[CQ-Contest] W3NQN Bandpass Filters (Was: Re: 419 band passfilters..

[Zack Widup]

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.
>