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Old 11th Jan 2018, 6:41 pm   #5
G6Tanuki
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Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,951
Default Re: Quartz crystal accuracy over time

It depends on the 'cut' of the crystal. http://www.radio-electronics.com/inf...s-at-sc-ct.php Some cuts are more-stable than others.

As an example, I recently dragged out of retirement a Pye W15FMB Westminster two-way VHF radio that I'd used for 145MHz mobile in the 1980s. This uses xtals on 4.mumble MHz whose output is successively multiplied-up to 145MHz. To my amazement after 20 years in hibernation in the attic, all the channels were still within 1KHz.
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