[Elecraft] K3 frequency offset problem

[Chuck Guenther]

On a couple of occasions, I've noticed that my K3 display has been 
offset by approximately 0.90 Khz when operating CW.  Both times, I found 
that when I tuned my K3 to a signal peak in the P3 display,
there was no sound in the headphones.  When I tuned 900 Hz past the peak 
I found the signal.  This was a little embarrassing last night, because 
I issued a spot via DX Summit that was 900 Hz off from
later spots on the same station put out by others.

I found that the error could be corrected by turning the sub receiver 
on, putting the K3 in split mode, then going out of split and turning 
off the sub receiver.  This problem may be associated with my
habit of putting one VFO in CW mode, and the other in Data mode at one 
of the FT8 frequencies.  The problem seems to come up when I turn off 
the WSJT-x program.

My K3 has the latest firmware installed (5.66); I am using DXLab's 
Commander v. 13.8.1, and WSJT-x v. 2.0.0 .

I'd appreciate any hints about what I may be doing wrong.

Thanks & 73,

Chuck Guenther
K3 s/n 1061 (upgraded to at least an S-)