History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1948 02

P.01 - Front Cover
The Australasian Radio World

Registered at the G.P.O., Sydney, for transmission by post as a periodical.

1/-

Vol. 12 - No. 9; FEBRUARY 15, 1948

P.03 - Contents Banner
THE AUSTRALASIAN RADIO WORLD

Devoted entirely to Technical Radio

and incorporating

ALL-WAVE ALL-WORLD DX NEWS

VOL. 12 - FEBRUARY, 1948. - No. 9

P.03 - Publication Notes
Editor, Publisher, Proprietor — A. G. HULL, Balcombe St., Mornington, Vic.

Short-wave Editor — L. J. KEAST, 6 Fitzgerald Road, Ermington, N.S.W. 'Phone: WL1101

Ham Notes By — D. B. KNOCK (VK2NO), 43 Yanko Av., Waverley, N.S.W.

Advertising Representative for N.S.W. - Amalgamated Publications Pty. Ltd., 83 Pitt St., Sydney, Phone: B1077

Representative in Queensland - John Bristoe, Box 82, Maryborough, Q.

Representative in England - Anglo Overseas Press Ltd., 168 Regent St., London, W1.

Subscription Rates: 6 issues - 5/3; 12 issues - 10/6; 24 issues - £1; Post free to any address in the world.

Address for all correspondence - Australasian Radio World, Balcombe St., Mornington, Victoria

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.43)

P.03 - Contents
CONTENTS

TECHNICAL —

Stir in Hi-Fi Circles. . . . 5

Walkie-Talkie. . . . 9

High Fidelity From Crystal Pickups. . . . 15

Hints and Tips. . . . 18

Home-Wound Power Transformers. . . . 19

Converters for "Six" and "Ten". . . . 24

Wanted — An Inventor. . . . 27

The "Teleconda" Powerport. . . . 31

Ham Notes. . . . 35

SHORTWAVE REVIEW —

Notes From My Diary. . . . 38

THE SERVICE PAGES —

Speedy Query Service. . . . 42

P.03 - Editorial
EDITORIAL

It is a lot of fun being a publisher of a technical radio magazine but there are one or two tight corners which you have to be careful to keep out of. To give you two examples, I might mention that quite a number of letters have been received lately which tend towards being abusive (in a nice way, of course) because I won't put down in black and white which I think is the best pick-up, and because I haven't yet published an article on how to make your own wire recorder. The pick-ups are a proper headache. For days past I have been running one of the latest type of amplifiers with triodes and inverse feedback, trying out in turn the "Lexington" and "Connoisseur" pick-ups against my old favourite crystal job which I picked out of a batch after running them on frequency test records with a v.t.v.m. in circuit. There is no doubt about the latest English pick-ups scraping highs off the records which you never hear with ordinary pick-ups, but it is hard to say whether it can be considered desirable, especially with ordinary records. By cutting the highs you can only get back to where you started. A tuned scratch filter seems to be the only answer. Making up a wire recorder at home is a far more complicated job than you might imagine from looking at a diagram which has been sketched out to show the fundamentals of the idea. You can't just use any old bits of wire and you need a lot of precision work of a mechanical nature. — A. G. HULL.