Thanks for the thoughts, gentlemen.

Yes, the DS3231 is a good idea, and was in the first version of the PCB,=20
but the GPS time service seems to be getting so popular that someone in=20
authority might have agreed to keep the time service going in wartime,=20
and I missed it, and so its popularity increased.

With the DS3231, updates could occur as infrequently  as once every 6=20
months and it would be enough. But in areas where the sun is strong,=20
temperature of the cabinet cannot be kept cool, and some time drift is=20
expected.

Still thinking.

--Bob A
--=20
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