whom do i get to fix a ground loop hum?

I am using this:
http://www.jensen-transformers.com/datashts/vrd1ff.pdf

It has cleared up the hum on my home stereo (with cable box) and on my PC's speakers (cable modem). However, it messes with the Comcast digital music channels. I am trying find out why...

Re: http://www.jensen-transformers.com/datashts/vrd1ff.pdf

I just spoke with a Tech at Jensen. He advised me to move the transformer closer to the outside feed. I removed the wall plate and installed it behind there. The DMX channels came back!!!!

PS It's only $60.

Do you still get the hum if you unplug the cable from the wall outlet?

thanks men, i do prefer the issue to be fixed, not just covered, but, who knows if the cable tech will be willing or even know how to change the ground link. i will contact them. if not, the magic will be the solution, thank you all bcuz i was not aware of the product.

You can get a CALRAD isolation transformer (CALRAD part 75-5040) for less
than $6 (not $60 !!!), works like a charm and is used by several people on
Agon and Asylum.

For some reason all previous threads where it has been recommended have
been removed. Anyway, I ordered mine from a local electronic shop and it
took 2 weeks to arrive. You can find several online sellers by using Google.

Good luck!