FIELD: radio engineering, communication systems with pseudorandom change of working frequency. SUBSTANCE: device provides for marked increase in duration of standing of reference signal on each frequency of its adjustment program as compared with radiation duration on each of N frequencies of input signal which ensures possibility of detection of pulses across output of mixer coinciding in frequency with frequencies of output signal and their efficient suppression practically without any distortion of pulses of legitimate signal. It results in reduced probability of miss of signal and false alarms which is achievable technical result of invention. EFFECT: reduced probability of miss of signal and false alarms. 6 dwg
