1931-06-11 — Page 2

HONG KONG DAILY PRESS, THURSDAY, JUNE 11, 1931.

RADIO

Hear the Golden Voice

FROM THE NEW

FEATURES

CUTTING YOUR RUNNING COSTS.

A FEW TIPS IN THE IMPROVEMENT IN UPKEEP EXPENSES.

PICK UP TROUBLES.

Pick-ups of good make are now. adays fairly satisfactory, but oc casionally you will come across one which gives trouble.

|

"LISTENING." TO BEARINGS,

There are many quaint uses for valves and microphones, but a well- known engineering arm manufaa turing: ball, bearings has thought of new adaption for microphone and LF. amplifiers NAC

Records may soon be ruined by a When bearings are being tested a pick-up out of adjustment. Some microphone is stood, a few inches Although most motorists keep a two-volt accumulater and a Dow much as $15 per 1,000 hours of times the armature is a little too away so that any undue noises set up by the balls in their races is careful account of their running set of valves; it shows, though, that working. In both these examples much to one side, with the result picked up and amplified. The out costs and, at any time, can tell where possible, and unless one which I have worked out from that the movement is restricted input of the ampliñer is connected how much a mile in the expense wishes to use valves of a type not average popular receivers, I have one direction. Instead of thoite reading as any noise is picked & milliammeter which varies in ATWATER KENT RADIO of running their ears, few li, eners obtainable in the two-volt range estimated the cost of current as c.501 needle being able to move to and up by the microphone. In this and

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 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..

great orchestra is build"

Decide for Yourself about Tone!

THE SINCERE

Co.,

LTD.

SOLE DISTRIBUTORS.

The

EVERYTHING (9.8.C.

Figur Zuwéssica

ELECTRICAL

FOR THE HOME WITH ELECTRICITY

HOUSEHOLD

"Magnet

example from the complete range of

·Household Electric Appliances kona Kottles Toestarn› Cleaners Fans Fines Washing Machines Cockers Grillers) Appliances for the Toilet eter

MADE IN ENGLAND

THE GENERAL

CO.LTD.

Sula by all

ELECTRIC

APPLIANCES

"Magnet

Pedestal Heater Supplied with 3 yds. flexible, cord and B.C.adaptor.

take the same bother with their (practically impossible nowadays) | a unit. wireless sets. The probable reason it.is best to use a two-volt accumu- Initial cost is the only drawback,

lator.

is that the cost of running a set in negligible in comparison with the upkeep of even the cheapest car,

be effected.

•

because reliable mains apparatus Prevent Waste,

cannot be made cheaply. At the Again, to prevent waste do not samo time a home-built all-mains but that is no reason why the up-scrap or sell your present small driven set is often cheaper than portunity should not be taken to accumulator, unless it is very old commercial battery-driven set. The work out the running cost agures Reep it as a reserve so that you cost is not so great if you intend and to see whether an economy can will never be without low-tension using the mains only for H.T. and juice while the larger battery want to carry on using accumula- There is no point in wasting is at the charging station. In certors for L.T..! money, and in saying that with the|tain cases it is, over a period of Another problem which often possible exception of some of the eighteen months br two years crops up in whether it is cheaper, latest all-electrio sets (and even cheaper to buy a charger or trickle with an A.0. supply, to use main these are not always above improve- charger and to keep one's batteries valves or to continue with battery ment) every type of receiver is in tip-top condition at home, if the valves and a trickle charger. Quite susceptible to slight alteration not mains are available.

apart from any question of cost, only with a view to getting better results but to cutting out wasteful

in safe to say that mains valves nowadays give a noticeably better is particularly

ехрепвев,

Battery Working.

You must not forget, though, that mains valves can be used, thus doing away with the need for a battery. So far as the H.T. supply performance.". goge, it is dificult to give figurca

fro about its normal position it can move in one direction more freely than the other,

When this fault is present there will be an amount of noise and the reproduction will, of course, be poor. It will usually be possible to adjust the pick-up and to remove the fault,

each set of bearings has to pass a silence test which is also a test of mechanical accuracy,

HOW MANY SETS?

An authoritative analysis places the total number of wireless sabe now in uso at the astonishing figure of 84,030,000, and the value at £200,000,000. Broadcasting. Festimates both in England and A GOOD CHOKE NEEDED.

in the United States agree that conservative Sgure would be thres listeners to every set in use, 80 A fairly good choking coil is that on this basis the number of needed in circuits of the type where listeners may be taken as 72,000,000, the choke is connected in the anode the number of transmitting stations It would be interesting to count up circuit of a valve with a tuned-amateur and professional-in the circuit coupled to it through a

world!

SOME FIGURES!

condenser.

The choke is, in effect, in parallel with the tuned circuit. So it follows that if the choke has losses the tuning is made more broad and the magnification may be reduced

There is a tendency, it seeme, not to regard a choke as of as much

Perhaps, your set works only from because set needs and the perfor the base with low-frequency and batteries. Once a month, or per-mance of H.T. batteries very ac-power valves, the characteristics of haps more frequently, you take the cordingly. Bear in mind that if which are often much better in the accumulator to the charging station, you have no mains available and case of mains heated types than At least every six or seven months must use batteries, it is cheaper equivalent battery valves. There is you find it necessary to buy a new to buy a large capacity battery. H.T. Where, you may ask, is it It should be remembered that also the trouble of arranging the possible to cut down this continual for B.T. work it is always trickle-charging times so that the cheaper to use the mains in prefer-accumulator is not overcharged nor First, it is the cost of the acence to dry batteries, and if you is allowed to drop so that the respect to other parts included in

expense 1

cumulator charge which most direct-{ have electric light in the house and

importance as the rest of the tuned circuit. Actually, a choke bae a fields like any other coil and shielding. is likely to be affected by metal The wiring to the choke, too, is

oke, too. also of "importance. Most chokes the actual effective capacity may be have but little self-capacity, but much greater owing to the wiring and the position of the choke with

ly affects the pocket, although it is do not use it for the wireless act julos "will give out at an awk..the circuit. not the greatest expense, and many you are simply throwing moneyward moment.

actually taken from the maine is

charging stations may have stand-away. Also, us you will find when It is probable that the current ard charges for two, four, and six-you do change over to mains opera volt accumulators, practically irres- tion, you are missing "a great deal pective of capacity. Therefore, ifyou of the convenience of all-electric have a two-volt 30-ampere accumu-operation.

lator, which lasts on your set for If you have the maina and are perhaps a fortnight, it may cost $1 per charge, whereas a two-volt accumulator of double the capacity may perhaps be charged for the

same rate.

I do not say that this is a general practice but if it is the case with your charging station you should take advantage of it and get as many "amperes" as possible for your money. Even where the standard rate does not apply for any capacity, you will find that the increase in charge is not propor- tional to the capacity of the sc cumulator and it is always cheaper so far as running coata go, to have a large battery of a low-voltage,

If you have a new set of four or six-volt valves then, obviously, it would not be in the interests of economy to scrap these and to use

TRANSFORMER TROUBLE.

It is very seldom that anything goes wrong with the modern trans former, though some of the older models used to be a fertile source

buying or building an entirely new set then, without a doubt, the cheapest method of operation is to make the set all-electric-that is, provided the mains are alternating current. In certain cases the dif ference is not so marked with direct-current mains.

Fifty Cents a Unit.

lightly greater when mains valves are used than when a trickle charger is used. At the same time there is so much wastage of power accumulator charging de

备

with any.

vica that in the long run it is bound

to be cheaper to use mains valves.

Where any expansive alteration is contemplated such as changing

over from battery to mains valves, the cost of the conversion must be

I have checked up the perforconsidered in relation to tab num- mance and running cost of several ber of years over which the ap popular mains sets and find that paratus will be used. It stems the average uses between 30-50 watts

and can be run for under Ci per safe to assume now, that A.C. maine hour. The average three-valve supplies are standardised, at volt- mains set, taking all ite, current ages between 200 to 250, and no from the mains, and having a dial body who already has such an A.C. illuminating bulb costs about 8 per thousand houre of working. A

supply will regret buying mains corresponding type working off apparatus, for it is in the nature direct current mains may cost as of an investment.

bursed.

SECRET WAVESI

How to make sure of getting full vatus for your $10 a year dis announcers have taken considerable

exception to this News comes from the New Ter-missal from the human race; of trouble. Of course, now and ritories of & farmer who is using again things will happen. 11 they his wireless loud-speaker set 48 # do, you can be practically certain.

We have every reason to be proud the facts and figures are natually of our own radio industry, but not so big as those of those other countries, America, for instance. the States each year, it is estimat Over 3,000,000 sete are produced in

ed. Steel, in strips and bars, is

the metal mest widely used by the American industry some 110,000 tons being consumed, more than 1,000 of it in the form of screws, in importance, the consumption nuts and washers. Copper is next being estimated at. 12,000, ons. 1,800 tons of pure tin, 1,500 tons Four thousand tons of aluminium, of nickel and its alloys, and 1,900 manufacture of sete, speakers and tons of zince also enter into the

valves.

HAVE YOU HEARD THESE?

Here are lists of long-wave and short-wave, stations which should be picked up by anyone In Hong Kong who has a mode- rately good est suitable for re- ceiving such signals. Success in picking up these stations also depends very largely-upon-far- onrable atmospheric conditions, Headers are invited to add to this list should they succeed in picking up any station not in cluded in either of these lists.

LONG-WAVE STATIONS.

Ware length

Call Kilo (Metres) Station Siga cycle

260 Manila

K.ZLB 1,153

277 Shanghai · · K.S.M.S. 1,083 343

J.O.A.K, 870

Tokyo

asa Hiroshima J.O.F.K. 80. 355 Hong Kong. Z.B.W:- 846 357.1 Bombay-V.U.B. 840 381 Sapporo J.O.I.K. 630

·J.O.D.K... 820 ·

363 Keijo

370 Nagoya

370.4 Calcutta

J.O.C.R. 810 V.U.C. 609.9

380 Kumamoto J.O.GE 700

390 Bendai.

305 Dairen

400 Osaka 410 Canton 480-Manila

SHORT-WAVE STATIONS,

STATION

SIGN

Eindhoven (Holland) PO

JOELK 770..

J.Q.A.K. 780

·J.Ó.B.K.. 780

O.M.B. 788 K.Z.R.M. 025"

TIER (Howa Kona)

WORKING

rare and refreshing says & paper

Dit is rumoured, that local radio

17.88 Dobints (Germany) A.F.E. contrast 10.13 Khabarova (Eussia) BA97,

58.7 Nau 60. Masco 68.5

4,494 Hop Wed & Fri, 6 p.m. & 2. 4,090 6-10pm

A.G.J.

5,291 Not regular 24

EY.N.

summary disfa

38.8 1-Kootwijk (Holland)' 187/

>01.55.

Boma

Singapore

1.M.A. 6.A.G V.8.1A.B.

Bism

POLES ISARJA

Bebenectady

BL

IV.EXAF

9120

81.28 Sydney

ar

Hairobi (Kenya)

7.LO.

29.6

Bydney

278 25.58

Bandoeng

3.ALE PLE

Cheloord (England)

265. Manila

K.LX.E

23.85 Schenectady

18.68

Bandoong

PILG

According to reports, the police have issued orders" that all ·loud-

*IB.4

Kootwijk (Holland)

Bandoeng

F.L.F

10.9 Bangkok

EL.8.1.P.J.

100

Hootwijk (Holland)

[P.O.K

16.74 Bandoung

P.LE

19,290 Daily 6,80-7pm.

18.93

Nancy (France) Pittsburg :-

10,881 Daily 3

W.8.X.K.

91,540 Not sogalar

Friend: What's the idea of the

21.18 flag in the next garden, George Is the chap a Japanese or some thing?1 George: “Oh, no. That's "American millionaire shoots, merely a wheeze of old Brown's for himself while listening in, ran a letting the neighbours know that headline,

he got Yokohama on his Crystal set last night.”

Well, we've always considered local, programmes bad enough,

that the primary winding is the crow, with satisfactory re

Bulte.. one at fault. Breakdown is nearly always dus to the wire being burst out by excessive current, and ainco the circuit of the secondary wind ing of an intervalve transformer is broken by the grid-filament path of the next valve, only a very small amount of grid current can flow on that side of the core. Certainly hot enough to cause a burn-out un- A scientist states that in a hun speakers must be switched off at less, of course, the grid and Ala-dred years' time people will be ment collapso and "short" inside picking up the wireless programmes the valve. In very rare cases elec of to-day And yet some people Does, this apply to mothers-in-16.6 trolytic action may occur between still persist in going in for rejuvena law asks a correspondent...

the two windings, set up by 'mois turo or some other impurity în the insulation, and in this case corro- alon may lead to the wire breaking tither on the primary or secondary aide.

tion treatment.

If we get loud speakers installed everywhere, the sound of the gen- vine human voice will become quite

tunkat.

A Radio Kidnapped," rung i headline in the Glasgow Evening Tinics We wish the one next-door

bad boen..

W210.

5,000 Tue, Thurs, Sat, 8 p.x..

6,800 Bunday midnight

7,142 Daily 6.80p.m. & 11 p.m.

7,610 Not regular"

7760 Daily 11 pm.

8,108 Them & Fri, 9 pm-1am,

530 ot

Not regular 9,630 Daily 7.m

9,0206-Fel, 8 am, Sat. 8 am, & 10: 9,590 Not Teenland S

9,077 Midnight daily

10.526 Not

11,02037 dally de

| 11,761 || 7,50 p.m. 4 8 a.m. dally, except

12240 Fight And Sunday

12,850

Bat

16,102 Daily 8.30 p.m. to midnight 16,804-Iaily 3 pm 1990an (RS. 17.280 Daily S midnight 17,761 Sundays 7 p.m. & midnight 18,404 and afternomm

[Allowance must be pisile for Al summer time pasa countries, which is one hour ahead of trus

In most Burow