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In Reply to: New(?) twist on ground loop hum/digital cable posted by cleger on December 28, 2001 at 10:39:36:
You can try using a cheater plug, but my experience with CATV induced ground loop hum is that it may not completely solve the problem. I am not familiar with digital cable, but would it be possible somehow to isolate the signal on the downstream side of the cable box (that is, after it has been decoded into the video signal)?I do use cheater plugs routinely in my system, but many people cannot stand the thought of using them. I guess it's a matter of risk tolerance. My feeling is that the risk is not particularly great with typically well built high end equipment.
Todd
Follow Ups:
Thanks TOdd,I don't really think the cheater plug will help either...
Unfortunately, I can't isolate the ground downstream of the box, because the coax exisits only upstream (downstream is S-video & dig. audio) and even if I could, it wouldn't help, since the ground would be connected with my system by then.
After a little more reading, I now think the problem is that both the transformer and capacictor isolators won't pass the higher frequencies used by the digital portion of the cable signal.
I'm using 0.01uF caps... I wonder if different values might work better? The author of the article I mentioned hints at it... maybe another trip to Radio Shack is in order...
Thanks,
Chris Leger
the ground loop is actually caused by voltage on the shield (ground) side of the coaxial cable. the noise actually shows the ground is not properly made at the entrance of the cable into your home. have the cable company come back (for free) because they did not properly install the cable. they may have installed a copper grounding wire to the entrance block but either it is not screwed down tightly at one end or both, or the wire's gauge is too small for the distance it is going to the ground, or perhaps it is not attached to a real ground at all. no matter what the problem is, the noise indicates there is voltage on the house side of the ground. the voltage may not be a danger to you now, but it does indicate that no matter what you've done to eliminate it with a transformer, or a any other method, the cable is still not properly installed and all you've done is cover up a problem, not repair it.
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