Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for selecting receiver gain adjustment values. In one aspect, a method includes receiving aggregate signal characteristic values (“aggregate values”) for a plurality of signals being received over active channels of a power line communications network, the aggregate values being computed based on signal characteristic values for each of the signals being received over the active channels. Using the aggregate values, a determination is made that one or more of the aggregate values have been outside of a valid range of signal characteristic values over a specified period. In response to determining that the aggregate values have been outside of the valid range, a receiver gain adjustment value is selected based on the aggregate values and a receiver gain of a receiver that receives the signals is adjusted.