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

Randy Moore wrmoore47 at gmail.com
Mon Dec 27 16:59:20 EST 2010


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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