[Elecraft] K3 noise reduction

[KM5Q]

Tony, I have AGC SLP set somewhere around 12 like you. That isn't the  
problem. Distortion is the inevitable effect of DSP noise reduction.  
The higher the S/N ratio, the less NR is needed, so I end up turning   
NR on and off manually according to S/N conditions (on SSB).

Someone else was asking for NR comparisons with other radios. I had a  
chance to compare K3 to a SGC-2020 ADSP2 (the late, advanced edition,  
highly regarded) -- NR is about equally effective, as is overall weak  
signal performance on SSB. However, the K3 has much more pleasant  
audio, with or without NR.

I also have a ClearSpeach DSP speaker (purchased in '99), which  
reduces any noise that is steady-state, like background hiss. It's  
good, but K3 NR is substantially more effective.

I still believe that there is room to improve the NR effect on steady  
background hiss.

Nobody has commented on my description of my NR seeming to get worse  
over a few weeks (while using the same firmware). I've begun to doubt  
my own sensibilities.

Windy KM5Q
K3 #764

> Hi Windy,
> I wonder if adjusting the AGC SLP would have an impact on NR  
> processing? I
> have AGC SLP at 12 and when I need NT it is set for F1-2. Maybe a  
> higher AGC
> SLP would cause  less distortion with stronger signals?
>
> 73,
> N2TK, Tony