Thanks to all who made suggestions for the CW filter.
I know Harry Grimbergen, PA0LQ, very well. We were colleagues during our
working lifes. The filter I use actually is one like Harry's one but
with four passive tuned circuits instead of the opamps Harry is using. I
am very satisfied with the filter but it does not provide a "brick wall"
response. Filters as used in software defined radios do that and I was
looking for such a filter that could be used between the output of my
receiver and the headphones.
I will try the suggestions made by you; hopefully there is a "brick wall"
one among them.
73, Dick, PA0SE
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