Anyone have some recommendations for a good company that makes RF and/or S-Video isolators? Found a bunch on amazon and google shopping but I'd prefer something a bit more direct.

What's a RF and/or S-Video isolator?

A ground loop isolation transformer?

[Link: jensen-transformers.com]

$$$

They are one of the easiest companies to get set up with...

Yeah, basically a ground loop isolation, passive.

Commercial system with a good amount of hum. I bonded and isolated the electrical which helped reduce it by 95%, now I just need that little extra off the video lines.

Could be any number of things, and not necessarily ground loop noise...

Worth a shot, but definitely not a cure-all.

Check your PM...

Thanks for the information. I explained to the client that this is a step by step troubleshoot. The building was built in the late 60's, never been updated. Lighting is old, power is old and they have RF modulators sending signal around the area. The new A/V system (not ours) includes an s-video camera system that when unplugged from the system, hum goes away. We reduced the hum 95%, just need that little 5% more and I think the isolators will do the trick.

Thanks

Sounds like an actual phasing issue to me...

Take all of your equipment and assign a phase to it. Track how many times the signal path goes from phase A to phase B and back. I would wager that it passes between the two phases several times. This noise is not something ground loop isolators will typically fix, but I'd love to be proven wrong!