History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1948 08

3 P.01 - Front Cover The Australasian Radio World Registered at the G.P.O., Sydney, for transmission by post as a periodical. 1/- Vol. 13 - No. 3; AUGUST 18, 1948 P.01 - Rola Ad P.02 - Crown Radio Products Ad P.03 - Contents Banner THE AUSTRALASIAN RADIO WORLD Devoted entirely to Technical Radio and incorporating ALL-WAVE ALL-WORLD DX NEWS VOL. 13 - AUGUST, 1948 - No. 3 P.03 - Publication Notes Published by the Proprietor — A. G. HULL, Balcombe St., Mornington, Vic. Phone: M'ton 344. Technical Editor — Paul Stevens, 21 Fletcher's Av., Bondi, N.S.W. Phone: FW6157 Short-wave Editor — L. J. KEAST, 7 Fitzgerald Rd., Ermington, N.S.W. Phone: WL1101 Ham Notes By — Don B. KNOCK (VK2NO), 43 Yanko Av., Waverley, N.S.W. Advertising Representatives — In N.S.W.: Amalgamated Publications Pty. Ltd., 83 Pitt St., Sydney. Phone: B1077 In Victoria: R. L. McKillop, Regency Advertising Contractors, 60 Market St., Melbourne. Phone M1279 In Queensland: John Bristoe, Box 82, Maryborough, Q. In New Zealand: H. Barnes & Co., 4 Boulcott Terrace, Wellington. In England: Anglo Overseas Press Ltd., 168 Regent St., London, W1. Distributed throughout the World by Gordon & Gotch (A/asia) Ltd. Subscription Rates: 12 issues - 10/6; 24 issues - £1; To N.Z. and Overseas - 12 issues, 12/-; Post free Address for all correspondence - Australasian Radio World, Box 13, Mornington, Vic. Printed by Bridge Printery Pty. Ltd., 117 Reservoir Street, Sydney, N.S.W., for the proprietor of the "Australasian Radio World," Balcombe St., Mornington, Vic. (Footnote P.35) P.03 - Contents CONTENTS TECHNICAL — Converter For Amateur Bands . . . . 5 History of "1933 Standard" . . . . 9 "The Bedside 5" . . . . 13 Loudspeaker Baffling . . . . 17 The American Radio Industry . . . . 19 Exceptional 20 Watt Amplifier . . . . 21 "Long Shot" Economy Beam . . . . 23 Calling CQ! . . . . 27 SHORTWAVE REVIEW — Notes From My Diary . . . . 31 THE SERVICE PAGES — Speedy Query Service . . . . 34 P.03 - Editorial EDITORIAL The next issue will be the special Radio Handbook and Data issue, which will be something quite out of the ordinary, with a great collection of tables, tabulations and lists which you will find useful as a handy reference for many months to come. A large number of extra copies are being printed and circulated but if you are not a regular reader I would strongly recommend you to make a point of placing a definite order for this issue with your local newsagent. Whereas some of our issues have been a few days late in the past, the big September issue is due to come out on time, in fact it is scheduled to reach every part of the Commonwealth by the 15th of the month, which is the date on the cover. Subscribers' copies should be in their hands about a week earlier. The special issue marks the start of a series of improved issues and we have some fine technical articles lined up to follow on in the October and November issues. Among these might be mentioned the mantel model to outdo all mantel models, designed by Paul Stevens and described in detail with full photographs and diagrams, the 1948 World Standard, which gives terrific power with exceptional fidelity, yet costs only a few shillings more than an ordinary set, a new 45-watt super-quality amplifier, and last, but not least, the sweetest of low-powered amplifiers. This last item is a modest affair but has the following performance when laboratory checked: frequency response flat with half a decibel from 10 c.p.s. to 18,000 c.p.s., and total distortion less than .15 per cent, when delivering an actual 2.7 watts to the voice coil! This is the answer to those who deplore the use of high-powered amplifiers for home use. — A. G. HULL. P.05 - Technical - Converter For Amateur Bands P.09 - Technical - History of "1933 Standard" P.13 - Technical - "The Bedside 5" P.17 - Technical - Loudspeaker Baffling P.19 - Technical - The American Radio Industry P.21 - Technical - Exceptional 20 Watt Amplifier P.23 - Technical - "Long Shot" Economy Beam P.27 - Technical - Calling CQ! P.31 - Shortwave Review - Notes From My Diary P.34 - The Service Pages - Speedy Query Service