NAEB Newsletter (Sept 1957)

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TV TECHNICAL TIPS —Cecil S. Bidlack Many television broadcasters have encountered the problem of hum being fed between a mobile TV unit and Telephone Company equipment over a coaxial cable. It can also be a problem when feeding a microwave transmitter over a long coax line on a permanent installation. While going through some recent issues of the SMPTE Journal, I ran across a paper which outlines remedial measures when this problem is encountered. The paper is entitled “Low Frequency Noise Associated With Remote Television Pick Ups” and will be found in the February 1957 Journal. It is a joint Broadcaster/Bell System report sponsored by the Video Transmission Advisory Committee which consists of engineers representing three television networks and AT&T engineers. Seven specific mea¬ sures are listed which may help in eliminating this trouble as well as a discussion of other precautions which may be taken to provide a solution to this vexing problem. ***** Our congratulations to Cyril M. Braum of JCET on his appointment as chairman of the AIEE Com¬ mittee on Television and Aural Broadcasting Systems. “Cy” has supplied us with a list of four papers on the Hagerstown, Maryland, closed circuit educational TV project which were presented at the 1957 Summer General Meeting of the Institute of Electrical Eng¬ ineers. All of these papers are available in published form. The following three numbered papers can be obtained from the American Institute of Electrical Engineers, 33 West 39th Street, New York 18, N.Y., at a cost of 40 cents to members of the AIEE and 80 cents each to non-members: 57-667 “Pioneering in Televised Education” by J. R. Brugger, Board of Education, Hagerstown, Md.; 57-668 “Closed Circuit Networks for Educational Television” by W. C. Warman, Chesapeake and Po¬ tomac Telephone Co. of Maryland, Baltimore, Md.; 57-669 “Television Systems for In-School Teaching” by M. H. Kraus, Jerrold Electronis Corp., Philadel¬ phia, Penn. The fourth paper, “Establishing and Equipping the Hagerstown Educational Television Project” by L. L. Lewis, Educational Administrator, Radio Corp. of America, Building 15-6, Camden, N. J., may be obtained free of charge from Mr. Lewis upon request to him at the above address. ***** While we are on the subject of the Hagerstown experiment, we’ll give you the details on a Mechani¬ cal Reading and Writing Tablet which has been developed by John R. Miles. The photographs below show some of the constructional details and how the machines are used. The overall dimensions are 39" wide x 28" high x 12" deep. The writing surface using a 30" roll of yellow pastel paper is 22 x 30 which gives a 3 x 4 aspect ratio on camera. Three of these machines are in use at Hagerstown and I believe the many ways in which they may be employed is self-evident. They have been used as a Front and Rear View of the Mechanical Reading and Writing Tablet developed by John R. Miles. SEPTEMBER, 1957 7