Title :
Crystal Filters Using Ethylene Diamine Tartrate in Place of Quartz
Author_Institution :
Bell Telephone Loboratories, Inc., New York, N. Y.
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;
Journal_Title :
American Institute of Electrical Engineers, Transactions of the
DOI :
10.1109/T-AIEE.1948.5059709
