[time-nuts] Portable Time Standard

[Petr Titěra]

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
> 
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