[Elecraft] K3s Notch Filter

[Arie Kleingeld PA3A]

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Is there any way to make the manual notch filter really narrow to keep morons running legal limit on FT8 from wiping out my waterfall and making my ears bleed?
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Well, the K3's nothfilter may not be the best for FT8. Besides that, 
when the notch is engaged, the AGC is still responding to that strong 
signal. That's in the design...

73.
Arie PA3A