Serious hum problem. Help

Bd -- that's the cheapest one I've seen so far -- good show!!

BTW - no matter what isolkator you use, make sure to ground the antenna or cable company side of the isolator to a good ground.

One other idea occurs to me. If your TV has a 3 prong plug try a cheater that eliminates the ground and see if that solves the problem. Also you may check where the cable enters the building and see if they(cable company) used a grounding block and check that connection. Just another idea.

Hi folks,

Thanks for your help. I installed a ground rod outside and connected to the cable splitter with some copper wire. Nothin' doin'. I'm not sure I set up the ground rod correctly- can someone give me a run down on how grounding a system works?

If I can't make this happen, I'll get one of the isolators you've mentioned above. Thanks again for all the help!

I had no luck with the grounding solution you're trying. I had the cable company install a new ground to the service, tested the continuity of the ground, installed another ground wire myself to the cable splitter in my listening room. None of it had any effect. The ground loop isolator recommended above was the solution - totally eliminated the hum I spent months fighting with.

One caution though, I tried multiple isolator options, including one recommended by another audiogoner that's "cobbled together" from 2 Ratshack antenna dividers, and one from Parts Express. The first didn't work at all (though I didn't use the same exact parts the other guy used . . . sorry I don't recall who), and the Parts express part suppressed bandwith causing graininess to the picture, and preventing access to the digital on demand functions of my cable service.
Here's the Parts Express isolator I tried:
http://www.partsexpress.com/pe/pshowdetl.cfm?&DID=7&Partnumber=180-075&CFID=22979&CFTOKEN=23734557
It worked effectively to remove the hum,and is only $9.85, but lacks the bandwith to handle my Comcast digital cable service (which btw is really squirrelly and act up at the slightest difficiency in inside wiring).

So, Nsgarch - while your compliments are appreciated, if I had sprung for one of the more expensive transformers months ago, I coulda saved myself hours of time I wasted fighting with penny-wise fixes ;-]

Bd -- forgive me, I failed to mention the cheap fix (i.e. any kind of 75 ohm isolation transformer, homemade or commercial) doesn't pass digital cable signals.

I knew that, just forgot to say so. I don't know how the new isolator units work or if they can even be duplicated by DIY.