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@jeremy.mv.com>
> Date: 2008/06/11 Wed PM 04:52:33 BST
> To: "Alton McConnell Avon-Cadillac" <amcconnell@avonauto.com>,
> <amps@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@avonauto.com>
> To: <amps@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@hotmail.com
> >
> >
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