A HOWARD W. SAMS PUBLICATION DECEMBER 1962 75c FEATURING Mobile Videotape Installation-TWW, England 10 Preventive Maintenance for the Studio 12 Installing Directional Antenna Systems 14 Camera Tube Alignment Using 30 Cycles 26 1962 Subjject Reference Index 32 Broadcast Engineering the technical journal of the broadcast -communications industry www.americanradiohistory.com COMPACT QUAL TI PAC KAGE FOR ITA'S MEDIUM POWER FM TRANSMITTERS Designed for stereo and multiplex operation, ITA FM trans- High Performance Features 5, 7.5 and 10 kw power levels are the most compact, mitters in Silicon Rectifiers fully accessible transmitters sold. Their single cabinet con- Self Neutralized struction requires less than 6 square feet of floor space and Provisions vertical arrangement of components virtually eliminates blind Remote Control spots. 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AVAILABLE FROM YOUR SYLVANIA INDUSTRIAL TUBE DISTRIBUTOR GENERAL TELEPHONE & ELECTRON/CS *) December, 1962 3 www.americanradiohistory.com the technical journal of the broadcast -communications industry Broadcast Engineering Volume 4, No. 12 DECEMBER, 1962 CONTENTS FEATURES Mobile Videotape Installation-TWW, England 10 Preventive Maintenance for the Studio 12 THE S--Lyt-li Installing Directional Antenna Systems (Part I) I4 AUDIO ANNOUNCER Planning a New FM Stereo Station (Part II) 22 tarts on cue, Camera Tube Alignment Using 30 Cycles 26 Stoss when thru- 1962 Subject Reference Index 32 or-lati i ous'j DEPARTMENTS oK ttxu , Let the Audio Announcer be your Letters to the Editor 6 endless magnetic tape loop voice. its rugged, modular construction Technical Talks 16 allows precise voice or signal playback continuously or "on call" as required. About the Cover 28 The Audio Announcer plays the Cousino-patented Echo-Matic car- Engineer's Exchange 30 tridge which provides automatic threading and rewinding of the 37 closed loop magnetic tape. News of the Industry Other models to record and play- back voice and inaudible "beep" New Products 39 trigger tones are available. Or consider the Cousino tape play- 42 ing mechanism for installation Classified Ads into your electronics assembly. Professional Services 42 Fully transistorized- no warm- up or standby power required; Automatic shutoff - with me- "... 1111:....:. tallic foil or silver paint; PUBLISHER: Howard W. Sams GENERAL MANAGER: Mal Parks, Jr. Entirely portable- weighs only EDITORIAL: Executive Editor, Verne M. Ray; Editor, Forest H. Belt; Managing Editor, Stuart Soll; 9 lbs. Consulting Editor, John H. Battison. CIRCULATION: Manager, Pat Tidd; Assistants, Katherine Smith; LaVon Willard. from PRODUCTION: Manager, Robert N. Rippy. ADVERTISING: Sales Manager, John W. Grace; EAST: Charles Horner, Howard W. Sams & Co., York, N. Y., Phone-MU 8-6350; MIDWEST-Hugh Wallace, Howard 99.7J Inc., 3 West 57th Street, New Write today giving details of your W. Sams & Co., Inc., 4300 West 62nd Street, Indianapolis 6, Ind., Phone AX 1-3100; SOUTHWEST- C. H. Stockwell Co., 4916 West 64th Street, Mission, Kansas, Phone-RA 2-4417; LOS ANGELES 57, requirements . to the CALIF., Maurice A. Kimball Co., Inc., 2550 Beverly Blvd., Phone-DU-8-6178; SAN FRANCISCO, "TAPE LOOP PIONEERS" Maurice A. Kimball Co., Inc., 580 Market Street, Phone-EX 2-3365; PARIS 5, FRANCE, John Ash - John 12 Bear craft, 9 Rue Lagrange, Phone-ODeon 20-87; LONDON W.C. 2, ENGLAND, Ashcraft, Street, Leicester Square, Phone-WHitehall 0525; TOKYO, JAPAN, International Media Representa- tives, Ltd., Kisha Kurabu 14, 2 -chame Marunouchi, Phone-(502) 0656. SUBSCRIPTION PRICE: U.S. $6.00, one year; $10.00, two years; $13.00, three years. Outside U.S.A. add $1.00 per year for postage. Single copies, 75 cents. of BROADCAST ENGINEERING is published monthly by Technical Publications, Inc., an affiliate ELECTRONICS Howard W. Sams & Company, Inc. Editorial, Circulation, and Advertising headquarters: 4300 CORPORATION West 62nd Street, Indianapolis 6, Ind. 1 9 4 1 FRANKLIN AVENUE TOLEDO 2, OHIO A HOWARD W. SAMS PUBLICATION BPA BROADCAST ENGINEERING 4 www.americanradiohistory.com GATES OFFERS MOST TOTAL PACKAGE COMPLETE FM STEREO CONCEPT ASSURES PACKAGE 1 IN INDUSTRY MAXIMUM STEREO 1 Gates Cycloid FM Antenna - Designed PERFORMANCE for Stereo 2 Complete Line of FM A complete FM stereo broadcast Stereo Transmitters - from 10 Watts to package - specially engineered to deliver the greatest stereo realism 20,000 Watts possible - is now available from 2 the Gates Radio Company. 3 Gates M-6146 Stereo This exclusive system features a Generator full power range of stereo trans- Gates M-6160 Sub - mitters from 10 watts to 20,000 carrier Generator 67 watts, the new Cycloid antenna with KC or 41 KC. Switch- one through sixteen bays, a dual ing Kit Optional peak limiter, stereo Cartritape, the choice of two stereo audio consoles 4 Gates M-6144 Stereo and two professional stereo turn- 3 Dual Limiter tables (12 or 16-inch)-plus other important accessories that add real- istic depth and separation to broad- cast sound. 5 All equipment in the package was 5 Gates M-6158 Ex- researched, designed and manufac- ecutive transistor tured after the FCC rules and console -10 -channel regulations concerning FM stereo stereo were finalized - yet each product has been extensively field tested. To assure maximum stereo per- formance, the new FM station will 6 Gates M-6188 Stereo want a fully integrated system de- Yard signed specifically for stereo-and is Gates the only manufacturer in 6 the broadcast industry to offer such a complete equipment plan. This total package concept solves the broadcaster's problem of purchas- 7 Gates Stereo ing equipment from several different Cartritape II sources - which could result in an incompatible stereo broadcast system. i Many FM stereo stations already a 8 Gates M-6169 Stereo on the air may find that they are Transistor Pre- not getting full stereo performance 7 amplifier due to an incomplete system. By 8 reviewing the package diagram on the right, they can determine the equipment needed to assure true Gates is the only manufacturer stereo transmission. And the mon- in the broadcast industry to offer 9 Gates CB -500 16 - aural station should investigate to such a complete stereo system. inch & CB -77 12 - inch, with - see how relatively simple and inex- For complete information, write GE VR pensive it is to convert to the "won- 1000 Gray 208S for the FM Stereo Fact File - Stereo Cartridge derful world of stereo" with the yours for the asking. complete Gates package. Arm & Rest Full technical information on this 9 special FM stereo package is now available. Gates Radio Com- GATES RADIO COMPANY Write GATES S. bsidiary of Ilarris-Intertvpe Corporation pany, Quincy, Ill., for the FM Stereo QUINCY. ILLINOIS Fact File. Offices im HOUSTON, NEW YORK, LOS ANGELES, WASHINGTON, In Canada: CANADIAN MARCONI COMPANY (Advertisement) Export Sales: ROCKE INTERNATIONAL CORP. 13 EAST 40th ST. NEW YORK CITY December, 1962 5 www.americanradiohistory.com LETTERS to the editor ----------- DEAR EDITOR: I understand that Harold Ennes has written a book on TV systems mainte- nance. I will appreciate it if you can tell me the name of the publisher, the title of the book, and the price. OVER 1400 SIZES AND TYPES OF IERC HEAT- C. G. ADAIR DISSIPATING ELECTRON TUBE SHIELDS San Antonio, Texas For the benefit of the hundreds who have written, Harold Ennes is currently authoring a 10 -volume "Broadcast Engi- neering Notebooks" series for Howard W. Sams & Co., Inc. The first volume, "Television Tape Fundamentals," is to be published this month, and is priced at $5.95. Several volumes are planned for TV systems maintenance, later in the series.-Ed. DEAR EDITOR: If possible I would like to obtain a reprint of your series, "Audio Studio Maintenance" and "Radio Transmitter ARE EFFECTIVELY COOLING MILLIONS OF Maintenance." HARRY A. ETKIN TUBES, EXTENDING LIFE AND RELIABILITY, Levittown, Pa. Sorry, individual reprints of the arti- cles are not available, but we still have most of the back issues, which are avail- able for just 750 each. If you can hold off just a bit longer, however, you can obtain a booklet containing all the main- tenance series articles with a new or renewal subscription order.-Ed. DEAR EDITOR: I enjoyed reading my article on the WINC Satellite in the October issue. However, I have been besieged with calls AND MAINTENANCE and letters regarding errors in the circuit REDUCING DOWN -TIME diagrams. COSTS IN THOUSANDS OF MILITARY AND On page 30, the battery designations are inaccurate. The top terminal which reads +18 V should, of course, read - 18V, and the terminal below it should read -6V. In the pickup preamplifiers, the coupling capacitors should be 2 in- stead of 200 mfd, and the base resistors should be 82K instead of 8200.