I should have said that this explanation is only valid with WSJT-X split mode 
is not in use.   When split mode is used the situation is either simpler or 
more complex depending on your perspective.


In WSJT-X split mode the audio frequency is constrained to the range 1500-2000 
Hz.   If the TX cursor is outside the range 1500-2000 on Widegraph then the TX 
VFO frequency is incremented or decremented in 500 Hz steps such that audio 
frequency remains in the range 1500-2000 Hz.


A picture is worth a thousand words and a picture can be found on  page 35 of 
this presentation:


http://www.w7tbc.org/downloads.php?do=file&id=387



73,

Andy k3wyc


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