I had the same issue with my K3s. Now that I have an FTdx101D, no more problems 
with noise.
73
Carl Yaffey  K8NU
614 268 6353, Columbus OH
http://www.carl-yaffey.com
http://www.bluesswing.com
http://www.timbrewolvesband.com
http://www.folkramblers.carl-yaffey.com
Http://www.clintonvillegrass.com

> On Dec 15, 2021, at 9:36 AM, Pete Smith N4ZR <pete.n...@gmail.com> wrote:
> 
> Last weekend during the 10 meter contest I was experiencing very loud 
> line-noise-like interference when my antenna was pointing south.  I tried 
> both my K3's Noise Reduction and Noise Blanker functions, and was unable to 
> find any setting that gave useful relief.  With the noise blanker, in 
> particular, I noticed that when it was on, not only was the buzz still very 
> strong, but it seemed as if all CW signals on the band were being 
> hum-modulated.  As soon as I turned off the noise blanker, the CW signals 
> cleaned up.  Is there something wrong with my radio, or an adjustment issue, 
> or is this interference simply too strong?  Obviously, I'll be trying to 
> track it down, but it's not there all the time, so that could be tough.
> 
> -- 
> 73, Pete N4ZR
> Check out the new Reverse Beacon Network
> web server at <http://beta.reversebeacon.net>.
> For spots, please use your favorite
> "retail" DX cluster.
> 
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