FIELD: radio engineering. SUBSTANCE: device for measurement of parameters of frequency-modulated signal has N channel each including band-pass filter and amplitude-phase detector, signal selection unit, synchronization signal former, synthesizer of frequency spectrum, N-channel unit of amplitude-phase correction, N-3 networks each composed of comparator, unit of input keys, computer and unit of output keys, units computing average value of modulation index and average value of number of channel of carrier and adder. EFFECT: capability for evaluation of modulation index of continuous radio signal with wide-band frequency modulation with uncertain position of carrier frequency and known value of modulation frequency, increased accuracy of device. 6 dwg, 1 tbl
