SUPERHETERODYNE RECEIVER Russian patent published in 2002 - IPC

FIELD: radio engineering; miscellaneous radio systems. SUBSTANCE: superheterodyne receiver has receiving antenna, input circuit, radio-frequency amplifier, first and second attenuators, first and second band filters, first and second signal-to-noise ratio meters, electronic switch, comparison unit, switch, heterodyne, mixer, intermediate-frequency amplifier, AGC circuit, detector, modulation-frequency amplifier, and terminal device. Electronic switch that responds to electromagnetic situation ensures passage of signal of higher signal-to-noise ratio at this or that frequency to mixer wherein this signal is converted by means of heterodyne into intermediate-frequency signal. EFFECT: enhanced signal-frequency search range without extending heterodyne frequency control range by using mirror receiving channel. 3 dwg