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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Accurate quartz watches
From: Brooke Clarke
Date: 2005 Mar 18, 23:24 -0800
From: Brooke Clarke
Date: 2005 Mar 18, 23:24 -0800
Hi Jared: That's very much the case if you wear the watch on a 24/7 basis, but if you don't then temp comp becomes important. As Peter has pointed out what's really important is that the aging is behaved. For a microcontroller based time piece project I tried about half a dozen unit oscillators (crystal oscillators packaged in a can with pin locations like a 14 pin DIP IC) and all but the last one had frequency drifting the wrong direction indicating that the cans were not hermetically sealed. These were new units purcahsed from major distributors, yet they were junk. Have Fun, Brooke Clarke, N6GCE -- w/Java http://www.PRC68.com w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml http://www.precisionclock.com Jared Sherman wrote: >Brooke- >> I thought this was the one area where wristwatches had an advantage, since >they essentially are kept at "skin" temperature which is fairly constant. >No? > > > >
