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Eliminating ground loop video noise

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Jim Krause
Eliminating ground loop video noise
on Nov 16, 2005 at 6:12:25 pm

I've got what I think is a ground loop issue in my video studio. When I patch the output from our edit bay into our large (consumer) client monitor I can see a noticeable horizontal band of light that slowly cycles through the display. (FWIW It's a Sony Grand 60" WEGA) It's very noticeable when using composite, slightly less whe using Y/C and still noticeable when using the component connections.

FWIW- the edit bay itself and all of the VTRs and monitors are fine and noise free. The issue is only when I patch to our client monitor or send the output to our dub rack.

I've tried lifting the ground but this doesn't seem to help- so I'm considering an isolation transformer. In terms of isolating the video signal I've found a three-channel Allen-Avionics VIT-753 might work for a component connection. Another approach is to use something like Furman's isolated power supply. It provides a small bank of isolated AC plugs.

I'd appreciate hearing from anyone who has any experience or insight into this.

Thanks

- Jim



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nightdesigns
Re: Eliminating ground loop video noise
on Nov 16, 2005 at 8:06:42 pm

You try a humbucker? Since it's only your monitor signal you won't need to worry about the very slight quality hit you'll take. You can pick them up on ebay for cheap.


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Jim Krause
Re: Eliminating ground loop video noise
on Nov 18, 2005 at 4:28:06 pm

Thanks for the suggestion. I've used the Humbuckers before (with fine results) but I believe they only do composite. Ideally I'd like a component or at least Y/C device. I'm borrowing a power supply transformer this afternoon. Maybe that will do the trick.

Best

- Jim


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