Interesting. Back in the "old days" of JT65, if the DT's I saw were approximately zero mean, I figured that meant my clock was about right. During the FT8 RU, I never saw any negative DT decodes, and I worried that my clock was fast, in spite of checking it before the contest. Maybe some clock nudging would have picked up a few more QSO's.
73, Paul K6PO On Mon, Dec 3, 2018 at 7:37 PM Coy Day <n...@arrl.net> wrote: > My setup: Using FT8 V2CR5 on an Optiplex 9010 running Win7 Pro > > During the RU I observed WF signals where they were obviously calling me > but they didn't decode. I observed the same to day while running stations > on 7.074. Today I was not in RU mode. > > I saw a post that mentioned that DT may be an issue so I ran an experiment > to see what effect it would have. I used TimeFudge v1.0 to nudge the time > on my comuputer in .05 sec increments. I did this while watching the DT on > the signals that I was decoding. As the DT became negative the signals > stopped decoding. They would go from say 0.2 to 0.1 then 0.0 and then they > wouldn't decode. As I continued eventually all the stations stopped > decoding. When I nudged the computer time back up the stations started > coming back. > > This explained to me why I was not decoding some stations that were > calling me but it also could be the cause for some of those that said they > didn't copy any signals from the WF. It could be that their computer clock > was off just enough the cause all the signals DT to be negative. > > Coy, N5OK > > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel >
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