[TenTec] [Fwd: Line Isolator Balun (sorta) question.]

[Jim Brown K9YC]

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