On Tue, 24 Feb 2004 17:45:51 GMT, "Harold E. Johnson"
wrote:

Sorry for the lack of definition, I was referring to crystals not
specifically treated to enhance overtone operation. When a manufacturer
makes a crystal for overtone use, he/she treats it to suppress spurious
responses close by the desired overtone so the crystal "likes" to operate
properly. An untreated crystal often will have those responses and oscillate
on one or more of them instead of the desired frequency unless the feedback
and tuned circuit are carefully managed to ignore them.

The following link is worth checking out as an overview....

http://www.icmfg.com/crystaloscillatordata.html
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