[PVRCNC] [PVRC] K4 Folks, New NB and NR in firmware R39 Beta

[Henry Pollock - K4TMC]

Guy,

Thanks for the thoughts. I am still experimenting with my new-to-me K4D.
Sounds like I need to update the R38 to R39 Beta. Do you have any thoughts
on the K4's SSB mode operation?

73,
Henry - K4TMC


On Mon, Sep 14, 2026 at 3:27 PM Guy Olinger via PVRC <pvrc at mailman.qth.net>
wrote:

> From their home page: "now with Advanced Spectral-subtraction noise
> reduction"
>
> For the first time since I got my K4, the noise blank and noise reduction
> in my K4 clearly and significantly exceed those of my K3. And now NR does
> something for CW. Wow.
>
> What the numbers do in NR are changed. What the numbers do in NB are
> changed. The two combine differently in different number combination if
> both are on. NB + NR + APF with BW .25 or .30 is very interesting in some
> situations.
>
> Messing around found one combo that really kills my AC buzz around here on
> 80/160. You can hear a low level artifact, but a CW signal causes that to
> go away when a baud is on.  Slow AGC seems to help. This update really
> changes things.
>
> There are artifacts, but they are way down to my ears.
>
> I am able to cleanly copy signals that aren't loud enough to put a trace
> on the waterfall.
>
> I was wondering when Elecraft would do something spectacular to fight
> noise. Until now they've been clearly behind their competition.
>
> Happy experimenting.
>
> 73, Guy K2AV
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