DocumentCode :
1029572
Title :
Pulse Echo Measurements Telephone and Television Facilities
Author :
Abraham, L.G. ; Maggio, J.B. ; Lebert, A.W. ; Schott, J.T.
Author_Institution :
Bell Telephone Laboratories, Inc., New York, N. Y.
Volume :
66
Issue :
1
fYear :
1947
Firstpage :
541
Lastpage :
548
Abstract :
Pulse echo measurements have been used on telephone and television facilities since 1940 to locate impedance irregularities and control quality in manufacture and installation. These sets send a pulse into a line and observe on an oscilloscope the echoes returned from irregularities. The shape and width of the pulse, the rate at which it is repeated and the pulse magnitude are important in determining the accuracy of the results and the requirements of the measuring apparatus. The ``coaxial pulse echo set´´ is used for factory and field testing of coaxial cables. The ``Lookator´´ was developed for use on much narrower band systems such as spiral-four field cable and open wire lines.
Keywords :
Coaxial cables; Impedance measurement; Manufacturing; Oscilloscopes; Pulse measurements; Pulse shaping methods; Shape measurement; Space vector pulse width modulation; TV; 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.1947.5059477
Filename :
5059477
Link To Document :
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