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11-08-2004, 12:33 PM
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#1 of 26 
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Chris Steltz
Member
Location: Lancaster, PA
Join Date: Sep 2004
Local Time: 01:17 AM
Local Date: 09-08-2008
Posts: 39
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DIrectv Hum and Grounding Question/Problem...
So I had DTV installed this past weekend and in my home theater I am getting a low hum when my Directv DVR is hooked up to my Yamaha reciever. I have hooked it up in various other inputs including directly to the TV and i still get a hum through my speakers. Is this a grounding issue with the Satellite dish? I noticed the guy ground the dish to the base that the dish mounts too. Any help would be appreciated.
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11-08-2004, 12:45 PM
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#2 of 26
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Join Date: Nov 2003
Local Time: 01:17 AM
Local Date: 09-08-2008
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Audio or video hooked up? (Many AVR's allow you to switch video through them)
If it is just Audio, try optical. I have had this fix this sort of issue.
Ground loops are tough, sometimes just lifting a ground can solve it. There are AC line devices out there that will help with it as well.
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11-08-2004, 12:56 PM
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#3 of 26
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Member
Location: Columbia, MD
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If you get frustrated you can also have the installer come back. You should get what you pay for and a bad install shouldn't be your problem. I would try to rule out as many other causes as you can before calling them though.
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11-08-2004, 02:22 PM
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#4 of 26
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Chris Steltz
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Location: Lancaster, PA
Join Date: Sep 2004
Local Time: 01:17 AM
Local Date: 09-08-2008
Posts: 39
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It is just when I hook up the video. I called the installer back just becasue I dont want to deal with it but im trying to figure out 100% what it is so he knows what to fix. Can thos dish's be grounded to themselves like he did?
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11-08-2004, 04:07 PM
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#5 of 26
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Member
Location: Poughkeepsie, N.Y.
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Local Date: 09-07-2008
Posts: 1,196
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The coax that comes down from the dish should have a grounding wire with it. That ground wire should go to the same ground that the house electrical panel uses. A cold water pipe will do the trick as long as it's copper and not PVC plastic.
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11-08-2004, 04:14 PM
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#6 of 26
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Member
Location: Katy, TX
Join Date: Aug 1999
Local Time: 08:17 PM
Local Date: 09-07-2008
Posts: 6,484
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Quote:
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I noticed the guy ground the dish to the base that the dish mounts too.
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The dish’s ground should go all the way back to the ground stake at the electrical panel. Grounding it anywhere else can result in a ground loop. And apparently it did in this case.
Quote:
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Ground loops are tough, sometimes just lifting a ground can solve it.
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Not a good idea, really. It’s best – and safest – to find and solve the ground loop problem.
Regards,
Wayne A. Pflughaupt
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11-08-2004, 05:31 PM
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#7 of 26
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Join Date: Nov 2003
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Local Date: 09-08-2008
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Very true Wayne....
But sometimes they can be such a bare to figure out. Lifting a ground starts to look extremely plausable. lol
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11-08-2004, 09:01 PM
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#8 of 26
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Member
Join Date: Mar 1999
Local Time: 03:17 PM
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There should be an outside wall mount for the DTV cable. It will end in an 'F' connecter and a new wire will go into the house. There should also be a screw there that isn't doing anything. Run a wire between that and the house ground, and see if the hum goes away.
Since we are all guessing that is it, call them back and have them fix it!
Glenn
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11-09-2004, 03:33 PM
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#9 of 26
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Member
Join Date: May 2001
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not sure, but wouldn't unhooking the coax from the back of the directv receiver verify if that's the cause of the ground loop hum?
since that would take the problematic coax out of the equation?
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11-09-2004, 04:35 PM
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#10 of 26
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Member
Location: Katy, TX
Join Date: Aug 1999
Local Time: 08:17 PM
Local Date: 09-07-2008
Posts: 6,484
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Yes, that would tell you if the coax is the problem - i.e., not grounded in the right place.
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