xtal issues?

n7gtb@...
 

I've just begun to characterize an batch (40 pieces) of the 3.2768Mhz xtals to use in the measurement receiver, and am seeing unexpected frequency plots.  I've uploaded two examples of the curves, to the files area under N7GTB stuff/xtals for measurement Rx...

Has anyone here seen this sort of response, and if so, know how to correct (or is this simply a bad batch of crystals?)...

Thanks & 73,
N7GTB - Vern
Kennewick, WA.


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