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After putting this crystal in my test oscillator and seeing 9.xxxMHz, I can assume the crystal is intended to operate at the third overtone. A bit of reading online suggests that the extra response at 27.165 and so forth are spurious by-products of other vibrational states, so I shouldn't need to be too concerned about that, I hope. Yes both were almost identical.

[QUOTE="brandon7861, post: 782010, member: 53724"] After putting this crystal in my test oscillator and seeing 9.xxxMHz, I can assume the crystal is intended to operate at the third overtone. A bit of reading online suggests that the extra response at 27.165 and so forth are spurious by-products of other vibrational states, so I shouldn't need to be too concerned about that, I hope. Yes both were almost identical. [/QUOTE]

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