Many thanks for the link to W1HIS' excellent document.
John, N9JG
----- Original Message -----
Date: Thu, 26 Oct 2006 09:07:47 -0700
From: "Ron Castro" <ronc@sonic.net>
Subject: Re: [TenTec] RF gets into computer
To: <geraldj@storm.weather.net>, "Discussion of Ten-Tec Equipment"
<tentec@contesting.com>
Message-ID: <00ad01c6f918$e10c5150$6400a8c0@Ronlap>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I have also found that some keyboards are more susceptible to RF than
others. I don't know why, but there are definitely differences.
http://www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2006Apr06.pdf
Above is a link to a great article about common mode filter chokes, and
although most of it is aimed at balun chokes used for received noise
reduction, there is a lot of general knowledge about ferrite chokes in
general, including how to buy FT-240-43's for $5 in lots of 50. A common
mode filter right where the keyboard gets connected to the computer, as well
as one on the power cable, may be what's needed here.
Ron N6AHA
[snip]
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