Development of precision crystal for satellite use

Bliley Electric Company is working toward development of special precision crystal units for eatellite use under a contract with the Signal Corps Research and Development Laboratories. The project consists of several specific phases, and includes both the evaluatioonf performances attainable at the present state of the art and development of certain new design and techniques. This paper is concerned with the portion of the project which evaluates ruggedized crystal units of conventional types, designed for use without temperature control. It describes sample units, including 5th, 7th, and 9th modes, which if individually selected, can meet the requirements as outlined. A discussion is presented of the pros and cons of temperature compensation methods, and temperature control methods, versus the extreme process control, and individual selection which is necessary with the non-temperature-controlled units.