[Elecraft] [K3] Slightly rough CW note on rx

[Don Wilhelm]

  Randy,

Since the problem seems to be confined to times that the internal 
speaker is being used, I must ask if you have the synthesizer stiffener 
added to your K3.

Why it would suddenly become a problem when it was not before is 
anyone's guess, maybe the screws mounting the synthesizer board work a 
bit loose.

If you do not have the synthesizer stiffener and you use the internal 
speaker, you should add it promptly.

73,
Don W3FPR

On 12/27/2010 4:59 PM, Randy Moore wrote:
> What's happened to my K3?  I've been noticing today that on rx, the CW
> note of signals is slightly rough.  It sounds just a little "fuzzy."  If
> I change modes to USB (no other changes), that roughness goes away
> entirely.  This is not the mechanical "fuzziness" that I've heard before
> that's audio frequency dependent.  It happens independent of the tone
> frequency of the signal, though it seems more apparent at the lower
> audio frequencies (I have my sidetone pitch set to 450).
>
> I have SPKR+PH setup on PF2, so I can turn it on and off quickly.
> Listening just to the K3 internal speaker, this roughness is always
> present.  If I listen through my CM-500 headset, and toggle SPKR+PH from
> YES to NO, the roughness remains on the signal for maybe a second, then
> goes away.  This must be a clue!
>
> This is K3 # 4564 (MCU 4.22, DSP 2.70) and I've been very happy with the
> CW tone until today.  I'm not aware that I've changed any settings
> lately.  I don't have NB or NR on.  Just AGC-F (though it is independent
> of AGC setting).  It is independent of bandwidth.  I have the 2.7kHz and
> 400Hz filters, and it happens with either and any setting of the DSB
> bandwidth.
>
> 73,
> Randy, KS4L
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