PEM QUARTZ CRYSTAL UNITS, FILTER LOW FREQUENCY, 1 MC TO 10 MC TYPES CR-(XM-49)/U THRU CR-(XM-52)/U PER SCS-191 DATED 23 JANUARY 1963.
Quarterly progress rept. no. 3, Jan-Mar 65,
PIEZO CRYSTAL CO CARLISLE PA
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The planoconvex design was employed in the Piezo approach to elimination or suppression of unwanted modes, 40db or more, in the region of nominal frequency 5 on 4 Engineering Sample frequencies 1.75 mc, 5 mc, 6 mc and 7.5 mc. For the remaining 10 mc frequency, a flatplate design was employed. A flat-plate design, incorporating a mass loading technique, was introduced at 7.5 mc. Results of this work are also included. Because of encouraging results which were obtained with the mass loading approach at 7.5 mc, the technique has been extended to encompass the 5 mc and 6 mc frequencies, for a total of 4 out of 5 frequencies in the fabrication of the 3rd set of engineering samples.