Re: Filter problem

Dave Platt <dplatt@coop.radagast.org> wrote:
>

Is there any chance you can make enough room in your setup for
something of the following sort?
 
https://www.pa0nhc.nl/IMDfilter/EN/Notch/Single/HelicalNotchfilters2mEN.htm

>
That's exactly the sort of thing I had in mind.  The author's dimensions
of 4" diameter and 6" high might be a bit of a problem but I could try
scaling it down and adding more turns to the helix.  Perhaps a piece of
35mm copper pipe would make a good starting point.
>
A length of thinner pipe would be easier to accommodate, so perhaps I
could experiment with something intermediate between between a coaxial
stub and a helical resonator.