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STATION ,. Edited by H GO GERNS www.americanradiohistory.com PILOT JUMBO DOUBLE CHOKE UNIT PILOT COIL WORLD'S LARGEST RADIO PARTS PLANT PILOT 'ILLUMINATED DRUMS DOUBLE AND SINGLE DIALS PILOT ILLUMINATED DIAL VERNIER TYPE PILOT WORLD'S LARGEST RADIO PARTS PLANT PILOTOHM III I METAL PILOT IO-/ GRID PERFECTED CONDENSERS LEAKS WITH BUILT -IN COM PENSATORS TRIPLE. DOUBLE PILOT ADJUSTOGRAD AND SINGLE LOOK PILOT MOISTURE -PRUF TRADE PILOT MICROGRAD TYPES FOR TRANSFORMERS MARK THE PILOT ALL TYPES REGISTERED FREQUENT TESTS AND IN- ELECTRIC (MFG P I L O T ENGINEERS ARE SPECTIONS CONSTANTLY DEVELOPING A NEW SERIES MAINTAIN THE PRECISION OF RECEIVERS IN KIT FORM W H I C H CHARACTERIZES PILOT323 BERRY ST BROOKLYN,NY. EMPLOYING TRIED A N D ALL PILOT RADIO PARTS. ti TESTED CIRCUITS. TRADE MARK i THE PILOT PILOT LEADS PROTECTS PILOTONE THE YOU ALL-ELECTRICAL WAY O u ïi<:`c PILOTONE PILOTONE FRONT PANEL ONE OF THE NEWLY DEVELOP- 'B" ELIMINATOR SIMPLE - BEAUTIFUL ED PILOT KITS. AN A -C DESIGNED ESPECIALLY SIMPLY BEAUTIFUL! JOB WITH PUSH-PULL FOR THE PILOTONE AMPLIFICATION AND A -C RECEIVER BUILT -IN "A" POWER www.americanradiohistory.com Radio News for March, 1929 801, easy ays to Make /3°Oan hour in Your.fpare ¡nItAOlOTime Each of these plans, developed by the Radio Association of America, is a big money -maker. Set owners everywhere want to get rid of static, to have their sets operate from the electric light socket, the tone improved, and the volume increased, and trans- formed into single-dial controls. Phonograph owners want their machines electrified and radiofied. If you learn to render these ser- vices, you can easily make $3.00 an hour for your spare time, to say nothing of the money you can make installing, servicing, repairing, building radio sets, and selling supplies. Over $600,000,000 is being spent yearly for sets, supplies, service. You can get your share of this business and, at the same time, fit your- self for the big-pay opportunities in Radio by joining the Association. Join the Radio Association Earned $500.00 Spare Time Frank J. Deutsch, Penn.: "I have made over$500out ofRadio in my spare time." of America Radio Engineer In One Year Claude De Grave, Canada: "I knew A membership in the Association offers yott A membership need not cost you a cent! nothing about Radio when I joined a the easiest way into Radio. It will enable The Association will give you a com- year ago. I am now a member of a you to earn $3.00 an hour upwards in your prehensive, practical, and theoretical very exclusive organization of Radio spare time -train you to install, repair training and the benefit of its Employ- Engineers, and my income is 225% and build all kinds of sets -start you in ment Service. You earn while you learn. greater than it was." business without capital or finance an in- Our cooperative plan will make it possi- vention -train you for the $3,000 to $10,000 ble for you to establish a radio store. Doubles Income In 6 Months big -pay radio positions - help secure e You have the privilege of buying radio W. E. Thon, Chicago: "Six months afterI better position at bigger pay for you. supplies wholesale from very first. enrolled I secured the managership of at the largeRadioStore and doubled myincome. " ACT NOW -If You Wish the r Radio Association of America Dept. RN -t 4513RavenswoodAve.,Cbicago,lIL No -Cost Membership Plan Gentlemen: Please send me by return mail full details of your Special Membership Plan, and also copy of To a limited number of ambitious men, we will give Special Memberships that your Radio Handbook, may not -need not-cost you a cent. To secure one, write today. We will send you details and also our Radio Handbook filled with dollars- and-cents radio ideas. It will open your eyes to the money-making possibilities of Radio. Name Radio Association of America Address 4513 Ravenswood Ave., Dept. RN -3 Chicago, Ill. City State Please say you saw it in RADIO NEWS www.americanradiohistory.com Rádio News for tl'cich; .1929 YALE WS Y Volume 10 March, 1929 Number 9 HUGO GERNSBACK, Editor -in -Chief C. P. MASON, Associate Editor BERYL B. BRYANT, Laboratory Director C. WALTER PALMER, Director Information Service Contents of This Issue Whither Radio? By Hugo Gernsback 809 The "Dry -Cell Four" - An Economical Radio Cannot Be Heard or Felt 810 Set By B. B. Bryant 833 Real "Radio Mysteries" 811 Hearing RADIO NEWS Blueprints -New Terms of Plants Grow by Radio Our Offer to Readers 837 By Ashur van A. Sommers 812 "It Isn't All in the Set -It's in the Lo- The "Candy Box Special" By Joseph Riley 838 i cation" 813 Radio Echo from the Depths of Space? The Screen -Grid R.F. Tube as an Auto- By C. P. Mason 814 matic Signal -Input Regulator "Miniature Music " -A New Point of View By Donald E. Learned 840 By R. Raven -Hart 815 "Harmonics" - the Cause of Phantom The Wings of Death Short -Wave Stations 841 By C. Sterling Gleason 816 Radio Wrinkles 842 What's New in Radio 818 Figuring the Filament-Ballast Resistances 843 The Radio Beginner- On the Short Waves 844 By C. Walter Palmer 820 RADIO NEWS Laboratories 846 Radio Tubes and Their Characteristics Review of Recent Radio Literature (Part II) By H. M. Bayer 822 By H. M. Bayer 847 What Meters Does the Radio Fan Need? List of Broadcast Station Calls 848 By Robert Hertzberg 824 The Radio Constructor's Own Page 850 The "RAnlo NEWS 1929 Hi -Q" Receiver I Want to Know By C. W. Palmer 851 By Herndon Green 826 131 RADIO NEWS Blueprint Coupon 879 In Our Next Number METHODS OF DETECTION: A simple and under- cussion will be a section devoted to hints on actual standable explanation of the two main methods antenna arrangements. used in broadcast receivers: grid -condenser and CONSTRUCTIONAL ARTICLES: Among the re- leak, and plate rectification. The advantages and ceivers to be the subjects of our blueprint articles disadvantages of each will be listed, and some are a fine seven -tube superheterodyne using screen- practical information on how the systems are best grid amplifier tubes, and an unusually compact used will be given. screen -grid short -wave receiver. The "super" is SHORT -WAVE AERIALS AND GROUNDS: What as sensitive and selective a broadcast receiver as every short -wave should know about can be built to -day, and will appeal to constructors enthusiast radio builders who want the the most important part of his installation -the and custom best. pick -up system. Accompanying the theoretical dis- Blueprint Notice -see page 837 ' RADIO NEWS is published on the 10th of each preceding month. There are 12 obtained from the publishers. Copyrighted in Germany. Reproduction of articles numbers per year. Subscription price is 22.50 a year In U. S. and possessions. in Germany is reserved for Radio, Berlin 92. Canada and foreign countries, 23.00 per year. U. S. Coin as well as U. S. Stamps RADIO NEWS Is for sale at all newsstands in the United States and Canada, accepted (no foreign coins or stamps). Single copies, 25 cents each. Checks and and at Brentano's, Ave. de L'Opera, Paris, France. European agents: S. J. 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