CRYSTAL UNIT CR-(XM-28)/U.
KEYSTONE CONTROLS CORP NEWARK N J
Pagination or Media Count:
A study was made of the comparative aging rates of glass vs. metal enclosed units. The intent was to establish, if possible, the contributing factors related to crystal unit aging. Control groups were divided so that identifical groups were enclosed in both glass and metal, using various types of mounting clips and bonding cements. The units were aged at 85C. All units were 30mc units. Because of the complexity involved in the design of a system to accomplish the measurements at this frequency, the units were measured at their fundamental frequency of 10.0 mcs.