[Elecraft] K2 - DSP - Impressive

[David Wilburn]

I do not argue that my settings my settings could likely use some 
tweaking.  My epiphany was concerning how the DSP cycled through the 
different settings.  The other thing that helped me was cranking the 
gain up.  With the gain set to higher settings, the higher beta is 
more tolerable.  I actually end up pulling back on the AF settings at 
times.  But based on your statement, I went over there and played a 
little bit, and ended up with beta / decay settings in the 50 range, 
and depending on conditions, I could see it going lower.  But I find 
if I cycle through the .nr1-4 settings, and the SF1-4, I often find a 
comfortable setting before I end up fiddling with the beta / decay.

David Wilburn
dave.wilburn at verizon.net
K4DGW
K2 #5982
FP#-1751


Steve Kallal wrote:
> David,
> 
> Wow, the default Beta and Decay settings leave me with a lot of distortion.
> I can tolerate more distortion on SSB than on CW. The denoiser makes CW
> sound scratchy, but till copyable. I left the Beta setting close to the
> default, but really reduced the Decay setting. I put it down to 30, though I
> did have it down to 5 at one point.
> 
> I guess I am used to DSP with less distortion. My 756PROII is able to reduce
> the noise level without the degree of distortion present in the KDSP2. The
> KDSP2 does get the job done. I starting to prefer the bandpass filtering
> over the denoiser, and only use the denoiser if really needed. For example,
> I use the narrowest filter setting of 50 Hz, for the CW bandpass filter.
> I've found it can work better than the denoiser in most situations.
> 
> 73,
> 
> Steve N6VL
> K2 #2289
> 
> -----Original Message-----
> From: David Wilburn [mailto:dave.wilburn at verizon.net] 
> Sent: Sunday, October 21, 2007 10:20 AM
> To: Steve Kallal
> Cc: 'Elecraft Discussion List'
> Subject: Re: [Elecraft] K2 - DSP - Impressive
> 
> I set everything back to the default settings.  Then the only ones I ended
> up change was the SSB & CW gain settings.  After that, when I want to use
> the DSP, I would step through the different "freq widths" 
> that are supplied by S1(NR1, NR2, NR3, NR4), then S2(NR1, NR2, NR3, NR4),
> and so on.  This is the piece that I did not "get" the first time around.
> 
> My initial tinkering had focused on the settings you mentioned.  But it
> seems to me, that tinkering with Beta and Decay, before you have worked
> through the existing setup, that is the application of the various filter
> widths to you problem noise, is going about the process from the wrong end.
> Perhaps Lyle can explain it better.
> 
> I hit DISPLAY to get into the DSP settings, usually C1 .nr (for CW) or 
>    S1 .nr .nt (for SSB) is seen at this point.  If not, press RCL untill one
> of them is visible.  Then pressing STORE brings up C1 .nr1, pressing STORE
> again, brings up C1 .nr2, and so on till you are back at C1 .nr1.  If I do
> not find a suitable setting in the first 4 filter settings, I then press
> AFIL to take me to CF2.  Now pressing DISPLAY followed by STORE brings up C2
> .nr, and I can go through these steps again.  This cycle can be continued
> through CF3 and CF4.
> 
> In performing these steps, I have not needed to fiddle with Beta and Decay.
> I assume and changes to Beta and Decay, impact all 16 filters per mode.
> 
> Hope this helps.  It sure made a big difference in how I use the radio.
> 
> David Wilburn
> dave.wilburn at verizon.net
> K4DGW
> K2 #5982
> FP#-1751
> 
>