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Topic:
picture noise
This thread has 5 replies. Displaying all posts.
Post 1 made on Saturday January 26, 2002 at 08:34
BCS443
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I have an audio/video distribution panel in my home that directs cable for satellite and cable to 14 televisions. When I have lights on in the home I get a rolling noise line that runs horizontal on the screen. What can I do about this problem? Thank you, Barry [email protected]
Post 2 made on Saturday January 26, 2002 at 09:24
John Pechulis
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July 2001
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Just as a test, disconnect the main cable service from the distribution system and TEMPORARILY disconnect the cable ground where it enters the house. If the noise disappears, you have a grounding problem.

Pick yourself up a coax ground-loop transformer and install it on the main cable service before it enters the distribution center.

These are available from www.partsexpress.com

If you can't find one. You could hop down to your local Radio Shack and pick up two 75-300 ohm antenna transformers, wire them back to back, and install inline like described above.

Hope this helps.


JJP

This message was edited by John Pechulis on 01/26/02 19:14.09.
Post 3 made on Saturday January 26, 2002 at 10:03
Matt
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1,802
Wow, only when you have the lights on? I would check your AC wiring with a circuit tester you can get at radio shack or most hardware stores.

Sounds like you may have a hot conductor attatched to ground somewhere in your house. While watching your tv, turn off your breakers one by one until you find the offending one, then you can track from there.

Let us know, I'm curious about this one.
Post 4 made on Saturday January 26, 2002 at 13:58
Tony Golden
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651
I've seen faulty CATV amplifiers, or their power supplies, cause similar problems. Never seen it related to lights turning on, though...
Post 5 made on Saturday January 26, 2002 at 14:11
Dale Schultz
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January 2002
17
Some older TV's can send alot of power out on the cable ground. Is there a tv in your house that only gets watched at night? If so try removing that tv and see if the problem remains. If it's gone you can hook the tv back up using a ground breaker as mentioned before.
Post 6 made on Saturday January 26, 2002 at 20:43
Larry Fine
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On 01/26/02 09:24.55, John Pechulis said...
Pick yourself up a coax ground-loop transformer
and install it on the main cable service before
it enters the distribution center.

One caveat: some transformers do not provide true isolation from input to output; i.e., there may be a D.C. connection. To be sure, use an ohmmeter to test between one 300 ohm terminal and the coax pin and then the shield, and then from the other 300 ohm terminal to the coax pin and shield. You're looking for no conductivity.

Larry
www.fineelectricco.com

This message was edited by Larry Fine on 01/26/02 20:46.05.


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