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In Reply to: Re: Will Monster Power Strip Solve Ground Loop Problem? posted by db on June 05, 2001 at 17:28:00:
I have noticed when bringing in an outside source, like DSS, or Analog Sat systems, and even cable, that their ground potential can be different from your power company's ground. This can create the hum. Trouble is, if you lift ground, you stand a better chance at getting zapped by lightning, because the cable is on a pole somewhere, same for the SAT, and DSS, on a roof or out in the yard. You could try to get a better ground by driving rods deep into the earth,(9 to 12 feet, interlocking brass rods, local RS) and connecting the cable ground there, instead of where the cable company grounded, minimal at best. It still might not remove the noise. Also, the cable may be sending the noise with their signal, at the headend, they use consumer SAT recievers, with -10db unbalanced outs, a bunch of noise originates there too, because it is boosted up to broadcast level for their modulators, without interfacing, thus raising the hum with it. Another thing to try, get the remote box away from the TV, and see if that helps.
--A babbling db
Follow Ups:
Hey thanks. A question: do you know if the Xantech "ground breaker" will lift the ground, as you describe? (See http://www.hometech.com/video/atten.html) I live in Florida and lightening is definitely an issue.Cheers,
Ramon
Not sure about it's surge suppression capabilities. Cheap too! I also put one on my cable modem with no problems (didn't have a problem there, just did all TV's plus modem - probably overkill).-- Greg
That is a possible fix, this is a transformer, You would want to keep the vcr/tv end of that as short as possible. The price is right. My question to this would be, if it is a common condition, why is this not an internal component of any tv, vcr, or sat system? Or why is this not supplied?, OK cost, but if it is an automatic improvement to products (isolation, less Hum, why is it not there? We have all kinds of sat systems here at work, cable, and DSS. Not once, on any installation has something like this been used. Because it is a transformer, and being RF, it might knock the signal down, or cause channel bleed, or introduce other problems, like RF noise. But worth a try.
--db
Hmmm... Good question. In my frustration I just assumed that audio and cable companies were not dealing with the issue because they are evil :-) Better to let people think it's their fault (e.g., bad wiring) or spend $100 for a solution. But maybe there will often be drawbacks to an inexpensive solution (I'll let you know once I get the Xantech gadget).On the other hand, my limited experience suggests that most people are willing to accept audio hum, if it's not too loud. When the cable guy came over to my place, not only did he not understand the problem, he also seemed to think it wasn't a big deal. He said something like, "so you're getting good sound out of the TV, right?" (where 'good sound' means inteligible sound). If most people don't care about hum, then there's little incentive to provide a solution -- except for those who care and WANT to pay $100 for it!
Cheers,
Ramon
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