I will probably sound dumb but did you consider cheap RTC chips? I have one based on DS3231 currently on my table and although its is specified to have precision +/-2PPM my seems to be in range about 0.5PPM right from package with possibility to do some corrections.
Petr Titera Dne 11. 1. 2019 v 20:57 Joe Hobart napsal(a): > I need a relatively lightweight, self powered, portable clock accurate to 1 > second per month. Temperatures may range from 10 to 35 C; altitude from 1000 > to > 7000 feet. Although expensive, some of the marine quartz chronometers appear > to > meet this requirement. ~0.3 PPM. > > Does anyone have any experience with these devices? > > If so, has anyone tried to detect the probably weak magnetic field generated > by > the clock mechanism for time comparison purposes? > > Thanks, > Joe, W7LUX > > --- > This email has been checked for viruses by AVG. > https://www.avg.com > > > _______________________________________________ > 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.
