FIELD: communication equipment, in particular, duplex RF communication. SUBSTANCE: device has base station and user set and uses device and method for attenuation of mutual noise. Base station receives return line signal from user set using return line frequency and transmits direct line signal to user set using direct line frequency. After receiving return line signal from user set, base station detects quality metrics for return line frequency. If metrics is less than threshold value, then base station and user set perform signal shift to spare return line frequency using same direct line frequency. EFFECT: decreased effect of penetration noise. 10 cl, 6 dwg
