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Why Ferrite Cores with HDMI Cables?

post #1 of 2

1/13/07 at 8:45pm

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64 Posts. Joined 6/2000
Location: Olympia,WA usa
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I need a 25 ft HDMI cable to go from my DISH 622 and HDTV. Monoprice has them with or without FERRITE CORES. What's the difference?

post #2 of 2

1/14/07 at 6:43am

5,263 Posts. Joined 1/2000
Location: Salt Lake City, UT, USA
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They keep the square-wave data signals from leaking RF spectrum energy all over the place. Square waves have almost infinite noise bandwidth, and will cause interference to all your nearby radios and TVs.

A lack of ferrites might indicate that they have sufficient shielding to prevent interference, or that they are "clean" enough to meet some FCC Part-15 specs (but, could still interfere to some extent), but I wouldn't trust it. Ferrites are pretty cheap to make, anyway....good insurance.

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