[Elecraft] K3 DSP Issue

[Don Wilhelm]

Larry,

If the problem appears in the HRD AF gain slider as well as from the 
front panel pot (actually encoder), then there is not a problem with the 
encoder itself.  You apparently had some sort of glitch in the DSP code 
that controls the audio gain.

"Pinched audio" could be the result of improper data in the Reference 
Oscillator calibration or incorrect filter selection.  I suggest that 
you do the reference oscillator calibration before drawing any other 
conclusions.  You might also want to check the per mode filter 
assignments using K3 Utility.

73,
Don W3FPR

On 2/23/2015 1:02 PM, Larry Boekeloo wrote:
> Hi everyone...
>
> Last fall, I thought I had an AF Gain pot failure in my K3.  The volume was very erratic.  When I would close the AF Gain down, the K3 would go to full volume and then go back to its normal state.  I checked this condition using the AF gain manually and by using Ham Radio Deluxe software.  The audio would act up whether I was increasing or decreasing the AF Gain.
>
>
> I was ready to replace the AF Gain control but decided to reload the software, MCU 4.86 and DSP 2.83.  That fixed my issue with the erratic volume control.
>
>
> Several weeks ago, I upgraded MCU to 5.01 to take advantage of the new QSK features.  Still no problems.
>
> Last Friday, I powered the K3 up and it was set for LSB on 1.895, where I had left it.  The Filter selected was the 2.7 and it's the only filter available from XFIL in LSB mode.  However, the audio was pinched as though the 400 Hz CW filter was engaged.  I pressed XFIL and all was normal.  However, my AF Gain problem returned.  So I reloaded the software and no fix.  I am 99.9% sure it's not the AF gain pot.
>
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>