To All: I have a related question; hope it's OK:
What are these companies using for their "GPS Simulation/Simulators?". Is it actually simulating the RF downlink or is a direct data stream injection into a tap into the receiver?? Thanks In Advance, John W. On Fri, Mar 29, 2019 at 11:00 AM Michael Shields via time-nuts < time-nuts@lists.febo.com> wrote: > Avidyne avionics are known to be affected by the rollover, causing the > loss of some displayed data. > > https://www.avidyne.com/files/downloads/606-00182-019.pdf > > > On Thu, Mar 28, 2019 at 3:04 PM Mark Sims <hol...@hotmail.com> wrote: > > > > I doubt that any GPS receivers will be newly affected on April 6. Some > very early receivers were hit on the first GPS rollover, but those made > since then usually have a 1024 week compensation built in based upon the > firmware creation date. Those rollover 1024 weeks from that date and start > sending incorrect dates at other places in the 1024 week cycle. Some > receivers even let you force the rollover week. > > > > > I have a Z3816A that’s showing a yellow “ro” next to the date in LH > and is 18 seconds ahead of a Motorola 12 channel > > > > If Lady Heather sees a date earlier than a set year (currently 2017), it > assumes the GPS device has rollover issues and adds 1024 weeks to correct > the date and shows the "ro" flag. > > > > As far as the 18 second time difference, one of the devices is > configured to show GPS time and the other is set for UTC time. At the top > right corner of the screen it should say either "UTC time OK" or "GPS time > OK" (as long as the device has a valid time). The TG and TU commands can > switch between GPS and UTC time displays. Some receivers have firmware > commands to switch between the two. For the others, Heather does the > conversion in software using the "UTC offset" (i.e. leapsecond count) > value. Many receivers send this offset. If it does not, the user can set > the value. And if no value is available Heather makes a best guess as to > what the value might be (and shows it in RED). The guessed value is rather > prone to errors, but is better than nothing. > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.