[RFI] TV RFI - an update 2

[Jim Brown]

On Thu, 14 Feb 2008 20:53:55 -0700, Tim Groat wrote:

>The technical data is available online:

There is MEASURED data on my website for 1-14 turn chokes wound with #18 wire 
on 2.4" toroids in #31, #43, #61, #77, and #78. There is also MEASURED data 
for coaxial chokes on #31 cores. 

http://audiosystemsgroup.com/RFI-Ham.pdf

>To get the same impedance on the 160M band, you need about ten times as 
>many turns with #2 powdered iron (mu = 10) as you would with #31 ferrite 
>(mu = 1000), or about eight times as many as with #43 ferrite (mu = 
>600)--all for the same size core.

WRONG!  For suppression, what matters is u'' (resistance), not u' 
(inductance). See the tutorial in the link above. 

73,

Jim K9YC