[Amps] W3NQN band pass filters

[d.cutter at ntlworld.com]

Presumably this is for a contest station.  What matters more is the break thro into the other station's rx and this can be strongly influenced by the antenna or input Z of the linear on the filter.  It's particularly a problem on a wide band like 80m

Breakthro into an adjacent filter is important, so  a rigorous approach to screening and relay switching is needed.  I think it was the Bavarian Contest Group that showed a multi-filter bank you will find interesting

David
G3UNA

> 
> From: "jeremy-ca" <km1h at jeremy.mv.com>
> Date: 2008/06/11 Wed PM 04:52:33 BST
> To: "Alton McConnell  Avon-Cadillac" <amcconnell at avonauto.com>, 
> 	<amps at contesting.com>
> Subject: Re: [Amps] W3NQN  band pass filters
> 
> A 1.2:1 VSWR isnt sufficient?
> 
> Carl
> KM1H
> 
> 
> ----- Original Message ----- 
> From: "Alton McConnell Avon-Cadillac" <amcconnell at avonauto.com>
> To: <amps at contesting.com>
> Sent: Monday, June 09, 2008 8:03 AM
> Subject: [Amps] W3NQN band pass filters
> 
> 
> >I am trying to align some W3NQN band pass filters that I have built for
> > club use. I am using the design from the May and June 1998 QST article.
> >
> > I am using a HP 8656 Signal generator and a 30 MHz scope for the tuning.
> > Measuring the return loss with a MFJ 269 SWR analyzer, the best that I
> > can do is 20db.
> >
> > Any suggestions for alignment of the filters?
> >
> > Alton, NU8L
> > Amcconnell3 at hotmail.com
> >
> >
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