[Elecraft] [EXTERNAL] Re: K2 audio problem

[Don Wilhelm]

Dan,

Toward the rear of the KDSP2 manual, there is a list of the original DSP 
menu settings.

Yes, the denoiser will cause a certain amount of distortion, especially 
at the more aggressive settings where it can be a LOT.

73,
Don W3FPR

On 7/27/2018 11:26 PM, Pawlak, Daniel L wrote:
> Don,
>     Thanks for the advice. I did the alignment with Spectrogram. A few of the filters were off, and I corrected them. However, it didn't make much difference in improving SSB intelligibility. I then realized that the KDSP2 might be introducing artifacts to the audio.  I turned the denoiser off, and the audio was much better, but the noise was unbearable. I was gong to play with the various settings, when I remembered there were many differing opinions on how to set them up properly, and I think the conclusion was that the factory settings should be used. Did I recall correctly? If that's the case, can you share them with me? I might have mucked them up a long time ago.
> 73,
> Dan  KF4KKF
> ________________________________________
> From: Don Wilhelm [donwilh at embarqmail.com]
> Sent: Sunday, July 22, 2018 2:04 PM
> To: Pawlak, Daniel L; elecraft at mailman.qth.net
> Subject: [EXTERNAL] Re: [Elecraft] K2 audio problem
> 
> Dan,
> 
> Align the IF filters.  I have no idea what may have made them change,
> unless you tried to do a Master Reset which would change the filter
> settings back to factory defaults, which only work well in a few K2s.
> 
> It is best if you use an audio spectrum analyzer running on your
> computer to see where the filter passband is located in the audio spectrum.
> 
> Information on how to set up Spectrogram can be found on Tom Hammond's
> (N0SS, now SK) website which has been preserved at
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mmccs.com_mmarc_n0ss_k2-5Ffilters-5Fusing-5Fgram-5Fv5r17.pdf&d=DwICaQ&c=YC-d702opsuYKpiO2Bmlzg&r=kP1njbluGgLcMdyEofM_F-lOGeRxHPEzfZ061VLXuAc&m=Sf-V4Vad14JSlM60ZznWp6L217ZRrXQqyxHStbeBmgY&s=3poR3hBdK3n1-SXX_YitFbw26l5srWNxRxpeNqfoCwE&e=.
> 
> If you need a copy of Spectrogram, go to my website https://urldefense.proofpoint.com/v2/url?u=http-3A__www.w3fpr.com&d=DwICaQ&c=YC-d702opsuYKpiO2Bmlzg&r=kP1njbluGgLcMdyEofM_F-lOGeRxHPEzfZ061VLXuAc&m=Sf-V4Vad14JSlM60ZznWp6L217ZRrXQqyxHStbeBmgY&s=lXG8j1NvNQy33wPnljdeJS8T7K4Aape696X1oRpqDfY&e= and
> scroll near the bottom of the opening page.  There you will find links
> to Spectrogram version 5.17 and version 16.  These files are local to my
> website.
> 
> If you did a Master Reset, also refer to the K2 dial Calibration article
> on my website.  You will have to do a CAL PLL in addition to the filter
> alignment (CAL FIL).
> 
> Advice to all - do not do a K2 Master Reset unless you first record ALL
> your menu settings, including the Filter settings.  The first few pages
> of the K2 A to B upgrade instructions has instructions for recording all
> you menu settings.  Restore them after a Master Reset.
> 
> 73,
> Don W3FPR
> 
> On 7/22/2018 1:36 PM, Pawlak, Daniel L wrote:
>> I'm having trouble figuring out what's wrong with my K2 (serial 3957). It's been a very long time since I turned it on and now the audio sounds horrible. It sounds like it's muffled or like I'm listening to the speaker at the end of a long tube. High frequencies seem to be diminished. I've started doing an alignment, but have not found anything wrong so far. Any ideas on how to fix this problem?
>> Thanks.
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to donwilh at embarqmail.com
>