John, Bill,

perhaps another approach would be to think of the data flow and how integrity of the contact log is maintained. Currently WSJT-X has data integrity since a log entry is made at the point at which a QSO seems to be finished. If the finish sequence re-appears, then another record is made. The logic for this is simple, and there is no danger of a QSO not being recorded in the log if, for example, something crashes.

That being the case, then the log from WSJT-X may, necessarily, contain duplicates. Removing those duplicates then becomes a process that may be achieved either by some stand-alone program or in a logging program.

It seemed so much easier with paper logbooks, but probably not for TO9W!

73,

Robin, G8DQX