HONG KONG DAILY PRESS. THURSDAY, APRIL 23, 1931.
TADIO
Hear the Golden Voice
FROM THE NEW
ATWATER KENT RADIO
.our
Radio COME to
Department and, let us demonstrate to you the new features of Atwater Kent Radio... Tone Control.. Quick Vision Dial... Mastery of everything on the air... and many other vital points that will interest you.
Listen to our Atwater Kent record. Hear how a' great orchestra is build up-instrument by instrument- -until all parts are blended into Victor Herbert's "March of the Toys." You will enjoy this treat and feel marvellous. Come in! No obligation..
Decide for Yourself about Tone!
THE SINCERE Co., LTD.
SOLE DISTRIBUTORS,
FEATURES
RESISTANCES IN YOUR SET."
SOME STARTLING FACTS ABOUT THE ENERGY IN RADIO RECEIVERS.
should be physically long for it to to be a difficult one for electricity to pass through.
The hardest, path that can be
first-class acrial, will be of incred-offered to an electrical current is ibly tiny dimensions.
All Round the World. The most surprising feet is that
ono composed of an insulating material such as ebonite or mien. Mighty small current flows through such materials, however strong the
It is just as hard to grasp the Obviously, where .. broadcasters real significance of small things as hundreds of miles away are concern it is of objects of colossal dimen. Jed, the electrical energy you can sions. Indeed, there are points collect from the ether, even with a wliere measurements become quite meaningless to most of us, both in very large and extremely tiny things, which yet have vitally im- portant physical characteristics.
We know, for instance, that our it is possible to guide such mis-electrical pressure applied across national wealth runs into thousands croscopic pulsations of power on to them, unless they break down" of millions of pounds, but only the on the grid of the valve of a radio and cease to become "insulators.” leading economists can visualise the set. You'd expect it to get absorb. reality of piles of money like that.ed on the way, wouldn't you ! They are much more moved by their own comparatively trifling bank balance fluctuations than by the discrepancy of an odd ten million or so in the nation's parse!
Diminutive Power,
1.
But electricity isn't like water. Give it a path and no matter how long or how hard that path may be, the smallest pressure of elec- tricity will push electrical energy through it. If you took a giant reet of the thinnest metal wire ever made and joined up one terminal of a sinal Bash-lamp battery, rau the wire right round the world, and then joined the other end of the wire to the remaining terminal of the battery, a current of electricity would flow round that twenty-four thousand mile circuit. (And it would accomplish that journey a fraction of a second.)
A piece of rubber of påper thick- ness will reduce the current flow to the Kame extent as, thousands "of miles of metal wire of the gauge of
human hair.
From all this you will gather that there is no such thing as a perfect electrical insulator, and, that all substances are conductors of elec-
tricity, though some are such bad conductors that for all practical purposes they can be regarded as
conductors.
On the other hand, some so-called insulators are so bad at their job that they tend to step into the category of conductors. That in- indicates that it doesn't do to take things electric too much at their face value]
In regard to diminutive quan tities, wo meet something stagger ingly diminutive in the electrical power the average radiosacrial is able to collect even from a power ful local brandensting station,
Here is a comparison. You know that the ordinary modern valve is reckoned to consume bat a small amount of electrical power in its filament. The most widely used -volt valves take only, one-tenth of
For that matter you could send a an ampere at tro volts. And that equals .2 watts of power (current current to the sun or the moon and back from one call of your L.T. multiplied by voltage). Sixty watts
battery through the finest wire. is a emomon rating, for one single But it would be an infinitesimally electric light bulb such as is cm-emall current, and no measuring in- ployed for illuminating an ordinary strument, however sensitive, would living-room, and that represents be able to measure it, enough power to heat the filaments of three hundred dull-emitter 2-volt radio valves!
But the power generated in an aerial by a broadcaster Biteen or twenty miles away will be some- where around about one millionth of that extracted from an L.T. battery by no more than one valve?
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 CO.
Office-Pedder Building, 4th Floor,
Showroom-27, Nathan-Road,
TELE
Kowloon.
FUN
KEN
Canton Ofoe...SHAMEEN
Bwatow
...GEDE, BOESE
TYPE T33 WL.
It is not necessary that a circuit
Let us turn practical for a mo- ment. A grid leak as ordinarily used in the grid circuit of a detec-
ance. A usual value is two million tor valve, has a very high resist
ohias (2 megohms). To equal that resistance in wire, of quite a stont gauge, you would want a length of wel over a thousand miles!
(Continued on Page 3.)
HAVE YOU HEARD THESE?
Here are lists of long-wave and short-wave stations which should be pleked up by anyone in Hong Kong who has a mode- rately good set suitable for re- celving such signals, Success in picking up these stations also depends very largely upon fav- ourable atmospheric conditions. Readers are invited to add to this list should they succeed in picking up any station not in- cluded in either of these ́lista.
LONG-WAVE STATIONS.
WATO length
Call
Kilo-
I
K.Z.I.B. 1,153
Siga cycle
K.S.M.B. 1,085
|(Metres) Station 900 Masila 977 Shanghai 280 Tientsin
C.R.C.
1,070 310, Shanghai K.R.C. 907 320 Peping C.O.P.K. $45
J.O.A.K. 345 Tokyo
870 353 Hiroshima J.O.F.K. -850 355 Hong Kong Z.B.W. 848 357 Bombay V.U.B. 840 301 Sapporo J.O.I.K. 830 300 Keijo
J.O.D.K. 820 370 Nagoya J.0.0.K. 810 370.4 Calcutta V.U.O 909.8 380 Kumamoto J.O.G.K. 700 390 Sendai J.0.H.K. 770 365 Dairen J.D.A.K. 700 V.U.R. 754 J.0.B.K. 750 C.M.B. 7:28 IZR.M. 728
308 Rangoon 400 Omka 410 Canton 43 Manila
SHORT-WAVE STATIONS.
STATION
CALL BIGN
1.M.A
4.A.G.
CYCLEA
་
TIME (HONG KONG)
or WORKING
4,484 Mon., Wed. & Fri, 8 pan. & 2 am
7,142 Dally 8.80 p.m. & 11 p.DL
7,310 Not regular
7,730 Daily It p.m.
8,108 Tues. & Fri., 9 p.m.-1 nm,
07.06 | Dobintz'(Gormany)
A.F.E. 60.12 Khabarovsk (Buskin) E.4.97. 00.7 Nauton 60----Moscow-
4,000 0-10 p.m.
A.G.J.
6,291 Not regular
RIN
–0,000. Tunt, Thurs. Bat. B p.m.
43.6
6.800 Sunday midnight
42.
Perth
41.3
Singapore
V.8.1.4.D.
38.8
Kootwijk (Holland)
P.C.L
M
Bangkok (Bin)
HSAP.J.
32.6
Sydnoy
"81,36" | Melbourne
31.48 Schenectady
81,26 Sydney
81.
29,& Bydnoy
27.8
Bandoeng
31.20 Eindhoven (Holland)
2.B.L. a.L.O:
9.230 Not r
t regular
9,503 Not regular
W.2.X.A.F. 9,530 Daily 7 am,
7.2.0. Nairobi (Kenya)
9,500 Not regular
P.C.JAN
2.F.C.
D77 Midnight daily
2.M.E.
10,020 Nut regular
PLE
11,020 Midnight—8 nm, daily
Saturday and Sunday.
12,240|| Nightly
12,850 4. Fod., Fri., Sat.
26.68 Chelmsford (England) 6.8.W.
KLXE.
W.2.X.O.
PLG.
24.5
Manila 28.35 Bohenectady.
18.88 Bandoeng
•18,4
Kootwijk (Holland)
P.O.L.
17.1
Bandoong
| P.L.F.
FUN
10.0 Bangkok
10.3
Kootwijk (Holland)
11,761 7.30 p.m. & 8 a.. daily, excopt
AC-SG3 Set
ENTIRELY MAINS OPERATED
A sensation in 8 valve sets, with 1 watt undistorted output; enough power for any moving coil or dynamic loudspeaker. A set 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 British Valves)
Special B ELIMINATOR for any domestic set or made to order for any requirements.
For perfect reception "MAZDA" Valves, large stock newly arrived
use
RADIO batteries made by new process minimis- ing deterioration "PERTRIX" 150, 100, 80, 45 volts and C. batteries.
Ebonite "TROLIT" and Pressed Fibro Panels cut in any size. Loudspeakers, and various parts are also obtainable.
For further information apply to
CANTON TRADING ASSOCIATION, LTD.
CHINA BUILDING (5TH FLOOR).
EVERYTHING
GEC
your guatanies
COSIER FIRES
TELEPHONE 24610.
ELECTRICAL
FOR COSY HOMES
ELECTRIC
Magnet
An example from the -complete range of
-Magneti Household Electric Appliances Irons Kettles Toasters,
Cleaners Fans Fires Washing Machines Cookers. Grillers. Appliances for the
FIR
"Magnet Fire
Current consumption or-zi units an hour. Finished in brown, blue, green, grey or white vitreous enamel,
15/74 Bandoen
18.6 | Nancy (France)
13.03 Pittaling.
ILS.1.P.J.
P.C.K.
PLE
16.10 Daily 450 pm, to nildalght 10,804 Dally 7 p..
17.280 Daily 9 pm, to midnight
|17,761 | Sundayi 7 p.m & midnight
18,604 Each afternoon.
10,220 Dally 2,30—7 p.m. 19051 Daily 8 te
| WALK, ` | 21,540 | "Not ragular
[Allowance must be made for summer-time in most Euro pean countries, which is one 'heur ahead of true time.]
Tollet, etc.
MADE IN ENGLAND by
THE GENERAL ELECTRIC
CO. LTD.
Sold by all ding Electrical
·Dealers, Stor AS, WELL