[SEDXC] FW: Band Pass Filters

[Jack Nelson]

Thanks for the information Chuck. I will check that book out. Sounds 
interesting. I do have a VNA.

73's Jack  K5FSE
Treas  QRP ARCI

jack.nelson at mindspring.com


----- Original Message ----- 
From: "AE4CW" <ae4cw at att.net>
To: <sedxc at contesting.com>
Sent: Monday, October 24, 2011 6:12 PM
Subject: [SEDXC] FW: Band Pass Filters


> For Field Day this year we put together stub-based band rejection filters
> that worked quite well.  We were looking for all the rejection we could 
> get
> for the least expense/work.  Based on the nice work in W2VJN's book on
> Managing Interstation Interference we put together cascaded stubs that
> rejected 40 and 15M while passing 20 and 10M.  Another set passed 40 and 
> 15M
> while rejecting 20 and 10M.  Both sets provided better than 40 dB of
> rejection.  This is probably more than you need for QRP and a single stub
> might work just fine as Tom indicates.  The cascaded versions are a bit
> fussy to construct , and a VNA is almost a necessity to get them right, 
> but
> I think the single stubs could be done with a simple antenna analyzer.  In
> any case, W2VJN's book is a good read.
>
> ---
> Chuck, AE4CW
>
>
> -----Original Message-----
> From: sedxc-bounces at contesting.com [mailto:sedxc-bounces at contesting.com] 
> On
> Behalf Of Tom W8JI
> Sent: Monday, October 24, 2011 5:38 PM
> To: Jack Nelson; sedxc at contesting.com
> Subject: Re: [SEDXC] Band Pass Filters
>
>> Now and then, I like to leave the 7600/9500/stacked StepIRs, and take
>> the popup and do a little QRP to the Field. I generally have someone
>> with me and we throw up a couple W3EDPs into some trees and try to
>> operate on two bands.
>
> Radios have a lot to do with it. Filters really just make up for radio
> shortfalls, no matter what radios we have.  What radios do you use? How 
> far
> apart are the antennas?
>
> Depending on the radios, antenna spacing, and bands, even a little 1/4 
> wave
> shorted stub on each radio might work.
>
> 73 Tom
>
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