1931-04-02 — Page 2

HONG KONG DAILY PRESS, THURSDAY, APRIL

1931.

FADIO

ARCTURUS

The Famous Blue Tubes

For Better Radio Reception

Exclusive Features:-

LIFE-LIKE TONE. When you purchased your radio set, you expected to get-clear, life-like reception. That depends on the tubes you use! The exclusive, advanced design of Arcturus Tubes eliminates mechanical background noises-every note, every word, comes in with a vivid Life-Like Tone. With a complete set of Arcturus Tubes in your radio, you know you'll get unusually clear, brilliant programmes. 7. SECOND ACTION.-Arcturus Blue Tubes in your radio set bring in programmes in just 7 seconds -no annoying wait for programmes to begin. Just flip the switch, and by the time you turn the dial, the programme is there-quick, certain, as compared to the usual 30 seconds, or more, wait.

WORLD'S RECORDS FOR LONG LIFE.- Throughout the world, Arcturus Blue Tubes are proving themselves to be. the tubes that have established a world's record for long life. Because. they withstand exceptional overloads that often burn. out other tubes Arcturus Blue Tubes assure the. user of long, satisfactory service,

Ask Us For Demonstration

THE SINOERE Co., LTD.

DISTRIBUTORS.

افر

FEATURES

RADIO STRIDES AHEAD.

TECHNIQUE OF WIRELESS MAINTAINS UNINTERRUPTED

+

GROWTH.

the other hand, is a distinctly new type, which may be regarded as a compromise-between a moving coil and moving-iron speaker.

The emerging signals are then passed through a "shaping circuit" to restore their musical balance.

The principle is certainly in- genious in its conception, and de Instead of moving towards and serves to succeed. The proof of the away from the magnet pole-pieces, pudding lies, however, in the eat 'like an ordinary diaphragma or reed,ing, and one can only wait and see the armatura of the Farrand speaker to what extent the Stenode circuit is arranged to vibrate in a plane will supersede its other competitors paralled with the pole-faces. It is in the field of selectivity. propelled in both directions by mag- notio force, and does not depend upon .A spring reaction. The quality of reproduction is very similar to that given by a moving- coil, the bass register being well in evidence."

--

Goring Fading.

In connection with the selective reception of distant programmes, one difficulty still to be overcome is that of "fading.". Efforts are now being made to eliminate this bugbear by the use of an automatic volume- control device, designed to regulate· the degree of amplification of the first H.F. valve in an inverso sense to the strength of the incoming wave.

Although 1030 has not brought to Inductor Dynamic instrument, on the surface many developments that can be ranked as revolutionary, it has certainly produced a far higher standard of radio efficiency than that in force twelve months ago.

There is an all-round improve ment, whether one judges by the cost of the simplest type of loud- speaker sct, or by the performance of the best receiver money can buy. Present prices are such that no listener need count loud-speaker ro- ception too dear, whilst the man [who enn afford it can purchase greater selectivity and higher quality than ever before.

Mass Production. In the main these things have been made possible by the use of mass production methods in manu factive, by a fall in the cost of raw materials, including valves, and, as a side issue, a reduction in

A part of the received signal is the scale of patent royalties. At

separately rectified and the rectified the same time makers have paid

Through a "Shaping Circuit," current is then used to control the to the careful attention

Briefly, it claims to reucive pro- bias on the grid of the first, H.F. technical details of circuit design.

Finally, the efficiency of the grannes separated only by a few valve. When the incoming cartier. hundred cycles in frequency. This; wave weakens, the negative bins is modern valve, particularly of the if true, drives a coach and four, lesscued, so that the valve amplifies S.G. and Peniode types, has been

through the generally accepted more powerfully, to compensate for. improved beyond all recognition.

The mains driven receiver leads theory of side-band modulation, the falling-off in signal strength, and should make room in the ether Should the signals grow too strong, the way in all-round performance, for ten times the dumber of trans the negative bias on the first valve principally because of the conegut mitting stations now in operation.

is automatically increased and the voltage and, umestricted current

The Stenode eircuit utilises a volume cut down accordingly. The which can be drawn from, the mains, as compared with batteries. super-heterodyne receiver to feed control rectifier" is inserted be the incoming signals through a fore the detector valve, so that it Nevertheless, it has a comparatively

"which is does not affect the degree of gateway restricted market.

controlled either by means of a modulation, or introduce any other piezo-crystal or by a phase-reversing form of distortion. **

(Continued on Page 3.) Oscillator.

more

The Inductor,

In loud speakers there are also one or two interesting innovations to record. The inagno-dynamic type of moving coil speaker, though

Bisnode Radiostat." There is the Stenode Radiostat circuit, of which so much has been heard of late. This new receiver claims to have achieved a standard of selectivity hitherto considered im- possible.

very narrow

not exactly a novelty, has been HAVE YOU HEARD THESE?

greatly improved in operation and compactness, owing to the enor- 'mously powerful çobalt-steel mag: nets now available. The Farrand

TELEFUNKEN

THE WORLD'S BEST RADIO EQUIPMENT

This illustrates an All Mains set combined with loud speaker

GREAT SELECTIVITY

RECEIVES

Manila, Canton, Japan and Local Station.

For Demonstration and further particulars apply to :---

SIEMENS CHINA

Hers are lists of long-waYO' and short-wave stations which should be picked up by anyone in Hong Kong who has a moda. rately good set suitable for 16- ceiving such signals. Success in picking up these stations also depends very largely upon fav. ourablo atmospherle conditions. Readers are invited to add to this list should they succeed in picking up ang station not in- 'cluded in either of these lifts.

LONG-WAVE STATIONS.

WAYA length (Metres) Station

260 Manila 277 Shanghai 280 Tientsio 310 Shanghai 320 Peping 345 Tokyo 353 Hiroshima 355 Hong Kong 347 Bombay 301 Sapporo 304 Keijo

370 Nagoya .370.4 Calcutta

380 Kumamoto 390 Sendai 365 Dairea 308 Rangoon 400 Osaka 410 Contea 413 Manila

SHORT-WAVE STATIONS.

POL

ISAFJ.

967

Call Kilo- Sign cycle K.Z.I.B. 1,163 K.S.M.B. 1,088 C.R.C. 1,070 K.R.C. C.O.P.K. 945 J.O.A.E. 870 850 J.O.F.K

840 Z.B.W.

V.U.B. 840 J.O.I.K 530

820 BIO. 800.9

J.O.D.K. J.O.O.K. V.U.C J.0.0.K. J.O.H.K.

770 J.D.A.K. Yea V.U.R. 764 J.O.B.K. 760 C.M.B 739 K Z.B.M. 790

Tan (Horo Kono)

OF WORKING

6,896 Bunday midnight'

27,110 Daily 0.30.p.m. & 11 p.m.

7810 Not regalar

7,730 Daily 11 p.m.

8,108 Taos, & Fri, 9 pum,il nama,

9239 Not regalar

9,509 Not regular

W.ZIAF: 9,530 | Daily 7-a.m.;

0,020 Fri 8am Sat. 3 am. & 10 am,

-STATION.

CALL SIGN

07.68 Doblats (Germany)

A.F.K.

4,431 Mon., Wed. & Fri, 6 pan. & 2 a m

6012 Khabarovsk (Russia)

B.A.07,

4,990 6-10 p.m.

50.7

Nanon

A.G.J.

5,291 Not reguler

50.

Moscow

L.F.N.

6,000 Tue, Thurs., Sat., 8 p.m.

CO.

43.6

Lowe

1.M.&.

Perth

O.A.G.

41.8

Singapore

V.8.1.4.D.

Kootwijk (Holland)

Office-Pedder Building, 4th Floor..

-87,

·Bangkok (činan).

32.4

Sydney

B.L,

TELE

Showroom-27-Nathan Road, Kowloon.

a165 Melbourne

10.

8148 Bobenectady

$120 Eindhorco (Holland)

P.C.J

EUN

a128 Sydney-

2.1.0.

81.

Nairobi (Konya)-

«-0,077.), Mildaight daily.

KEN

Canton Office...SHAMEEN

28.8

Sydney.fa

2.M.E.

10,620 Not regular.

Systow

GEBR. BOEKE

27.6 Dandoeng

P.LE

11,020 Midnight 3am. daily

26.63 Chelmsford (England)

6,5W,

210

∙16.89 | Bandooog

Manila 23.35 Schonectady

18.4

Kootwijk (Holland)

TELE

17.4

Bandoong

FUN

16.0

·Bangkok g

KEN

103

Kootwijk (Holland)

15.74 Bandoong

P.C.I PL ILE.I.PJ. P.C.L -IPLE,

-18,6

Nanoy (France)

13.98 Pittsburg

V8XK.

21,540 Not regular”

9,500 Not regular

11,751 7,80 pia. & 2 a.m, daily, eraopt

Saturday and Sunday.

KLXX. 12240 Nightly W.Z.X.O. 12,850 4m, Wed, Fri., Bat. PLG. 10.102 Dally 0.30 pm to midnight

10,004 Dally 7-p.m.-

17,280 Daily B p.m. to midnight

17,751 Bundays 7 pm & midnight

18,404 Each afternoon"

19,290 Daily 5.80-7p.m.

19851| Daily & thi

AC-SG3 Set

ENTIRELY MAINS OPERATED

4 penestion in S vairo acte, with 1 watt undistorted outpati enough power for any moving coil or dynamic loudspeaker. A get that will appeal to you whether you are interested in perfect quality from the local station or clear reception from distant stations.

Price only $145.00 Including Mazda Valves (the best Brituß. Valves)

Special B ELIMINATOR for any domestic Bet or made to order for any requirements.

For perfect reception “MAZDA" Valves,

use

large stock newly arrived`

RADIO batteries made by new process minimis- ing deterioration "PERTRIX" 180, 100, 60, 45 volts and C. batteries.

Ebonite "TROLIT" and Pressed Fibre Panels cut in any size. Loudspeakers, and various parts are also obtainable.

For further information apply to

CANTON TRADING ASSOCIATION, LTD.

CHINA BUILDING (5TH FLOOB).

The

TELEPHONÉ 24610.

EVERYTHING 9.E.C. ELECTRICAL

your guarantee

FOR THE HOME WITH ELECTRICITY

HOUSEHOLD

"Magnet"

example from the complete range of

Household Electric ...Appliances.

Irons Kettles Tonsters Cleaners Fans Fres Washing Machines Cookers Grillers Appliances for the Toilet eta

ELECTRIC

APPLIANCE

Magnet

Pedestal Heater Supplied with ayda flexible corf B.C. adaptor

TYPE:T:8 WL.

Allowance must be made for "summer-time" in most “Euro- -pean countries, which is one hour ahead of trug time.

MADE IN ENGLAND by THE GENERAL ELECTRIC

·CO. LTD.

Sold by all leading Electrical

Dealers, Storage ---