Originally posted by sluggo:
Having the 7500 on a different breaker circuit is almost certainly your problem - there's apparently a difference between the ground potentials on the two circuits. Since the one circuit is 20A, I'd suggest plugging everything into it, if possible. That's the easy and cheap solution.
but I am pretty sure I have tried that too . . . plugging the 7500 into the Monster Surge Protector/power strip with the same results. That WAS, however, before I found the defective coaxial cord.