QUARTZ CRYSTAL CIRCUIT ELEMENTS 



461 



explanation for this lies in the fact that the reduction in magnitude of 

 the coupling to transverse vibrations has reduced the transverse 

 stresses which in the F-cut plate are responsible for the fractures. 



Experimental crystals of this type have been produced in the 

 frequency range from 500 kc. to 20 megacycles. The possibility of 

 high frequencies, together with the elimination of the temperature 



2500 



2250 



2000 



1750 



1500 



1250 



1000 



750 



500 



250 







250 



-500 



-750 



-1000 

 -1250 

 -1500 

 -1750 



-2000 



^ 



Y-CUT/ 



AT- CUT (35°) 



20 24 



28 



32 36 40 44 48 52 56 60 64 

 TEMPERATURE IN DEGREES CENTIGRADE 



68 72 76 



Fig. 5 — Frequency-temperature characteristics of AT-cut and Y-cut plates of same 



frequency and area. 

 Frequency 1000 KC. 

 Dimensions: 



Y-cut y = 1.970 mm. x = 38 mm. z = 38 mm. 



AT-cut (35°) y = 1.675 mm. x = 38 mm. z' = 38 mm. 



