You know, you can set a computer clock with WWV +/- propagation delay and muscle reaction time. It works and is very much like what one might do in the field on a bad day. Don't over think it.
73 -Jim NU0C On Sun, 23 Jun 2019 18:15:00 -0400 Topher Petty <ai8...@gmail.com> wrote: > Example from a quick search: > https://www.aliexpress.com/item/Aviation-Vehicle-Positioning-Receiver-G-MOUSE-Glonass-Navigation-USB-GPS-Module-Dongle-Tracking-Replacement-Alarm-Car/33006770294.html > > 73 de AI8W, Chris > > On Sun, Jun 23, 2019 at 6:11 PM Topher Petty <ai8...@gmail.com> wrote: > > > GPSD (Linux and OSX should be able to run this) can sync time to the > > computer from a GPS receiver... I've used that in the past on where > > internet access is problematic and time sync was critical. A cheap USB GPS > > unit could then be purchased (I've seen them as low as $5 on US sites, and > > around $2 on alibaba/aliexpress) for that purpose. Plug in the GPS, run > > GPSD, sync, go. > > > > It'd be very difficult for a computer to be off on its dT if it was > > continually syncing time to the GPS satellites... > > > > There's an old saying in IT.. something about programming idiot-proof > > software causing bigger idiots to be created... I forget the exact wording. > > > > 73 de AI8W, Chris > > > > On Sun, Jun 23, 2019 at 5:57 PM Mike Lewis <k7...@hotmail.com> wrote: > > > >> You could use the DT of the received stations to adjust the clock. > >> > >> > >> > >> Select a group with the largest agreement within a narrow range of a few > >> tenths of a second, and the program, or a program, can offer to adjust the > >> time into that range. Sort of like a wire protocol that derives its own > >> clock sync from the data stream. The change mechanism could be a > >> calculation or a manual slider. > >> > >> > >> > >> *From:* Jim Jennings <w...@comcast.net> > >> *Sent:* Sunday, June 23, 2019 14:15 > >> *To:* Black Michael <mdblac...@yahoo.com>; WSJT software development < > >> wsjt-devel@lists.sourceforge.net> > >> *Subject:* Re: [wsjt-devel] Field Day time problem > >> > >> > >> > >> When one of our stations at Field Day was set up for FT8, it became > >> apparent that a system time sync was needed before it could be used. One > >> of our participants was able to provide a NTP sync with his smart phone, > >> and W6AF (2A SV) managed a couple dozen contacts on 20 Meters with five > >> watts (Yaesu FT-817) into a low dipole. What about a location where > >> cellular or WiFi coverage is unavailable? > >> > >> > >> > >> VK4ADC’s free program GPS2Time can synchronize a computer’s system clock > >> using a GPS set with NMEA serial output (I have two hand held Garmins that > >> do this) through a COM port. The website is: > >> > >> https://www.vk4adc.com/web/software-projects/55-vk4adc-utils/181-gps2time. > >> If I had known about this prior to Field Day, I would have brought the > >> program and the essential items to try it. > >> > >> > >> > >> Jim, W7XZ > >> > >> > >> > >> PS FT8 was a big hit with the ops who tried it for the first time. > >> > >> *From:* Black Michael via wsjt-devel > >> > >> *Sent:* Sunday, June 23, 2019 05:27 > >> > >> *To:* WSJT Software Development > >> > >> *Cc:* Black Michael > >> > >> *Subject:* [wsjt-devel] Field Day time problem > >> > >> > >> > >> I've seen about 2 dozen clubs doing Field Day where their clocks are off. > >> > >> > >> > >> We need to provide an indication in WSJT-X when clocks are off like this. > >> > >> > >> > >> With concurrence I can do a patch for this....my idea is this. > >> > >> > >> > >> At least 5 decodes where 60% or more > 0.5 seconds is an indication of > >> bad timing. > >> > >> A message would be put in the Rx Frequency window "Your clock is > >> off...see help". With appropriate references in the Help to search "your > >> clock is off" and time solutions. > >> > >> > >> > >> This doesn't cover the case where their clock is way off as they won't > >> see any decodes. The only solution for that would be doing a time query > >> from a known source and I don't think we want to go that route. > >> > >> > >> > >> de Mike W9MDB > >> > >> > >> > >> > >> ------------------------------ > >> ------------------------------ > >> > >> _______________________________________________ > >> 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 > >> > > _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
