Bob is of course exactly correct.Logger does not allow dupes.The time stamp may be minutes or even I found seconds different.I used DUPE SELECTOR vers 1.02.Google it it will analyze your logbook and show you the duplicate calls,but they are not actually qso's.i AM RUNNING 2 LOGS 1 ON THE OPERATIONS COMPUTER THAT RUNS WITH THE RADIO AND VARIOUS APPS,The other is logging.So the logs need to match.I was able to do that.The software gives you the choice of time difference.You want to start at say 1 minote.BUT,keep in mind you have the option of keeoing either entry.Make sure you delete the excess one...Again Logger 32 checks anything you import to it for dupes or errors.That's the bad.adi file...73