MINIATURE CRYSTAL UNITS FOR SINGLE-SIDEBAND OPERATIONS.
Abstract
This project was concerned with the development and fabrication of miniature crystal units designed specifically to meet the needs of portable, single-sideband communications equipment which utilizes circuit-compensation techniques rather than temperature control to achieve temperature-frequency stability. Experimental crystal units, originally required to use the glass HC-26/U holder, but later including some samples mounted in cold-welded metal cases of the type used for transistors, were in the 5-megacycle to 20-megacycle frequency range. (Fundamental-mode resonators were used up to 10 megacycles, with third-overtones above.) Although crystals meeting these requirements could be fabricated, problems were encountered when these crystals were sealed in the HC-26 glass holders: normal characteristics, particularly temperature characteristics, were frequently distorted so that requirements could no longer be met. Yields were very poor when the flame-sealed HC-26 holders were used, and remained prohibitively low even when the induction-seal HC-26 holders were utilized. It was concluded that production of these units could not attain reasonable yields. However, some experimental units were produced in cold-weld metal holders; these units, although not fully developed during this project, gave promise of meeting the goal requirements with good yields.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1966
- Accession Number
- AD0481807
Entities
People
- J. M. Wolfskill
- Robert Mouck
- Roy Spurlin