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Underearth Quartz Crystal Resonators

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1 Author(s)
Pendleton, T.A. ; National Bureau of Standards, Washington, D.C.

Advantages of using precision quartz resonators in conjunction with frequency standard oscillators are explained. Advantages of locating the precision-resonators underearth are also described. A method of measuring resonator drift rate with sensitivity of the order of 2 parts in 1010 by means of a direct voltage instead of a high-stability variable oscillator is explained.

Published in:

Proceedings of the IRE  (Volume:41 ,  Issue: 11 )