FIELD: radio engineering. SUBSTANCE: modulation method for transmission of information signals in long-wave range consists in modulation of first carrier frequency with information signals by method of quadrature double-sideband modulation, in isolation of signal with single sideband and unsuppressed carrier, in conversion of said signal to intermediate frequency signal with one or two sidebands and in conversion of intermediate frequency signal to long-wave range by way of mixing with frequency emitted by heterodyne. Circuit of information signal transmission and information signal receiver are designed correspondingly for transmission and reception of mentioned signals. EFFECT: increased efficiency and diminished probability of distortion of signals by interference. 4 cl, 3 dwg
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