History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1945 02

3 P.03 - Contents Banner THE AUSTRALASIAN RADIO WORLD Devoted entirely to Technical Radio and incorporating ALL-WAVE ALL-WORLD DX NEWS VOL. 9. - FEBRUARY, 1945. - No. 9. P.03 - Publication Notes PROPRIETOR — A. G. HULL Manager - DUDLEY L. WALTER Secretary - Miss E. M. VINCENT Short-wave Editor — L. J. KEAST For all Correspondence: City Office — 243 Elizabeth St., Sydney, Phone: MA2325 Office Hours — Weekdays: 10 a.m.-5 p.m. Saturdays: 10 a.m.-12 noon Editorial Office — 117 Reservoir Street, Sydney Victorian Advertising Representative — W. J. LEWIS, 379 Collins St., Melbourne, 'Phone MU4725 Subscription Rates: 6 issues - 5/3; 12 issues - 10/6; 24 issues - £1; Post free to any address. Service Departments — Back Numbers, 1 /- ea. post free; Reply-by-mail Queries, 1/- each Printed by Bridge Printery Pty. Ltd., 117 Reservoir Street, Sydney, N.S.W., for the proprietor of the "Australasian Radio World," Elizabeth St., Sydney (Footnote P.36) P.03 - Contents CONTENTS CONSTRUCTIONAL — An Alternating Design . . . . 5 Make Your Own Selenium Cell . . . . 17 TECHNICAL — Square Wave Testing . . . . 11 Aesthetics of Reproduction . . . . 14 Filing Your Resistances . . . . 15 A Short Course in Radio Fundamentals . . . . 20 Voltage Doubling . . . . 25 The Miller Effect . . . . 27 SHORTWAVE REVIEW — Notes From My Diary . . . . 30 New Stations . . . . 31 Loggings . . . . 32 THE SERVICE PAGES — Answers . . . . 34 P.03 - Editorial EDITORIAL. Great interest will be aroused by the announcement in this issue that John Straede is to organise an amplifier contest of his own. Mr. Straede must fully appreciate the problems associated with such an undertaking, but is not deterred. He is buzzing around in his little car in search of advice about the many difficulties which may arise, hoping to nip them in the bud. In order to avoid disputes about the judging it is intended to have the decision reached by the audience as well as by competent judges who are not connected with the radio trade or with prize donors. Six major factors are to be taken into consideration in the judging: (1) volume; (2) freedom from distortion; (3) fidelity; (4) portability and flexibility; (5) accessibility and reliability; (6) cost of building. It is hoped to run a linearity curve for each amplifier submitted, also a frequency response curve, and to measure power output at actual grid current point. Every amplifier enthusiast will agree that the objects aimed at by Mr. Straede are indeed worthy, but many will have doubts about the ability of any single human being to handle the detail work involved in conducting such a contest with a representative entry of from fifty to a hundred amplifiers. To Mr. Straede we extend our best wishes for success to his ambitious proposal, but we hope that he will not be unhappy if, in spite of all precautions, the contest fails to settle the many debatable points about amplifier design and performance. P.05 - Constructional - An Alternating Design P.11 - Technical - Square Wave Testing P.14 - Technical - Aesthetics of Reproduction P.15 - Technical - Filing Your Resistances P.17 - Constructional - Make Your Own Selenium Cell P.20 - Technical - A Short Course in Radio Fundamentals P.25 - Technical - Voltage Doubling P.27 - Technical - The Miller Effect P.30 - Shortwave Review - Notes From My Diary P.31 - Shortwave Review - New Stations P.32 - Shortwave Review - Loggings P.34 - The Service Pages - Answers