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[RFI] RFI affecting computer - help!

To: rfi@contesting.com
Subject: [RFI] RFI affecting computer - help!
From: hankkier@aol.com
Date: Wed, 10 Mar 2010 19:07:41 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
I use Writelog for contesting on Dell computer, with a Icom Pro3 radio and 
Microham interface for RTTY and CW. has been in place for about 5 years now 
without change.

last month entered first serious RTTY contest, WPX RTTY, then a week later ARRL 
CW. In each case I never went more than an hour, sometimes a lot less, without 
my computer crapping out from, I believe, RFI. froze up completely, generally 
halfway through an exchange being sent, without even releasing the xmit relay 
from the radio. only thing I could do was turn off the power to the PC and 
restart, and switch the radio over to SSB momentarily to kick the relay out. 
each time cost me 3-5 minutes to get back to where I was, often a lost qso,  I 
have occasionally experienced freezeups before, but never anything like this 
past 2 weekends.

I can't think of anything I have done to the station, except I switched from a 
regular mouse to a cordless variety. 
I have toroids on each cable going into the computer, incl keyboard and AC 
power line. the problem occurred when I was on both antennas (40-2CD and 
C31XR), posssibly even on 80, don't remember for sure. wife also complaining 
about constant interference with cable TV all weekend, and there are toroids on 
those cables too.
question: is there some way to determine what is causing the RFI? where it is 
coming from? so I can directly address it.
alternatively, what type (#) ferrite rods are recommended to try those on the 
various cables leading to the computer (and TV)?
or some other solution!
Hank  KF2O

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