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

[Guy Olinger]

>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