[Elecraft] K3S audio quality issue [SOLVED]

[Michael Kholodov]

If you have the tuning step 10Hz, tune to, say, 7.200.56 and then switch to coarse tuning, the display will show 7.200.5. But this 60Hz offset will still be present. Then no matter how you tune at the coarse setting, you will mistune. To fix that you should always reset the fine tuning offsets to zero before switching to coarse. 
It is apparently a bug in the software because the normal expectation would be to reset all fine offsets to zero automatically after switching to coarse tuning. 

Mike, AB3VN