If you want simple lumped ones, my website contains a basic filter design prog
http://www.scrbg.org/g4jnt/designsw.htm

For more advanced stuff, I use Ansoft Designer SV (student version)
which has a wonderful filter design tool under "projects - insert
filter design" then follow th einstructions

Designer SV is a big download, but its free and an excelent Rf design tool !

Andy  G4JNT

On 29/10/2007, Laurence KL1X <[email protected]> wrote:
>
> Anyone point me to an online tool for designing LPF's for say 5 7 or 9 pole 
> Chebyshev's on LF or HF? ps. Mr mail service hasnt plonked this months Radcom 
> onto my desk and not expecting it for another week or so; this is typical for 
> a routing that includes UK, Houston thence Singapore. with thanks Laurence 
> 9V1 LF
>
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