Hello, all, I harbored some suspicion regarding the "DT" numbers as displayed by wsjtx in WSPR mode. Today I made some experiment, and indeed: DT showed an offset of -0.8 s, even though the two clocks were in perfect sync.
Details: I set up two laptops side by side. I saw to it their clocks are in sync. Both run wsjtx in WSPR mode. I had one of them whistle and the other receive, directly from speaker to mike, no radio link was involved. The receiving laptop consistently showed a DT of -0.8 s. In one experiment, I had them switch roles. The now-receiving laptop showed a DT of -0.9 s. Both laptops run Debian Jessie on AMD64. The wsjtx used is version 1.7.0-r6192-1~ki7mt~trusty, which I installed as described at http://wsprnet.org/drupal/node/5567 . To sync the clocks, I used ntpd on both laptops. Besides some other servers, each ntpd had the other laptop also configured as one server. So I could ask ntpd what the time difference to the other ntpd is: Below 10 ms. In passing: While doing the experiment, one of the wsjtx instances froze while decoding. The UI did no longer move, the clock stopped, I had to kill. Vy 73, Andreas, DJ3EI ------------------------------------------------------------------------------ _______________________________________________ wsjt-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/wsjt-devel
