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TELEVISION NEWS Section Ii!Ci -Itll\ II:S HUGO GERNSBACK, Editor Formerly ULM) I 0 Cita R-

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TELEVISION NEWS Section Ii!Ci -Itll\ II:S HUGO GERNSBACK, Editor Formerly ULM) I 0 Cita R- See Special KAMM TELEVISION NEWS Section iI!Ci -Itll\ II:S HUGO GERNSBACK, Editor formerly ULM) I 0 Cita r- : MID -OCEAN RADIO STATION SEE BROADCASTING & COMMUNICATION TEST IN RADIO - ELECTRONICS - TELEVISION Guaranteed Accuracy PRECISTORS T;, No Other Resistor Combines All These Essential Characteristics != Here, at last, is a deposited carbon resistor ideally suited to the needs of electronic engineers, experimenters, hams and radio technicians. PRECISTORS combine more desirable characteristics than any other type of resistor -and save you money too. Made of pure crystalline carbon bonded to selected ceramic cores, PRECISTORS are particularly recommended for circuits where carbon compositions are unsuitable and wire -wound precisions too expensive. For close tolerance, high stability and economy, use PRECISTORS ... in such applications as:- VOLTMETER MULTIPLIERS VOLTAGE DIVIDERS PRECISTORS are outstanding replacements in all kinds of test PRECISTORS afford opportunity for an endless variety of low - equipment. They are thoroughly reliable, yet inexpensive for powered, precision voltage dividers in innumerable applications. amateurs and experimenters who construct their own special testing devices. SUBSTITUTES FOR WIRE -WOUND PRECISIONS High range PRECISTORS cost but a fraction of the price of high HIGH VOLTAGE BLEEDER APPLICATIONS range wire -wound precisions, and are available in values which Rated at 6000 volts peak, one or two PRECISTORS will replace are not practicable for wire -wound types. Distributor stocks afford entire strings of insulated resistors in television high voltage or a wide selection of values which may be connected in series or similar bleeder circuits. They are especially well suited as bleeder parallel to accommodate an exceptionally wide number of resistors in voltage doubling and tripling circuits. special values, quickly and at relatively low cost. HIGH FREQUENCY REQUIREMENTS Having considerably better frequency characteristics than insu- PRECISION PACKAGING SAFEGUARDS PRECISTORS lated resistors, PRECISTORS may be used to definite advantage IRC PRECISTORS are factory packed in capped plastic tubes in high frequency circuits where resistance value is critical. for complete protection against scratches, jars and surface injury. This special precision packaging also safeguards ELECTRONIC EQUIPMENT PRECISTORS against excessive handling. Characteristics PRECISTORS. are well suited to electronic equipment subject to are printed on the case, and range, type and tolerance widely varying temperatures. Uniform temperature character- are clearly designated on each resistor. istics assure reliable prediction of resistance under such conditions. AUDIO AMPLIFIERS SEND FOR FREE DATA BULLETIN PRECISTORS are especially important in high -gain and high - Full information on IRC PRECISTORS is yours for quality audio amplifiers. Their inherently low noise level and the asking -characteristics, ratings, applications. excellent stability make these pure carbon resistors ideal for Send for your free copy of catalog DC -3 today. low level input systems and for balanced push -pull circuits. International Resistance Co., 401 N. Broad St., Philadelphia 8, Pa. In Canada: International Resistance Co., Ltd., Toronto, Licensee. INTERNATIONAL RESISTANCE CO. 4U eti tef ^,Iw.L t Stau - w- lYi// Show You Now to LEARN RADIOTELEVISION SERVICING OR COMMUNICATIÖNS óy Proelieingin Spare Tiine YOU PRACTICE RADIO YOU PRACTICE RADIO SERVICING COMMUNICATIONS You build the modern Radio I send you parts to build the shown below as part of my Ser- Transmitter shown below as vicing Course. I send you the part of my new speaker, tubes, chassis, trans- Communications former, loop antenna, EVERY- Course. Conduct THING you need to build this actual procedure modern Radio Receiver. Use it of Broadcast Op- to make many tests, get erators, practice practical experience. interesting ex- periments, learn how to put a transmitter on the air. YOU BUILD THIS TESTER as part of my I r Servicing Course, Will Train You at Home with parts N. R. I. sends. It soon with MANY KITS of Parts I Send helps you EARN Want a good pay job in the fast -growing or get a good pity Job in Police. Aviation Radio and Television Industries, or your or Marine Radio, Broadcasting. Public Ad- EXTRA MONEY own money -making Radio -Television shop? dress work, etc. Or think of amazing Tele- fixing neighbors' I've trained hundreds of men WITH NO vision opportunities. Already manufacturers Radios in spare PREVIOUS TRAINING to be Radio tech- are producing over 100,000 sets a month. nielans. Or now you can enroll in my New stations going on the air everywhere! time. NEW practical course In Radio -Television Television Is America's fastest- growing in- YOU BUILD THIS COMMUNICATIONS -learn to be a Broad- Ilustry and men who know tt will be to WAVEMETER casting and Communications technician. You demand. as get practical Radio experience with MANY part of my NEW Convnunicritins GET ACTUAL Course. Use it with KITS OF PARTS I send you in my train -at- LESSON AND BOOK FREE home method. All equipment yours to keep. My DOI -ISLE FREE OFFER entitles you Oscillator you also to actual SAMPLE LESSON and my 64 -page build that furnishes MAKE EXTRA MONEY IN SPARE TIME book. "HOW TO BE A SUCCESS IN RADIO An part of my Radio Servicing Co urse, -TELEVISION-ELECTRONICS," both basic power to I send SPECIAL BOOK - FREE. Mail coupon now. transmitter and de- LETS starting the day you See how quickly, easily enroll. Make EXTRA you can start. J. E. termines transmit- ot t MONEY fixing Radios In VETERANS SMITH. President. Dept. MI apare time while 9NX National Radio Insti- ter frequency. training. tute, Pioneer florae Study Then start your own Its- Get this training without cost Radio School, Washing- Ndio sales and service shop I TRAINED THESE ME under G. I. Bill. Mail coupon ton 9. D. C. Good Job In Radio Sigma Has Own Radio Business "Am Chief En- "Now have gineer of Ra- two Radio dio shops servic- Sttior. Mr. J. E. SMITH, WORD in ing about 200 President, Dept. 9NX charge of four seta month. National Radio Institute, Washington t, D. C. men. Owe all Have largest I know about Radio to service establishment in Mail me FREE Lesson and 64 -page book. NRI." -CLYDE J. BUR- Southeastern Missouri "- (No salesman will call. Please write plainly.) DETTE, Spartanburg, ARLEY STUDYVIN, De- South Carolina. Soto, Missouri. Name Age Address A TESTED WAY City ... Zone State TO BETTER PAY LÍ]('heck If Veteran Approved for Training l'nder G. I. Bill 4 Hugo Gernsback, Editor -in -Chief R.a1D I O - Fred Shunaman, Managing Editor I:lal:/:?It/1SII:S M. Harvey Gernsback, Consulting Editor formerly RADIO -CRAFT Robert F. Scott, W2PWG, Technical Editor InCnrnntne R. H. Dorf, W2QMI, Associate Editor SHORT WAVE CRAFT TELEVISION NEWS RADIO ISION Trademark reglotered U. S. Patent Umca I. Queen, W2OUX, Editorial Associate Chassis Lee Robinson G. Aliquo Angie Pascale, Production Manager General Manager Circulation Manager Wm. Lyon McLaughlin, John J. Lamson Robert Follath Pechnicol Illustration Director Soles Manager Promotion Manager Contents December, 1949 Editorial (Page 21) Electronic Experimentation by Hugo Gernsback 21 Broadcasting and Communications (Pages 22-23) Mid -Ocean Radio Stations ;Cover Feoture) 22 Test Instruments (Pages 24 -25) Test Instruments and the Technician by Herbert S. Brier 24 Television News (Pages 26-30) Filmed Television by Torrence Downey 26 How to Remove the 60 -Cycle Buzz from Intercarrier TV Receivers by L. S. Pearlman 28 Two -Week Course Teaches TV by Dave Gnessin 30 Audio (Pages 31 -33) Speaker Baffling Simplified by A. G. Sonders 31 Audio Squelch Circuits by John L. Gergen 32 UNIT DESIGN Theory and Engineering (Pages 34-37) Electron Shadows Map Force Fields 34 Lead -Pencil Mark Sets Off Relay by Victor H. Laughter 35 FITS ANY CABINET Microwaves, Part VIII -Receiving and Transmitting Antennas for Microwave Communications by C. W. Palmer 36 The most versatile television Construction (Pages 38 -39) Receiver Fits Shirt Pocket by Thomas J. Judge 38 chassis yet designed! Three basic Amateur (Pages 40-41) units - power supply How to Become a Hom, Port III by George W. Shuart, W4AMN 40 chassis, RF chassis and deflec- Cavity Resonator by Rufus P. Turner, K6AI 41 tion yoke assembly - may be Servicing (Pages 42 -64) placed side by side, one above Radio Set and Service Review (Hollicrofters Model S -72) 42 the other, etc., to conform to Instrument Tests Battery Radios by William H. Brakes 44 in AF- Ultrosonic Frequency Meter 45 any cabinet. Simply plug Eight AM Detector Systems 46 the cable connectors. Each Several New Tubes 47 unit is soundly engineered and Advertising and Selling. by T. W. Dresser 48 built to famous National Fundamentals of Radio Servicing, Port X- Triode and Tetrode Tubes standards of performance. by John T. Frye 50 Intermittent Filaments by Dove Gnessin 56 1. Choice of 10" (TV- I OC) or The Intermittent Headache by Mox Alth 60 I21/2" (TV- I 2C) chassis. 2. Tunes Foreign News (Pages 66 -70) all 12 channels. - European Report by Major Ralph W. Hollows 66 3. Wired, pre tuned and tested - not a kit. Electronics (Page 87) Messages Printed by Cathode -Ray Tube 87 4. RF stage employs tuned grid and Departments plate for maximum gain The Radio Month 8 Try This One 84 and optimum bond width. 5. Radio Business IO Association News 86 Unique 36 mc IF minimizes inter- New Patents 72 Miscellany 38 ference. 6. Fine tuning control New Devices 74 People 91 covers range of 2 -3 mc. for Question Box 76 Rodio Electronic Circuits.. 80 Communications 92 maximum tuning accuracy. 7. Technotes 82 Book Reviews 95 Improved intercarrier sound. ON THE COVER: Part of the superstructure of the Coast Guard's Ocean 8. Magnetic deflection and "fly- Station Vessel Spencer, showing the many radio and back's high voltage supply. 9. 72- radar antennas. Kodachrome by Avery Slack. ohm unbalanced and 300 -ohm RADIO. ELECTRONICS.
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