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 nudg
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 iss