Torid cores with multiple turn are more effective. K9YC has written a very
good paper about this. It can be found on his website. The file is
publications/rfi-ham.
Chuck Gooden - K9LC
-------- Original message --------
From: N1BUG <paul@n1bug.com>
Date: 08/20/2017 3:27 PM (GMT-06:00)
To: "rfi@contesting.com List" <RFI@contesting.com>
Subject: [RFI] Snap-on RFI suppression core size vs cable size
I suspect this is a stupid question but I am not finding a concise
answer or I am not recognizing it when I see it.
How important is it to fit the I.D. of snap-on RFI suppression
ferrites to the size of the wire or cable they are used on? At what
point does the core I.D. being larger than the wire begin to reduce
its effectiveness? Surely this must happen at some point? Larger
cores tend to have higher equivalent series resistance than smaller
ones, but I wonder how much of that may be given up if the wire
diameter is much smaller than the core I.D.
I ask because I need to purchase a significant number of these in an
effort to minimize RFI at 144 MHz. Obviously there is a significant
price break when buying large quantity of a given part, but I have
cables of differing diameters to deal with.
73,
Paul
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