PRODUCTION ENGINEERING MEASURE: QUARTZ CRYSTAL UNITS CR-(XM-45)/U (HIGH SHOCK AND VIBRATION RESISTANT, LOW FREQUENCY)
Quarterly progress rept. no. 3, 1 Dec 1962-28 Feb 1963
BLILEY ELECTRIC CO ERIE PA
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Development of high shock and vibration resistant low frequency quartz crystal units was continued. The CR-XM-45U crystal units are similar to standard CR-42AU units except that the new units must withstand much more severe vibration and must also hold much tighter frequency stability over the 70 C to 80 C operating temperature range OTR. This report presents evaluation data from the second group of experimental units prepared for this project. They gave indications that the new experimental design - which uses special, double-rotated X cut resonators mounted in Blileys ceramic-frame holders - can be refined to meet the CR XM-45U requirements, provided an increase of 3.5 uuf is made in the specified capacitance values. Attention is now concentrated on im proving the temperature characteristics of the new resonators. Increases in the second rotation angle have no significant changes in peaking points but there are indications that improved drift over the OTR can be obtained by proper placement of the support wires on the ls.