Hi Bernie,
I think the trick is to press and hold the "NTCH" button to enter the manual notch mode. If you only tap the button, even though the display reads "Manual" and the icon appears, it is not really in the manual notch mode.
For example, my CW sidetone pitch is set to 560 Hz. If I tune a carrier to 560, and fully engage the notch mode, I can completely null a carrier when I tune VFO B to 560 Hz.
The other clue: If you only tap "NTCH", adjusting VFO B only displays frequency, whereas pushing and holding will cause VFO B knob to display the notch filter frequency.
Hope this helps.
73,
Jim - WS6X
-----Original Message-----
From:
[hidden email] On Behalf Of Bernie and Cheryl
Sent: Wednesday, December 16, 2020 1:16 AM
To:
[hidden email]
Subject: [Elecraft] K3s Notch Filter
Dear Folks:
I have a question about use of the Notch filter on my K3s. I am primarily a CW operator. I understand that, in CW mode, the notch filter's operation is manual, and you tune (adjust?) the filter using the VFO B knob (admittedly, I've not tried it in USB or LSB mode, where I understand its operation is automatic, unless you opt out).
I have tried using the filter in CW mode and can detect no effect whatsoever while turning the VFO B knob. I even tried it on the AM broadcast band, with the rig in CW mode, and was unable to have any effect on the AM carrier. For what it is worth, the little indicator on the LCD display, with the two arrows, does come on when I press the Notch filter button.
What am I doing wrong? Thanks for any help you can give me.
73 de Bernie, KF0QS
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