History of wireless telegraphy and broadcasting in Australia/Topical/Publications/Australasian Radio World/Issues/1939 04

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Front Cover

The Australasian Radio World

April 10, 1939; Vol. 3 - No. 12; Price, 1/-

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

Cover Photo: Photo of Cunard White Star Liner "Queen Elizabeth" with S.T.C. Radio Equipment (See Page 8.)

Highlighted Contents: How to Make Home Recordings: Special Marine Receiver Covers All Bands: "Sky-Hawk All-Wave Three": This Thing Called "Q": Latest World Shortwave News: Next DX Contest Closes June 30.

P.02 - Editorial Notes

Editorial Notes . . .

Nil

P.02 - Contents Banner

The Australasian Radio World

Incorporating the

All-Wave All-World DX News

Managing Editor - A. Earl Read, B.Sc.

Vol. 3. - April, 1939 - No. 12

P.02 - Contents

CONTENTS:

How To Make Home Recordings . . . . 3

Standardised Components For Set-Builders . . . . 6

Important New Rola Patent . . . . 7

160 Miles On Five Metres . . . . 8

Club Contests In Full Swing . . . . 10

"Sky-Hawk All-Wave Three" . . . . 12

This Thing Called "Q" . . . . 18

15 To 600-Metre Marine Receiver . . . . 22

The Velco 1939 Mastery Battery Five . . . . 27

Modern Trends In Set Design . . . . 32

What’s New In Radio . . . . 35

Leaves From A Serviceman’s Diary . . . . 37

"Find-The-Fault" Contest For Readers . . . . 38

Shortwave Editor Tests DX Champion Receiver . . . . 40

Shortwave Review . . . . 42

Hundreds Of Constructional Items In Back Issues — Special Offer To Readers . . . . 47

P.02 - Publication Notes

The "Australasian Radio World" is published monthly for the proprietors, Editorial offices, 214 George Street, Sydney, N.S.W. Telephone BW6577. Cable address: "Repress," Sydney. Advertisers please note that copy should reach office of publication by 15th of month preceding that specified for insertion.

Subscription rates: 1/- per copy, 10/6 per year (12 issues) post free to Australia and New Zealand. Subscribers in New Zealand can remit by Postal Note or Money Order.

Printed by Bridge Printery Pty. Ltd., 214 George Street, Sydney, N.S.W., for the proprietors of the "Australasian Radio World," 214 George St., Sydney (Footnote P.48)

P.39 - All-Wave All-World DX News

The All-Wave All-World DX News

Official Organ of the All-Wave All-World DX Club.

World-Wide DX With The “Atlas All-Waver.” I am in receipt of the club badge and certificate, with which I am delighted. May I say th a t “A.R.W.” is the best m agazine ever, and I have been taking it for twelve months now, and always look forw ard to the next copy. Re the “A tlas All-W aver.” I built this up from the “A.R.W.” circuit, and started off by building up the detector and first audio stage w ith the output pentode. In its two-valve form I got fair results w ith pretty good selectivity. L ater on I added the r.f. stage and this seemed to give a decrease in selectivity, w ith a great increase in sensitivity. I am a t a loss to account for this decrease in selectivity though and would like to hear other readers’ views on the subject and also exchange experiences with others who have built this set. Using a P.M. 8-20 Rola speaker, I get plenty of volume on broadcast stations within a radius of 300 to 400 miles. Perform ance is good on short waves, but as I listen mostly on 20 m etres I cannot say much about the other bands. The following is a list of stations received on short waves:— 14 VK2’s, 8 VK3’s, 17 VK4’s 7 VK5’s, 7 VK6’s, 3 VK7’s, 4 VK9’s, 12 ZL’s, 6 K6’s, and XU8NA, VS6AB, CE1AH, OA4AI, ZS2C, XZ2DY, CO7CX, VQ4KTC, ZS2BU, 13 KA’s, 7 W’s, F8KI, G5AK, G8UR, GSF, GSE, KZIM, YLR, also m any others announcing in foreign languages.—B. Beresford (AW483DX), “Windy,” Quirindi, N.S.W. [Re your problem w ith the “A tlas,” you will probably find th a t adding the r.f. stage gives w hat amounts to only an apparent decrease in selectivity. Actually, the appreciable improvement it makes to sensitivity apparently broadens the tuning. The r.f. tuning control will be fairly broad, but the detector tuning should still be sharp. To obtain a still fu rth er improvement in selectivity, try the effect of coupling your aerial lead-in to the receiver through, say, a .0001 mfd. m idget variable condenser. W ith this set approxim ately half out, selectivity will be greatly1 improved, though sensitivity will suffer a little as these two factors are inter-related. Glad to know you are getting such fine results.'—E d.].

QSL Exchange Bureau. The following readers would like to exchange QSL cards w ith other members :— L. R. J. Knighton, 334 Barbadoes St., Christchurch, New Zealand.