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Subject: Re: noisy power supply
From: Karl Cunningham karlc@.......
Date: Thu, 06 Jul 2000 07:56:32 -0700

another couple of cents:

The isolation transformers used in network cards are good at isolating
computers on different ground systems, but aren't very good at filtering
out high-frequency noise.  This noise can be conducted from one computer
through the network cable to the other computer, or radiated from the cable.

You might try looping the network cable through a ferrite toroid core
several times so that the start and finish ends of the winding are opposite
each other on the core.  Then experiment with different locations and
numbers of these ferrite cores on the network cables.  A similar scheme
significantly helped interference I had between one of my computers and
WWVB reception.

-- Karl

At 09:54 PM 7/5/2000 -0700, Charles wrote:
>Your LAN connection generally
>uses isolated transformer coupling and shouldn’t be able to
>significantly radiate.


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Larry Cochrane <cochrane@..............>