How to keep cat5e cables from picking up RFI?|
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Posted by on December 2, 2008, 1:24 pm
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computer. It's probably about a 50' run, maybe a bit more. I then got some new nice speakers for my computer. At some point since then I've found that the speakers are picking up some talk radio station. I've narrowed down the source of the interference to the network wiring. If I pull the cable the radio station goes away. Plug it in and it returns. I tried pulling the cablemodem cable from the router and the interference persists. I've tried various patch cables from the wall to computer with no change. The wire I used was UTP cat5e. Nothing special...it was bulk from the local home store. Would shielded cable fix the problem? I'd hate to rewire, but if it would fix the problem then I would. If so, does any shielded cat5e do the job? What about the jack? Does it have to change? And I guess the patch needs to be shielded as well? thanks! fg | |||||||||||||
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Posted by Robert Redelmeier on December 2, 2008, 1:53 pm
Please log in for more thread options This is odd. Even split pairs (which you don't have with color-coded jacks) wouldn't explain pulling in AM onto speakers. However, the unused conductors in the Cat5 can certainly act as an antenna which could pull AM onto the mobo, especially if the PSU/mobo grounding is poor. Check your grounding (wallplug and case). Also route your audio & speaker wires well away from the Cat5. The audio patch cable should be shielded or it will pick up all sorts of noise. -- Robert | |||||||||||||
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Posted by on December 2, 2008, 4:02 pm
Please log in for more thread options On Tue, 2 Dec 2008 10:24:57 -0800 (PST), benjunk@pookmail.com wrote:
>Last winter I did some in-wall cat5e wiring from my router to my
>computer. It's probably about a 50' run, maybe a bit more. I then >got some new nice speakers for my computer. At some point since then >I've found that the speakers are picking up some talk radio station. > >I've narrowed down the source of the interference to the network >wiring. If I pull the cable the radio station goes away. Plug it in >and it returns. I tried pulling the cablemodem cable from the router >and the interference persists. I've tried various patch cables from >the wall to computer with no change. > >The wire I used was UTP cat5e. Nothing special...it was bulk from the >local home store. Would shielded cable fix the problem? I'd hate to >rewire, but if it would fix the problem then I would. If so, does any >shielded cat5e do the job? What about the jack? Does it have to >change? And I guess the patch needs to be shielded as well? > >thanks! >fg This is common mode interference and it should be easy to get rid of. Have you tried ferrite beads on the Cat5 cable? Loop it several times through the bead and your RF should just be tiny amount of waste heat. Not enough to measure. | |||||||||||||
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> to my computer. It's probably about a 50' run, maybe a bit
> more. I then got some new nice speakers for my computer.
> At some point since then I've found that the speakers are
> picking up some talk radio station.