of measurement. 4 dwg
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