STUDY AND DEVELOPMENT OF HIGH TEMPERATURE (300 C) FREQUENCY CONTROL.
Rept. for 1 July 61-1 Jan 63,
GEORGIA INST OF TECH ATLANTA ENGINEERING EXPERIMENT STATION
Pagination or Media Count:
Literature or experimental investigations of possible oscillator devices of high stability over the temperature range -55 to 300 C have been made. AT-cut quartz resonators of 10 Mc fre quency operated satisfactorily throughout the temperature range but the minimum frequency deviations observed were 730 ppm over the range -55 to 300 angle of cut, theta 36 deg. 42 min. and 665 ppm over the range 0 to 300 C theta 36 deg. 48 min.. By summing the frequencies of 10 Mc AC- and 12 Mc BC-cut quartz resonators, of opposite temperature coefficients of frequency change, the deviation was reduced to 185 ppm over the range -55 to 300 C and 80 ppm over the range 25 to 300 C. Angles of cut for AC and BC units respectively were 30 deg. 45 min. and 60 deg. 00 min. for the former pair and 31 deg. 45 min and 56 deg 00 min. for the latter pair. Swept cultured quartz resonators exhibited lower rs changes over the temperature range than natural quartz and therefore maintained a higher Q. Author