Comments on: CCTV Ground Loop Problems

By: Tomi Engdahl

Tomi Engdahl — Fri, 09 Oct 2015 04:15:23 +0000

If redesign your system is feasible option, then it is a good way to fix CCTV systems. I can also recommend that approach.

There is also pöace for isolators in cases where that whole system redesign is not an option for some reason.

By: Dave

Dave — Thu, 08 Oct 2015 19:58:46 +0000

If you had to actually purchase a FM systems product to fight ground loops, you will realize that its MUCH cheaper to redesign your system and do it right to begin with.

By: katrina

katrina — Tue, 04 Nov 2014 09:10:29 +0000

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By: Tomi Engdahl

Tomi Engdahl — Fri, 21 Mar 2014 14:13:09 +0000

Hum Bars Hampered the TV Screens
http://www.designnews.com/author.asp?section_id=1368&doc_id=268671

Here at XTI Vancouver, we recently completed an audio-video system for a local restaurant/bar that underwent a major renovation. The video portion of the system has 4 LG 60-inch TVs behind the bar, with a Sharp 80-inch and two Sharp 70-inch screens mounted on a faux brick wall perpendicular to the bar.

All sets are fed from a Crestron 16×8 component video matrix switcher. This particular switcher has Cat5 balanced outputs as well as standard 75 ohm outputs, so we used the balanced outs and installed passive Baluns at each set to convert the balanced 110 ohm signal back to the unbalanced 75 ohm coaxial inputs on the sets.

We were rewarded with what appeared to be nasty hum bars all over the picture — bad enough that it was unwatchable

It had to be something to do with ground. Maybe a ground loop. Except these sets don’t have grounded power cords. It can’t have a ground loop. Or can it? I tried to think what had changed since we took down the original set. The mounting plate!

We took down the set and stuck an ohmmeter on the plate. It was grounded!

I plugged the RCA plug into an unused input on the set, and pushed the other end into the ground hole of the U ground outlet the TV was plugged into. Hallelujah! The hum bars vanished!

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By: idhrc.org

idhrc.org — Thu, 29 Dec 2011 13:58:30 +0000

London CCTV Security System Pictures To Help Police Investigation…

Police are hopeful that pictures from south London CCTV code will help them apprehend a robber who has been violently targeting country on trains in Kent and in south London. In recent weeks two adolescent boys and two men have been the aim of violent …