On Sun, 08 Aug 2010 15:19:19 -0400, Richards wrote:
>Hi Jim.... I am working my way through your piece, and getting the
>drift that clamp-on ferrite beads do not typically hurt me, but unless
>I have A LOT of them, they won't help much (if at all).
That's exactly right. The only thing they hurt is your pocketbook. And,
as compared to turns wound around a ferrtie core, they also hurt by
adding more weight.
>And yet, if I read your Figure 35 on page 26 correctly (unlikely, but
>I will try, anyway...) it seems to say one needs A LOT of ferrite beads
>to make a substantial difference
That's exactly right.
>I am especially interested in whether or not they might have more or
>better impact on a receiving antenna than on one I transmit with.
The primary benefits on a TX antenna are reduced RF in the shack, and in
your (and your neighbor's) living room. A string of beads IS enough to
prevent pattern distortion.
73, Jim Brown K9YC
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