Gunhardened Crystal Oscillators for Remotely Monitored Battlefield Sensor System
Abstract
The genesis of a temperature compensated voltage controlled (for FSK modulation) crystal oscillator capable of maintaining a 5 ppm accuracy in either FSK state (mark and space) under conditions of 15,000g shock, -40C to +75C ambient temperature and aging for one year is described. The thick film microcircuit oscillator occupies less than 0.5 cubic inches and consumes less than less than 50 mW of power. The development of the requisite crystal unit required a large number of design and processing innovations whose significance, aside from the shock resistance transcends their immediate application to the REMBASS oscillator. Among them is a new family of microcircuit compatible ceramic flatpack crystal enclosures; a laser assisted X-ray goniometer for precision angle measurements; novel surface preparation and cleaning procedures definitized with the aid of high energy electron diffraction, scanning electron microscopy and Auger spectroscopy; and the concept of a novel in-line, ultrahigh vacuum processing facility to assure long term stability. Finite element computer studies aided in the shockproofing of the resonators, and 20 MHz crystal units that survived 36,000g shock and remained within the assigned frequency tolerance at 15,000g have been fabricated.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1976
- Accession Number
- ADA033461
Entities
People
- E. Hafner
- H. Mazurczyk
- J. R. Vig
- S. S. Schodowski
Organizations
- United States Army Communications-Electronics Command