Somewhat tongue in cheek, from another relative beginner: There are also several seconday effects you will need to consider over the next 100 years:
-- Do you have a way of changing the battery in the clock without it stopping? -- Will the $10 clock's bearings last 100 years? -- If the 1 pps output from your GPSDO comes directly from the GPS, and not by dividing down the oscillator, how will you handle holdover events, when it may skip some pulses? -- Is the adjustment range of your oscillator sufficient to compensate for 100 years of drift? -- Will the other components in your GPSDO (esp. electrolytic capacitors) last 100 years? -- Will the GPS system still be operating 100 years from now, or will it go the way of LORAN? You might need a provision for seamlessly switching to a different 1-pps source if the technology changes. On Fri, Jul 19, 2019 at 5:10 AM Hal Murray <[email protected]> wrote: > > > If I live another 100 years [Let`s say I take antioxidants ;-) ] what > sort > > of error should I expect in this clock? [I know that it`s better than 1 > > second per day] > > You didn't say anything about skipping leap seconds. > > Ignoring that part, and assuming you have a good antenna, and assuming the > GPS > operators don't screwup and/or that your GPSDO has good enough holdover, > it > will be right on. > > Your system is tracking GPS. So the next question is what do you expect > your > clock to be tracking? If you want to track UTC, then you need to research > the > offset between GPS and UTC. (Hint: It's not very big.) > > > -- > 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. > -- --Jim Harman _______________________________________________ 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.
