Radio today (Apr-Dec 1939)

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-IN THE MO*T PROFITABLE OUTLOOK IN RADIO HISTORY iOSS IEADL IES PROCLAIM THE TRIUMPH OF TELEVISION AS APPLIED BY ENGINEERS OF THE AMERICAN TELEVISION CORPORATION TO SCIENTIFIC EDUCATION AND VISUAL MERCHANDISING. IMAGINE! SURGEONS PERFORM A DELICATE STUDENT DOCTORS LOOK ON BUILDING 300 FEET AWAYt ONE OF THE NATION'S LARGEST DEPARTMENT STORES SHOWS THRILLED CROWDS ITS WARES BY TELEVISING THEM FROM A CENTRAL STUDIO! OPER BOTI SYSTEMS AF E ATC ACHIEVEMENTS. TESTS PROVE TO ELEV SION IS READY FOR 939 S TEL evisioi* S YEAR -YOUR YEAR' ATC NOW PRESENTS VIDEOR. THE MASTER SIGHT-AND-SOUND RECEIVER FOR HOME USE, THAT DREW THOUSANDS OF NEW /ORKERS TO SHOWROOMS OF TOP-NOTCH DEPARTMENT STORES FOR THEIR FIRST LOOK AT TELEVISION. FOUR MODELS. AS AN ADDED FEATURE ATC ANNOUNCES ITS KINET, REMARKABLE PORTABLE TELEVISION EXTENSION. THAT MAKES THE PICTURE VISIBLE AT ANY DISTANCE IN THE HOME AWAY FROM THE MASTER CONSOLE ITSELF A MIRACLE IN TELEVISION Lhwa/iLcAAi IJCua^Ujk Cokfickdtum 130 WEST 56™ STREET NEW YORK, N.Y. Looking ahead in television (Continued from page 20) TRAINED MEN NEEDED IN FIELD J. E. Smith, President. National Radio Institute Guess-and-try methods for servicing television receivers are definitely out. Television receivers have from twelve to twenty-five or more tubes, plus a cathode-ray tube which requires electrode voltages in the order of thousands of volts. Each part and circuit is carefully designed to give the highly complex circuit action required to make an electron beam create an acceptable picture. All this means that an uninformed technician can do more harm to a television receiver in five minutes than a trained man can correct in an equal number of hours. Furthermore, this same tinkerer can do more harm to himself in a split second than all the doctors in the world can correct in an infinite number of hours. Yes, television is no place for untrained men. Effect-to-cause reasoning, sometimes called dynamic testing, will be the backbone of the techniques employed by N.R.I.-trained Teletricians for servicing television receivers. To these men, each observable fault in the reproduced image will tell its own story, pointing to trouble in a particular section, stage or part. More crbouf frequency modulation Editor, Radio Today: In your issue of February, under the heading "Frequency Modulation Still Experimental," you publish an article in which some very serious errors of fact are made. Referring to the use of frequencies of greater than 30,000 kilocycles by this system, the statement is made: "Use of these frequencies restricts operation to the limit of the horizon as with television. Antenna installations are absolute necessities and involve many of the problems found in television." This statement is not true. None of the difficulties involved in television have been encountered in the transmissions from my station at Alpine, nor is reception in any sense limited to the horizon. Several observers located at distances ranging between two or three horizons from the Alpine transmitter have obtained uninterrupted reception at all times for the past year (three horizons is approximately 100 miles). The service is vastly superior to that rendered by the existing 50-kw. broadcast stations. The statement that antenna installations are absolute necessities as in television transmission is likewise not in accord with the facts. Perhaps the best answer to this assertion is the demonstration which was made on March 23rd, 1939, before the Radio Club of America, where a few feet of wire lying on the desk of the lecture hall gave perfectly quiet reception. Yours very truly, Edwin H. Armstrong. Columbia University, New York 42 RADIO TODAY