i have a 148 cobra that seems to have what sounds like ac ripple in the am/ssb audio.. i have swapped out power supplies with 3 different supplies and the 148 still has the rippling sound in the audio...it's more predominate in the ssb but is there on am as well...this is with a stock cobra mike as well..thought it may have been a grounding issue but not sure.. this issue has shown upon a rci 2950 and a emperor 5010 as well.ssb and am ...i have a courier 40d that when used on dc power with these power supplies shows no sign of distortion in ssb or am........and ideas??
john
john