the invention is a novel method and transmission system for mitigating the adverse effects of amateur radio interference on digital signals transmitted across a twisted pair and reducing the interference caused by the digital signals to amateur radio communications . at the heart of the invention is strategical placement of the frequency spectrum of the transmitted signal relative to the center frequency of the ham bands . in particular , the signal spectrum is permitted to straddle one or more ham bands , which permits the transport of high data rates with a single carrier . at the transmitter , the signal is filtered with a real - valued symmetric baseband filter in order to remove signal content in the ham bands . at the receiver , the signal undergoes adaptive interference cancellation , followed by processing through a decision feedback equalizer . in some cases , the signal is filtered at baseband with a real - valued filter to remove interference in the ham bands . in the context of a telecommunications access system , the inventive technique can be applied to either or both directions of traffic flow , i . e ., downstream and upstream , and multiple carriers can be added to increase capacity in any given direction .