On Thu, 8 Mar 2007 23:40:40 -0800, Marlon K. Schafer wrote:
>Out of my 25ish tower sites I have a couple that are a LOT of trouble.
>Can't find any other cause so I'm hoping that it's just a simple harmonic or
>induction on the cat5 cables.
That's pretty vague. What sort of trouble? What sort of system? What is the
ethernet doing?
Ferrite chokes can effectively kill common-mode antenna behavior of ethernet
lines at HF if you use the right materials and wind them appropriately. BUT:
I've never seen an RFI problem with ethernet systems RECEIVING interference,
only generating it, and I've run 1 kW in VERY close proximity to my ethernet
wiring. Perhaps there's enough error correction to prevent data errors when
RFI occurs.
http://audiosystemsgroup.com/RFI-Ham.pdf
The tutorial at the link above may give you some troubleshooting ideas.
73,
Jim Brown K9YC
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