FIELD: radio communication systems. SUBSTANCE: transmitting unit of multifrequency radio communication system has section generating synchronizing signal for reception of control signal for selection of bandwidth determined in advance, multiplexing section, low-pass filter, digital-to-analog converter, switch. Achieved technical result lies in reduced energy consumption, in filtration of signal of expanded spectrum of multifrequency system by use of single low-pass filter and by variable control over rate of discretization during conversion of digital signal filtered by lower frequencies to analog signal. EFFECT: reduced energy consumption and filtration of signal of expanded spectrum of multifrequency radio communication system. 6 cl, 2 dwg
