For curiosity sake, this sounds like it is a Master Clock > Slave Clock system.
Are the slave clocks DC Impulse driven or do they have AC synchronous gearbox motors which then correct on/near the hour every 12 hours? For instance at 6 O'clock twice a day on let's say the 58th minute? You want something more accurate than a TCXO module which might plug into a slot on the backplane of the master clock? Donald Resor N6KAW -----Original Message----- From: time-nuts <time-nuts-boun...@lists.febo.com> On Behalf Of paul swed Sent: Friday, July 19, 2019 6:34 AM To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com> Subject: Re: [time-nuts] Clock accuracy 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 <j99har...@gmail.com> 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 <hmur...@megapathdsl.net> > 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 -- 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. > > > > > -- > > --Jim Harman > _______________________________________________ > 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.