Hump in Cord

[sean74]

Does anyone know what the hump in a monitor cord near the connector is for? I've taken one apart, and it's just a cylinder that goes around the cord.

I'm guessing it's used to reduce EMI, but I don't know the specifics, and don't know what the hump is called.

Anyone know?

 

[GoSharks]

You are correct!

Some manufacturers put a ferrite core on the video cable to reduce radiated radio emissions from the cable shield. Radio emissions that possibly could interfere with your television or radio reception for example. Even BNC cables sometimes need ferrite cores because it is the outside shield of the cable that acts as the antenna. It depends on how noisy (from a radiated emissions point of view) the video card is. After all it is the video card that is producing the radiated emissions to begin with. This is also why some video card manufactures put filters on the output video signals that sometimes reduce 2D performance at higher resolutions.

Good Luck

Jim Witkowski
Chief Hardware Engineer
Cornerstone / Monitorsdirect.com

Jim at http://www.monitorsdirect.com