Even the best of filters will sometimes be insufficient in a contest
enviroment.
I augmented my filters with coax stubs in the feedline to pick up another
20-25 dB. Some were cut for CW and SSB segments and changed as needed.
Carl
KM1H
----- Original Message -----
From: <d.cutter@ntlworld.com>
To: "jeremy-ca" <km1h@jeremy.mv.com>; "Alton McConnell Avon-Cadillac"
<amcconnell@avonauto.com>; <amps@contesting.com>
Sent: Friday, June 13, 2008 8:03 AM
Subject: Re: Re: [Amps] W3NQN band pass filters
> 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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