[Elecraft] K2 audio problem

[Don Wilhelm]

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 
http://www.mmccs.com/mmarc/n0ss/k2_filters_using_gram_v5r17.pdf.

If you need a copy of Spectrogram, go to my website www.w3fpr.com 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.