Re: cw filters
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kh6sky
The MAX7410 can also be used as a notch filter. I usually need one of these about as often as I do a peak filter. I am going to order a couple and experiment. They are about $6 each at Digikey.
https://www.maximintegrated.com/en/design/technical-documents/app-notes/4/431.html Jim KH6SKY
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