Discussion of 3.0 and 5.0 Mc SBB Crystals Precise and Unform

Bulova Watch Company Electronics Division is currently engaged in developing precise, uniform, SSB crystal units at 3.0 and 5.0 MC, under sponsorship of the USAEC, USAERLDL, Ft. Monmouth, NJ, USA. Bulova's background and experience in the art of fabricating crystals in the region of 1.0 to 5.0 MC, for all applications, including filters, has resulted in the collating and evaluation of quantities of data affecting the uniformity of these crystal units. Data is presented covering the effects of contouring one or both sides of a blank on various physical and electrical parameters of the crystal unit. Particular emphasis is placed on simple relationships, so that a crystal designer with no more than a slide rule can quickly calculate physical dimensions and predict performance with an accuracy no less than that obtained in actual fabrication.