George, for better filtering you might try the Scaf-1 audio filter by Idiom
Press. It comes already assembled or in kit form. I have been using one off
and on for several months and like it. Nov. CQ has a review on it, page 34.
I do not know how narrow it goes but it has a pot to adjust band width and
will get rid of very strong adjacent signals.
I think that there are several reviews on contesting . com.
No connection with the company, just a satisfied customer.
73 Paul K9OT
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