A study of the equivalent circuit of quartz crystals
Rust, Charles Clifford
Frey, Austin R.
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The period between 1 January, 1949, and 15 March, 1949, was spent by the author at the R.C.A. Crystal Research' Laboratory at Camden, New Jersey. The Laboratory personnel consists of the following: C. T. Beishline, Laboratory Technician; J.W. Conn, Wireman; L. L. Dimmick, Engineer; P. D. Gerber, Engineer; M. Shaffer, Laboratory Technician; S. Steltz, Toolmaker; E. M. Washburn, Engineer, Laboratory Manager. The division of personnel, and the equipment of the Laboratory, is such as to enable the group to completely fabricate a crystal unit of production or experimental design. This requires ability and equipment to grind to frequency, silver plate, bake at high temperatures, produce mounts and covers, design and assemble oscillator or other circuits; they can also perform highly accurate frequency measurements and impedance measurements in connection with tests involving operation over wide temperature variations, vibration effects, aging, and over-excitation effects. The entire personnel of the R.C.A. Crystal Laboratory was entirely cooperative in familiarizing the author with their problems, equipment, and techniques. The manager, Mr. E. M. Washburn, encouraged work along many lines of inquiry of interest to the Armed Services; he made available to the author the facilities and engineering advice of his department in an investigation of general methods of frequency and impedance measurements of crystals at frequencies from 80KC to 60 MC, and the specific problem to the effect of variations of the interpin capacity of crystals on their stability and activity. Dr. W. D. George of the National Bureau of Standards has shown an inspiring understanding in the field of frequency and impedance measurement, and the author acknowledges the value of his inspiration and assistance.
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