[SEDXC] FW: FW: Band Pass Filters

[AE4CW]

---
Chuck, AE4CW 


-----Original Message-----
From: Jack Nelson [mailto:jack.nelson at mindspring.com] 
Sent: Monday, October 24, 2011 7:07 PM
To: AE4CW; sedxc at contesting.com
Subject: Re: [SEDXC] FW: Band Pass Filters

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

I think Inrad is the only supplier of W2VJN's book. Check here:
http://www.inrad.net/product.php?productid=248&cat=148&page=1
---
Chuck, AE4CW


----- 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
>
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