[Elecraft] Subject: K3s Notch Filter

Thu Dec 17 03:05:22 EST 2020

Thanks Guys:

Of course, that was the right answer.  I thought, seeing the icon come on when I just hit the Notch button, that the Notch filter was active in the cw mode.  I didn't realize I had to press and hold the button.

Once I held the button, the display for VFO-B changed to the HZ display, and boy that filter works great!

Thanks again for all your help.

73 de Bernie, KF0QS

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: elecraft-boun... at mailman.qth.net On Behalf Of Bernie and Cheryl
Sent: Wednesday, December 16, 2020 1:16 AM
To: Elecraft at mailman.qth.net
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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