FIELD: radio engineering and electric communications. SUBSTANCE: system has transmitting section incorporating at least modulator, carrier generator connected to modulator, and output channel-interface unit; receiving section including at least series-connected input channel-interface unit, line circuit, and signal discriminator, carrier generator connected to line circuit and/or to signal discriminator. Each carrier generator is made in the form of synchronized oscillator whose synchronizing input is connected to matching-unit output; inputs of matching units are used for connection to power supply mains; synchronized oscillators are tuned to frequency of mF, where F is frequency of power supply mains; m is harmonic chosen between 10 and 20 000. EFFECT: enhanced noise immunity. 2 dwg
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