[Elecraft] K3 6m pre-amp

[Jim Brown]

On Wed, 30 Jul 2008 20:33:53 -0400, Jack Smith wrote:

>Yes, I have several ferrite core 2.5 mH chokes here, including the 
>Hammond one you mention. There's a significant difference in high 
>frequency performance of the pi wound on ceramic form versus the smaller 
>pi-wound over ferrite and that's one of the things I'm hoping to 
>illustrate in the article. 

The RFI and Ferrite tutorial on my website includes clear explanations of 
the nature of ferrite materials from a circuit point of view. You may find 
it helpful in explaining why your very correct in your analysis. You are 
welcome to cite it as a reference. 

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

However -- ANY 2.5 mH choke has a good chance of looking capacitive at 50 
MHz. 

73,

Jim Brown K9YC