Breaking ground loop hum caused by satellite dish... [message #1762] |
Mon, 23 May 2005 09:57 |
Mr Vinyl
Messages: 407 Registered: May 2009
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Illuminati (1st Degree) |
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Hi, I am getting a ground loop hum from a recently installed satellite dish. Does anyone know how to break the ground on a satellite signal? Regular cable TV isolators do not work with satellite signals. Any help would be appreciated. Thanks
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Re: Breaking ground loop hum caused by satellite dish... [message #1767 is a reply to message #1766] |
Mon, 23 May 2005 16:08 |
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Wayne Parham
Messages: 18793 Registered: January 2001
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Illuminati (33rd Degree) |
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The thing is, the dish itself is just an antenna with a coax feed. The installer probably connected the shield to earth ground at the most convenient point. The rest of your system is grounded through the AC wall socket and its earth ground is probably connected somewhere else, so there is a potential for a ground loop.The satellite dish tuner probably has S-Video and composite video outputs, but those will have a ground connection. But it probably also has an RF outputs that is modulated to a standard television broadcast frequency, like channel 3. That output can be isolated using RF transformers. If you can't isolate the system after the tuner, then you will have to solve the grounding problem another way. You might want to connect earth ground for the dish at the same point as earth ground connection of your AC outlets. If you're lucky, they come into the house fairly close to one another.
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Re: Breaking ground loop hum caused by satellite dish... [message #1771 is a reply to message #1767] |
Mon, 23 May 2005 19:20 |
Mr Vinyl
Messages: 407 Registered: May 2009
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Illuminati (1st Degree) |
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Hi Wayne, Everything you say is correct. However using an RF transformer on the RF output doesn't break the ground loop for some reason. I am going to try your idea on grounding it to the same earth ground as the AC outlets. It's about thirty feet away. Hopefully this will work. Thanks again for your help and advice.
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