[TowerTalk] coax stubs /bandpass filter

[Jim Brown]

On Mon, 29 Mar 2010 08:58:24 +0200 (MEST), Stein Roar  LA6FJA-K3RAG wrote:

>Hi

>I have made a set of coaxstubs for bandpass filter, but it is not enough 
attunation..
>Is it normal with 20-30 db attunation ??

Yes. See http://audiosystemsgroup.com/Coax-Stubs.pdf  This is a first draft tutorial 
that I'm still working on. 

>We had big problems during WPX SSB as LN5O we experienced that the stubs didnt 
attunate enough between 20 40 & 15m...

You need to buy W2VJN's excellent book on this topic. You can order it for $20 from 
Inrad (the filter people). Also, there are several very useful articles by N0AX in 
QST. They are referenced in the tutorial (link above). 

73,

Jim K9YC