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In Reply to: RE: Line noise from tv cable? posted by DWPC on December 07, 2014 at 12:25:10
Is your cable drop grounded? Code requires that the cable company ground the input at the service entry. They usual don't do it. I complained to Comcast and they sent out a tech who moved the drop so it entered near the electric service panel and bonded it to the electrical grounding rod - problem solved. Prior to that I was using a 75-300 adapter wired to a 300-75 adapter - both available at RS for a couple of dollars.
Edits: 12/07/14Follow Ups:
I doubt that its grounded; it enters at the opposite end of the house from my power box. It was connected before the area was incorporated and code enforcement was pretty loose. The cable co. has said they would move it to the same entry as the power several times but never follow thru.
No surprise. The enforcement of the required code is pretty lax and since no permits are required when the cable company does the install, they pretty much do what they want.
Call your cable company and tell them that they are in violation of code and that you intend to bring them to their knees if they don't fix the problem pronto. Mention that you will call your City Hall requesting that they perform a general inspection of all cable drops in the city and issue citations to the cable providers for all the violations. It may just shake them up. I suspect that if all "illegal" connections were corrected it would run into several millions of dollars in fines and costs.
Up here within a few minutes your signal would be lost and you would call for repair. They would put you on the never fix priority list and enter you on the blacklist so if you go elsewhere the new company will know.you are a trouble maker.
Don Brian Levy, J.D.
Toronto ON Canada
Hum - constant - not dependent on volume level - solved by tying satellite entry block to main service entry - 70ft 8 gauge wire.
"The hardest thing of all is to find a black cat in a dark room, especially if there is no cat" - Confucius
Here's an article on why and how your cable service needs to be bonded to the electric service ground. Eliminating hum is just a nice benefit.
I chased my tail about this for 2 years until I got a newbie technician from the cable company. On my prior calls, the techs tested this and that and blew off my suggestions that they check the location of the cable ground with respect to the service entry.
This guy listened to my suggestion and said, "Why not? I'll give it a try." It took him 20 minutes to check and move the ground. Problem solved for once and for all.
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