Why actually set the computer clock? Just compute an offset for the local clock based on the mean (or median) of the DT of the decoded messages. Then use this offset within WSJT-X to adjust the time used in the software from the actual computer clock.
Jim Record On Mon, Jun 24, 2019 at 2:11 AM DG2YCB, Uwe <dg2...@gmx.de> wrote: > A very good idea to set up time beacons, Reino! I like this approach! > > > > However, as a short-term solution IMO dev team should find a way to use > the EXISTING data set of DT values for a pop-up saying that very likely > time is not synced correctly, plus an option to correct time by one click. > Look the following example. Only one station has a DT value which is > totally out of the average. Would be easy to detect such things by any well > programmed algorithm. Even the old JT65-HF software had two additional > buttons, where one could simply set PC clock + or – some 100 ms (until +- > 2.5 s). Was very helpful for fieldday activities. Just click on + or – as > long as most of the other stations have DT around 0. Simple approach, but > worked 100%. > > > > > > 73 de Uwe, DG2YCB > > > > -----Ursprüngliche Nachricht----- > Hi, > > > > We are amateurs and could provide another time distribution experiment > especially during Field Day events. I mean setting up time beacon or > beacons that send e.g. every 15 s a short pulse, say 100 ms, on the base > carrier frequency e.g. 14.080 MHz. Timing of that pulse could be 'minute > mark - 1 s' or something similar agreed time. It would allow manual PC time > setting in the same manner as time marks of standard frequency stations. > That transmission would not disturb any FT8 message as nobody should > transmit at that time. It could be more useful, if the beacon frequency is > set to 1 kHz up (14.081), then you could hear it without detuning VFO and > disturbing you normal operation. Well, you could get same information from > dT values providing there are enough time accuracy in other stations and > you timing is good enough for decoding. > > > > Of course those beacons should be carefully synchronized to an accurate > time reference e.g. GPS. Depending on local regulations also a station > identity shall be sent at regular intervals using some applicable > modulation perhaps just before the time tick. I think that voluntary > stations would provide this service as needed. > > > > You could automate the time setting with a suitable program, if that could > be made safely and reliably (perhaps the pulses needs to be modulated for > identification), but that's next step if ever considered useful. > > > > 73 Reino oh3ma > > > > > > > > _______________________________________________ > > wsjt-devel mailing list > > wsjt-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/wsjt-devel > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel >
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