FIELD: radio engineering. SUBSTANCE: device has emphasis input unit 213 for primary suppression of inter-modulation signal, which is produced by amplification of RF signal in main power amplifier 214, by means of generation of harmonic frequencies corresponding to input RF signal, and emphasis signal by means of joining RF with harmonic frequencies. In addition method involves regulation of direct effect of secondary suppression of inter-modulation signal by means of suppression of RF signal and output signal of main power amplifier 214 using first delay line 217 and signal suppression unit 219, detection of inter-modulation signal distortion, amplification of detected distortion as error using error amplifier 222, and joining amplified inter-modulation signal with output signal of main power amplifier 214 after second delay line 215 in main channel. Regulation is achieved by means of signal selector 235, signal detector 236, controller 237, for generation of control signals for switching signal detector 236, synchronization of inter-modulation signals corresponding to main power amplifier 214, generation of control signals for attenuation and control of phase of respectively first, second and third attenuators 211, 220 and 315 (not shown), and phase shifters 212, 221, and 316 (not shown). EFFECT: detection and suppression of inter-modulation distortion. 3 cl, 20 dwg
