On Wed, Oct 14, 2009 at 2:47 PM, Rick Karlquist <richard@karlquist.com>wrote:
> Bill Tippett wrote:
> > VE9AA:
> >
> >> Consider a Par Electronics BCB filter, IMHO much better than
> > the ICE 402:
> >
> > http://parelectronics.com/bcst-hpf.htm
> >
>
> This has the same problem as the ICE filter. An impressive
> looking measured curve, but no guaranteed specs. Having built
> many filters, I can tell you that repeatability is a huge
> issue in the case of a 160 BCB filter, now that you have to
> reject 1700 (I have a local station there :-(. You can always
> tweak one by hand tuning to look very good. How do I know
> the one I purchase is going to look so good?
>
Contact the owner Dale Parfitt W4OP. Dale can tweak the #3 null in the
response shown to exactly reject 1700 kHz. Poke around on his website...it
might give you a little more confidence he knows what he's doing. I believe
he's very QRL with military contracts at the moment but he's generally
responsive to emails.
73, Bill W4ZV
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