This will be my Z3801A's second rollover and its third 1024-week epoch. Is there any pre-1980 GPS equipment still out there that will be undergoing a third rollover and fourth 1024-week epoch?
Was the 1978-1979 Block 1 GPS usage, using a different base date, or were there more fundamental changes in 1980? The Block 1 birds were still in use in the 1990's. Tim N3QE On Wed, Feb 6, 2019 at 8:18 AM Bob kb8tq <[email protected]> wrote: > Hi > > One would *hope* that everybody making multi GNSS modules would be cross > checking > and taking care of GPS rollover that way. It’s always nice to see them > explicitly stating > that they are doing it. > > Bob > > > On Feb 6, 2019, at 12:57 AM, Michael Wouters <[email protected]> > wrote: > > > > BeiDou, Galileo and GLONASS all broadcast UTC time of day (or thereabouts > > for GLONASS - it's offset by the timezone for Moscow) so any multi-GNSS > > receiver has a sanity check on UTC calculated from GPS. > > > > Michael > > > > On Wed, 6 Feb 2019 at 11:03 am, Bob kb8tq <[email protected]> wrote: > > > >> Hi > >> > >> From what I can see, you can send it a command that puts a new “oldest > >> date” > >> number into flash. Since it also tracks Glonass and Galileo, that will > >> stretch out the > >> time before you *need* to do something (like into the next century). > They > >> also have > >> the “no dates before the firmware was issued” check. There may be other > >> date > >> checks in there. Those are just what I’ve found so far. > >> > >> It also is likely that the “new” GPS sats will be flying within 19 > years. > >> That will add > >> more bits to the GPS time fields. Who knows if the “modern” modules > >> already handle > >> those bits or not …. > >> > >> Bob > >> > >>> On Feb 5, 2019, at 5:23 PM, Hal Murray <[email protected]> > wrote: > >>> > >>> > >>> [email protected] said: > >>>> The F9P has multiple cross checks, traps, and even a user configurable > >>>> “oldest possible date” entry. > >>> > >>> Neat/thanks. > >>> > >>> Is that stored in flash, or lost on power cycle? > >>> > >>> If it's in flash, I can "fix" things for another 20 years by extracting > >> the > >>> device from its box, taking it to a bench setup, running a flash-update > >>> program, then reassembling things. As ugly as that is, it may be > >> simpler than > >>> updating the firmware in the box. > >>> > >>> > >>> -- > >>> These are my opinions. I hate spam. > >>> > >>> > >>> > >>> > >>> _______________________________________________ > >>> time-nuts mailing list -- [email protected] > >>> To unsubscribe, go to > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >>> and follow the instructions there. > >> > >> > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
