• Broadcasting

  Eliminating ground loop video noise

  Posted by Jim Krause on November 16, 2005 at 6:12 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

  Jim Krause replied 20 years, 6 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Nightdesigns

  November 16, 2005 at 8:06 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.
• 

  Jim Krause

  November 18, 2005 at 4:28 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

Reply to this Discussion! Login or Sign Up