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Re: [RFI] Ferrite Beads

To: "rfi@contesting.com" <rfi@contesting.com>
Subject: Re: [RFI] Ferrite Beads
From: "Jim Brown" <jim@audiosystemsgroup.com>
Reply-to: Jim Brown <jim@audiosystemsgroup.com>
Date: Tue, 19 Oct 2004 00:32:03 -0500
List-post: <mailto:rfi@contesting.com>
On Mon, 18 Oct 2004 20:57:54 -0500, Ford Peterson wrote:

>Since there is no connector set available from Toyota, I'm stuck either 
>slashing the 
>harness and inserting a toroid with 4 conductors and cobble together some 
>kludge 
>job that would void t

There are other options. Look at the Fair Rite catalog (study it carefully -- 
it takes hours to 
digest this stuff, and more hours to select the right parts). There are some 
VERY large 
clamp-ons of #31 or 78 material (don't remember which) that you could 
potentially get 
several turns through. Study the dimensions of the clamp-ons, the dimensions of 
the wires, 
order a selection of them, and give it a shot.  You are looking for a ferrite 
part that is as 
long as possible (consistent with the available length of wire).  R and X are 
proportional to 
length and proportional to the SQUARE of the turns. So two turns through a 
shorter core is 
twice as good as one pass through a longer one.  AND the greater number of 
turns will 
move the effective range down in frequency. 

Jim Brown K9YC






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