• DocumentCode
    1031865
  • Title

    Crystal Filters Using Ethylene Diamine Tartrate in Place of Quartz

  • Author

    Willis, E.S.

  • Author_Institution
    Bell Telephone Loboratories, Inc., New York, N. Y.
  • Volume
    67
  • Issue
    1
  • fYear
    1948
  • Firstpage
    552
  • Lastpage
    556
  • Abstract
    Ethylene diamine tartrate (EDT) crystal filters were developed to replace the earlier quartz type channel filters in the broad band carrier telephone systems, because of the threatened scarcity of quartz. These new filters give performance comparable to that of the earlier design. The growth of the EDT crystals from seeds and their fabrication into crystal units for use in filters are covered in companion papers on ``Design and Performance of Ethylene Diamine Tartrate Crystal Units´´6 and ``Growing Crystals of Ethylene Diamine Tartrate.´´7
  • Keywords
    Availability; Band pass filters; Crystals; Cutting tools; Fabrication; Frequency; Manufacturing; Speech; Supply and demand; Telephony;
  • fLanguage
    English
  • Journal_Title
    American Institute of Electrical Engineers, Transactions of the
  • Publisher
    ieee
  • ISSN
    0096-3860
  • Type

    jour

  • DOI
    10.1109/T-AIEE.1948.5059709
  • Filename
    5059709
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1031865