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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Timekeeping in the post-WWV/post-HF world
From: Peter Monta
Date: 2018 Sep 28, 21:12 -0700
From: Peter Monta
Date: 2018 Sep 28, 21:12 -0700
Hi Tony,
Does this mean if I buy a quartz watch on a flee market (which I always do) - it has already aged-in to a more horizontal/predictable curve?
As I understand it, aging is dependent on the thermal history of the crystal. If the wristwatch is kept in the same thermal environment for many months, it may get a little more predictable. But going from flea-market shelf to wrist is enough of a change that any aging trends may be "erased".
These slides from John Vig summarize crystal oscillator lore:
Start from page 60 of the PDF for discussion of aging.
Cheers,
Peter
