RADIO RECEIVER Russian patent published in 1997 - IPC

FIELD: radio engineering, transceiving communication complexes. SUBSTANCE: radio receiver displaying increased noise immunity while receiving radio pulse signals with close basic frequencies has frequency converter to which output attenuator and intermediate frequency amplifier with broad bandwidth placed in series are connected. Two parallel circuits are connected to output of intermediate frequency amplifier. First circuit has narrow band intermediate frequency filter with medium frequency f₁ and first amplitude detectors. Second circuit includes narrow band intermediate frequency filter with medium frequency f₂ and second amplitude detector, first and second resistive voltage dividers connected in parallel to outputs of corresponding amplitude detectors, first and second threshold elements which signal inputs are connected to taps of corresponding voltage dividers connected to reference inputs of threshold elements and to input of detector of automatic gain control. Its output is connected to attenuator via DC amplifier. Outputs of threshold elements are outputs of signals with frequencies f₁ and f₂ correspondingly. EFFECT: increased noise immunity. 3 dwg