[CQ-Contest] W3NQN Bandpass Filters (Was: Re: 419 band passfilters..
Zack Widup
w9sz at prairienet.org
Fri Mar 30 08:53:22 EST 2007
There is a program you can download called ELSIE (the student version is
free). I see they also have a new one called SVCFilter but I haven't
played with that one yet.
http://www.tonnesoftware.com
After a few hours of playing with filter designs and looking at the
reeponses of the various types you'll see that the filters top-coupled
with resonant circuits are much better than the designs that are coupled
with capacitors.
73, Zack W9SZ
On Fri, 30 Mar 2007, Marijan Miletic', S56A wrote:
> W0UN wrote:
>
> I am sorry to disagree with you in the extreme. I did much of the original
> testing (along with K3LR) on the W3NQN filters as well as additional testing
> on ICE and Dunestar filters, and the W3NQN filters are DRAMATICALLY better.
>
> Which is what one would expect since the W3NQN filters are top-coupled with
> an additional resonant circuit rather than just using a capacitor as
> is done in the
> ICE and Dunestar filters.
>
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