PRODUCTION ENGINEERING MEASURE: FUNDAMENTAL MODE CRYSTAL FOR FILTERS CR(XM-41)/U
Quarterly rept. no. 6, 10 Aug-9 Dec 1962
PIEZO CRYSTAL CO CARLISLE PA
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Work was continued on the production engineering measurement of fundamental mode filter type crystals CRXM-41U in the 10-30 mc frequency range. During the processing and testing of the 30 mc filter type crystals, about 60 of the cultured quartz units were going out of frequency tolerance during the temperature test. Units of natural quartz manufactured along with cultured quartz remained in tolerances during the temperature run. Investigation revealed that cultured quartz does not have the same temperature coefficient after grinding due to apparent angular shift when crystals have a large amount of quartz removed by grinding. A final design for filter blanks was derived and the preproduction samples were submitted for test.