Robert & Linda McGraw K4TAX wrote: > As I understand, when the bandwidth is reduce by 1/2 then shouldn't the > total audio output be reduced by 6 dB? And thus S/N be improved by an equal > amount? No, the average noise power gets reduced by 3 dB, and the signal power (within the bandwidth) stays the same. 73, Sinisa YT1NT, VE3EA