FIELD: testing radio component at their manufacture and operation. SUBSTANCE: apparatus includes sine voltage generator 1, radio component 2, barrier filter 3, first adder 4, band filter 5, second adder 6, switch 7 having first comparator 8 and unit 9 with controlled transmission factor, reference voltage source 1, converter 11 of root mean square value to constant voltage, second comparator 12. EFFECT: enhanced selectivity, simplified circuit for testing non-linear distortions of radio components. 1 dwg
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