Accession Number : AD0015850


Title :   ANALYSIS OF SWISS ETK TELETYPEWRITER


Corporate Author : AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OH COMMUNICATION AND NAVIGATION LAB


Personal Author(s) : SEYMOUR, CHARLES P ; ROSENBERG, LESLIE B ; DWINELL, WILLIAM S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/015850.pdf


Report Date : Sep 1952


Pagination or Media Count : 35


Abstract : An elemental printing technique for error indication in teletypewriter systems was devised by the Dr. Edgar Gretener A. G. of Zurich in which a character consists of a combination of marking bits. Each bit is the result of a finite electrical signal. The machine operated on the asynchronous start-stop principle and utilized a conventional electromechanical printing control system. The character was formed by printing a combination of 14 sign elements, of which a maximum of 5 impressions were required to print any complete character. The rotational torque impressed on the type wheel and another component element was supplied by a 12-v governed motor. A primary power supply of either 110 or 245 vac, or 12 vdc can be used. The equipment may be used with land lines or in conjunction with a radio-telephone circuit, since the output is in the form of an audio tone. The sequence of operation, the functioning of parts, and the operation of a line unit are described in detail.


Descriptors :   *TELETYPEWRITERS , FOREIGN TECHNOLOGY , ASYNCHRONOUS SYSTEMS , SEQUENCES , SIGNALS , WHEELS , OPERATION , STOPPING , POWER SUPPLIES , PARTS , MARKERS , PRINTING , STARTING , ROTATION , TORQUE , AUDIO TONES


Subject Categories : Printing and Graphic Arts


Distribution Statement : APPROVED FOR PUBLIC RELEASE