Jim Boy did you actually hit the issues. I have run into all of them. The bearings are a real issue. I have one clock I need to pull down and lube. Pain in the butt. Regards Paul
On Fri, Jul 19, 2019 at 9:20 AM Jim Harman <[email protected]> wrote: > 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. > _______________________________________________ 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.
