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Radio Broadcast WILLIS KINGSLEY WING Editor HOWARD E. RHODES Technical Editor EDGAR H. RADIO S FELIX Contributing Editor BROADCAST VOL. XVI. NO. 6 ENGINEERING THE LABORATORY SERVICING Contents for April, 1930 . among other things Review W. K. W. 309 f\T Elmer Brown, who writes in this issue about air- Industrial Changes Problems ^\. craft radio developments since 1929, has been with The News Parade Voice in the Wilderness the RCA as an first at Van Cortlandt Automobile Radio The Pentode Again engineer, Park, Licenses New Models and a Trend New York, and now at Camdcn where he specializes Radio on Trains in competitive receivers, special receivers and equip- An Automatic Record Changer - - - - Thomas E. Piazze 310 ment. He has been with Magnavox, the U. S. Navy, and several West Coast distributors. Jesse Marsten Book Review ----------- Edgar H. Felix 312 admits that just thirteen years ago, he took his first Radio Law by W. Jefferson Davis commercial job in radio at the old Marconi plant at Measurements of High-Frequency Response - Jesse Marsten 313 Aldene, N. J. "Thanks to the U. S. Navy and the work was Tube Manufacturing Equipment in the Ken-Rad Factory, etc. 315 Signal Corps," says Marsten, "enough pro- vided to give us the experience that Mr. Wegeant, The March of Radio ----- An Editorial 316 Interpretation then the chief engineer, promised Carl Dreher and me Radio The of the Pentode Misleading Advertising Coining as compensation for accepting $10 a week. With the Broadcasting Achievement High Power t> City Areas formation of the RCA out of the remains of the Mar- Characteristics of Television - - - C. H. W. Nason 318 Signals coni Company, I joined Dr. Goldsmith's research staff Automobile Receiver Design ----- Robert S. Kruse 320 at C.C.N.Y. This staff was the nucleus of the RCA Technical and Test Department." For the past three High-Frequency Measuring Equipment - H. D. Oakley 324 years Mr. Marsten has been chief engineer of Freeil- - Measurements on Band-Pass Filter Circuits W. T. Cocking 326 Eisemann. During the last eight years C. H. W. Nason - - - has been with Federal and Chas. Freshman The Investor Looks at Radio - - Berkeley A. Cater 329 Telephone Companies in engineering work and has also done some Aircraft Radio - - - Elmer L. Brown 330 Development consulting. He is at present developing television trans- Strays from the Laboratory - Technical Shorts 333 mitter systems and audio-frequency amplifiers for Jen- Sun Spots and Radio A Correction kins. His chief claim to fame is his operation of amateur British Heater Tubes Pentode Articles station SYK and that he was one of the last of the Measuring Percentage Modulation Baron Manfred von Ardenne 334 amateur fraternity to lay down the reactionary banner of "The Spark Forever." Thomas E. Piazze was born in Automatic Volume Control - - - - - A. C. Matthews, Jr. 336 Arequipa, Peru, and came to this country in 1926. He - - - - - "Radio Broadcast's" Engineering Review Sheets 337 is intensely interested in development of mechanical Factors Governing Amplification Calculating Amplification of Pen- devices and for the past eighteen months has been tode Receivers in the mechanical department of the Technidyne Corp. Profesionally Speaking ------------- 339 1930 and Service New Tubes The Balkeil Radio Company, of North Chicago, The Serviceman's Corner ------------ 340 was never in bankruptcy we have been informed R. L. now vice of the Technique of Servicing An SOS to Servicemen by Eglaston, president company. A Hum Filter Two Simple Oscillators It was incorrectly stated on page 251 of our March is- Servicing the Radiola A Legal Question sue that Balkeit was involved in a bankruptcy action. Data on Crosley Sets More "Dope" on Noise This report reached us from a source which we "Radio Broadcast's" Set Data Sheets - 344, 346, 348 believed to be correct and was printed in good faith. We Bremer Tully Models S-81, S-82 Grebe Super-Synchrophase SK-4 greatly regret this occurrence and offer our sincere The Balkeit Model C The Kennedy Chassis No. 10 apologies to the Balkeit Company and its dealers. News of the Radio Industry ----------.350 Set Data Sheet No. 36 in our January issue showing a Tube Makers Defend the Pen- News of the Manufacturers Fada receiver indicated a 171/v tube in the first a.f. tode Matters Legal stage whereas a 227 type is the tube Personal Notes In the Tube Field actually employed. Recently Issued Patents Remote-Control Patents /7T For coming issues we can forecast, in addition to all In the Radio Marketplace - - - Offerings of Manufacturers 354 ^\ our regular features, the following: an article by Radio Broadcast Laboratory Information Sheets W. R. G. Baker, chief engineer of Radio-Victor, on Howard E. Rhodes 356, 358, 360 engineering personnel problems; R. S. Kruse describes No. 337. Measuring Resistance No. 341. Reflection of Sound "R39," a new insulating material; H. D. Oakley, an No. 338. of Distortion No. 342. Grid Current in Tubes Types attenuator for the signal generator; R. C. Hitchcock No. 339. Detection Characteris- No. 343. Power and its Speech for tics Measurement on design data output transformers; Jesse Marsten No. 340. Calculating Detector No. 344. Speech Power and its on measurements of antenna-coupling systems in broad- Measurement Output cast receivers; Baron von Ardenne on a system for tube characteristics The contents of this magazine are indexed in The Readers' Guide measuring vacuum using the to Periodical Literature, which is on file at all public libraries cathode-ray tube. TERMS: $4.00 a year; single copies 35 cents; All rights reserved. Copyright, 1930. in the United Slates, Newfoundland, Great Britain, Canada, and other countries by DOUBLEDAY, DORAN & COMPANY, INC., Garden City, New York MAGAZINES COUNTRY LIFE WORLD'S WORK . THE AMERICAN HOME . RADIO BROADCAST . SHORT STORIES . LE PETIT JOURNAL . EL Eco WEST BOOK SHOPS (Books of all Publishers) . NEW YORK: <LORD"& TAYLOR, JAMES MCCREERY'& COMPANY, PENNSYLVANIA TERMINAL, 10 WALL STREET, GRAND CENTRAL TERMINAL, 51 EAST 44 ST., 848 MADISON AVE., 105 EAST 57TH ST., 370 and 420 and 526 and 819 LEXINGTON AVENUE, > ATLANTIC CITY: <2807 BOAHDWALK> CHICAGO: <75 EAST ADAMS ST> ST. Louis: <310 N. STH ST. and 4914 MARYLAND AVE.> CLEVELAND: <HIGBEE COMPANY> SPRINGFIELD, MASS: <MEEKINS, PACKARD & WHEAT. OFFICES . GARDEN CITY, N. Y. NEW YORK: 244 MADISON AVENUE. BOSTON: PARK SQUARE BUILDING. CHICAGO: PEOPLES GAS BUILDING. SANTA BARBARA, CAL. LONDON: WM. HEINEMANN, LTD. TORONTO: DOUBLEDAY, DOHAN & GUNDY. LTD. OFFICERS . F. N. DOUBLEDAY, Chairman of the Board; NELSON DOUBLEDAY, President; GEORGE H. DOHAN, Vice-President; RUSSELL DOUBLEDAY, Secretary; JOHN J. HESSIAN, Treasurer; LILLIAN A. COMSTOCK, Ass'l Secretary; L. J. McNAUGHTON, Ass't Treasurer 306 RADIO BROADCAST FOR APRIL ^INDUSTRIAL CHANGES Colonial SOME OF the events in the ^ VOICE IN THE WILDERNESS Out of merges with Valley Appliance, of Roch- world of radio in recent the millions of good and earnest words ester, combining, it is said, "the best fea- weeks may have escaped expended at the Cleveland convention tures of each" from sales down through you. A few of the more of the National Federation of Radio engineering. Fulton Cutting is chairman important, to our way Associations came a resolution to enlist of the Board, I. G. Maloff, chief engin- of thinking, are presented the Association actively in the case of eer, and W. S. Symington, president. on this page. better broadcasting. Says the resolution, Magnavox reorganized as a Delaware in part: "... Good broadcasting is the corporation to facilitate, it is darkly by United Motors Service which has 3000 foundation of the radio industry and hinted, a merger. Erla, of Chicago, is authorized service stations and 27 "con- should have our support on all situations of that affect said to be out of receivership; Marti, trol branches" in the United States . arising it, will sell "Be It Therefore that a East Orange, is reorganized and Willard Battery service stations will in- Resolved, sets direct to power companies in and stall and service Transitone automobile standing committee be appointed . near New York. Temple, of Chicago, radios. for the purpose of cooperating with the was bought by a syndicate headed National Association of Broadcasters by Leonard Welling, formerly a New ^ LICENSES: MORE AND LESS. Two and to be ready to make recommenda- tions to this association at time." York Majestic distributor. Bremer-Tully, tube manufacturers signed R.C.A. licen- any Dealer tube or of Chicago, is discontinued as a sales ses, Cable and Perryman. Fourteen tube discounts, policies, organization and present Bremer-Tully makers now hold an R.C.A license. exclusive wholesale territories don't sets are being unloaded. DeForest and Arcturus are not licensed. matter much if the radio listeners don't listen. On January 1, the R.C.A. licenses of ^ THE NEWS PARADE President Hoo- Walbert, of Chicago, were cancelled. the entire THE PENTODE AGAIN News from ver reappointed Radio Com- Shortly after, however, tuned-radio- ^ the trademark U. S. Patent mission, seemingly ignoring the strong frequency and electric-phonograph li- division, Office: "Ser. No. opposition to some members which has censes were granted by R.C.A. to the application 293,289. as Radio of New N. developed, based on their record Story $ Clark Radio Corporation, of Corp. America, York, filed December 1929. Trade Mark: radio administrators. All have been Chicago, and to the Transformer Cor- Y., 5, 'Pentode' for electrical vacuum tubes confirmed by the Senate. Gen. Saltz- poration of America, Chicago. man was chosen chairman. Passage of a and valves. Claims use since November 1929." . R.M.A. Communications Commission Act ap- ^ RADIO ON TRAINS Radio installa- 25, engineering inevitable and this Commission division that the will not pears tions on important trains continue. argues pentode would have radio as one of its com- not only Stromberg-Carlson's automatic-volume- permit any accomplishments possi- ble with tubes.
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