1932-03-24 — Page 5

Page

HONG KONG DAILY PRESS, THURSDAY, MARCH 24, 1932.

ALL ABOUT BROAD-tion circuits.

CASTING HOUSE.

NEW EQUIPMENT AT B.B.C.

HEADQUARTERS.

RADIO

There is still plenty of room for improvement in microphones, but

I

think that development in likely to be slow because the conditions which have to he fulfilled are soine- what conflicting.

FEATURES

get the future possibilities in con-

nection with norials, assuming the RADIO SETS OF THE to solve the selectivity, quality

use of the existing wave-bands. If someone could "doviso a radinting system which sent out practically na waves us an angle to the "hori- Perhaps, how.zontal, it would seem that the offer ovor, improvement will come mora

medium wave band would be very tive range of a transmitter on the

materially increased.

Much

by the um of a large number of milerophones, iu

WHY ам to... get over the difficulties of balance," that is to say the res lative incunt of sound picked up from the various performers in a studio.

During the past year or so the activities of the B.B.C. Research Department have been deeply in volved in work winch, although highly important, is not, strictly speaking, rasoaren at all, being more in the nature of design, with This is probably the greatest A strong Tenzarch favour. This diffealty in connection with studio refers to the many and varied prob- Technique at the presont tune. 16 lems in connection with the now i has already been suggested that one transmitting station and the new day special music may be written, headquarters and studios in Lon- taking advantage of the fact that don, as well as miscellaneous depach instrument might theoretically visiopments all over Britain).

be provided with its own miero. phone This, however, is venturing on very dangerous ground: Music has existed for centuries, and is far from being governed. merely by ¡ncientific farts or discoveries,

A Useful Indication. From some points of view this intenss expansion of trelnical equipment is inclined to retard the kind of rewarch which aims at making use of some new principle,

her applicativa: of the old prin

M Two Categories.

The next link in the chain is, of course, the amplifiers of various kinds" microphone.

"line," etc These are aheady very high deve toped, and although improvements mag bis male from the manufactur. ins and economic point of view, it is very doubtful whether one can visualise in the near future im provements which will be obvious

Increasing Service Area, It would not. 10, far as one enn , do away with the difficutly of mutual interference between trans mitters in different countries. How ver, if one could increase the ser Vice area by oxtemding the range at which fading is troublesome, is would become a really sound pro- position to use powers of 100kw.

longtha.

moro

on the medium wave!

Of course, this would mean that afar greater area could be covered by a single channel. A great deal has been done in Europe and in Amorien on this question of angular ¦ radiation, but no one has yet adopt

1.

et a tu regular working proposition

an antenna system which ob viously better than an aerial on more ON loss conventional lines, anch as a plain halfwave radiator..

1

FUTURE.

of the problem to produce selec

I mush sqp the "ideal" solution

tivity with quality with ense of adjustment, looks like defeating us all! Of course, a solution will sort of grow upon us, but I feel, though may be wrong, that it won't spring upon 118 in burst of novelty.

A Comparison !

Wireless act design will evolve similarly to motor-ear design. After all, the motor car is probably the

¡TO-DAY'S problem, because they have seen

WIRELESS

through a great deal of thecraticu} } PROGRAMME.

difficulty to evolve what the user.

wants, not what the technicians

355 METRES.

Americans think nothing of using, think he ought to have. The BROADCAST BY Z.B.W. ON

say ten valves, and using them all thoroughly wastefully,

ry to 11.30 4.m.-Stock quotations. 11.30a.m.-Chinese programme, 12.30 p.m.-European programme of

Victor records.

Aiming at Efficiency.

We soon to think that because high-frequency valve has a theore; tical magnifiention af 200 we oughtp.m-Local time and weather to try and realise this value in! practice. If we only thought to get 1.30 p.m.-Rugby Press nowa, mail! (any) a mag, of 4 par valve nadk used 3 valves we should get (about) the theoretical mag. of qne super. efficient valve

And if we used tuned circuit in most unscientific product that pwing of the ganged condensers won't each of these stages the mis-match- tica engineering, fighting to meet greatly matter, and the shape of popular demand, has ever pro- the response curve will approxim duced,"

ate more, nearly "to an ideal than aay we have to-day.

"band.

report.

notice, etc.

12 p.m.--Close down..

Look at it like this. You want flexibility, so you use what is essen- Thon, nguin, some dear theorist tially a constant speed. engine and realises thas two circuits reactively ask the unskilled user to mani-coupled produce a double humped i pulate complicated gears; you want' resonance curve. So we cry smooth running, so you uso an ex-

pass.

Calculation shows that it is prac plosion to drive you along, and put the engine in front of you intically impossible to got selectivity stead of behind; you want safety, for modern needs using just two so you carry several gallons of eiruuits reactively coupled. Prac Lastly, we come to the questionbighly inflammable material ona, tice shows that the alightest mis- as to whether anything other than vehicle shod with tyres which, on matching of condensers throws all music or speech is likely to be

many roads, have a co-efficient of theory to the winds'; practice shows radiated. There is one-obvious pos- sibility and that is television. It friction so small that the least mis that "there is nearly always some judgment on the part of the usually asymmetry in the response curves untrained driver will result in and that so may easily" "double- collision and/or overturning of the hump the modulation up to 100 per

ciple. On the other hand there is to doubt that the coastant neces. sity of having bo make something new work correctly, without un limited time to do it in, has the

Television Broadcast. effect of indicating where the need

After leaving the serial we aro for improvement Felly lies i

hound to use medium which, Nevertheless, sometimes it does

although it changes its properties lend to too frequent compromises, to the listener.

somewhat from year to your and and this is certainly not desirable. Į

Adjusting Volume, season to season, is quite definitely When there are sufficient funds, ! The same remarks may almost and hopelessly outside our control. research is bent separated from be applied to the transmitter itself, I do not propose to talk about experimental design, but during since it is an established fact that the possibilities of improvements in periods of rapid development it is a transmitter can he made to give receivers and loudspeakers. Here inevitable that all, or nearly all very little distortion indeed. How the rate of growth during the last the staff should be employed on the ever, there is one serious limita rear or two has been phenomenal, more urgent problems.

tion in connection with trans from the point of view of producing mitters, but which also includes re-sound article at a reasonable In considering the future pon-¦ceivers, and that is the fact that price, sibilities of broadcasting from the the ratio of minimum to maximum technical point of view we can sound intensity which is produced divide research into two categories, in the studio cannot be reproduced First there are problemas concerned in the room of a listener. with improvements to existing i This means that somewhere in methods, and, secondly, thare in the the chain, adjustments of the seems almost certain that televi. investigation of new methods alto- volumes chave to be made con.sion will become, an accepted fea getber...

tinuously during mast perform ture of everyday broadcasting one Reviewing the work in hand, ances, otherwise the music would day. there anoms to be considerable ne punetically disappear at certain tivity in both categories, and it times below the background noiss will be interesting to run through of static interference, ete, and at "the chain of apparatas used for others would blast in other words, broadcasting and see what pos-overload the transmitter and re- sibilities there are of change in each | ceiver.. link.

The Human Factor Since it is heyond the power of I think we may fairly assume engineers to improve artistus, the that someone will ultimately devise first thing we come to is the studio, a method by which this adjustment and here there are certainly very can be done seientifically and auto considerable possibilities. The whole matically, even if it remains im- question of studio acoustics is just possible to reproduce the extremes emerging from the purėly empirien) of sound intensity, At present, of strze, and it is only during the last course,

we have to rely on the Vest or two that we have been human element in the shape of making definite measurements of hand control by musicians, who, by much quantitien as reverberation periods, frequency absorption char- aetoristies of materials, etc.

knowledge of the music, вип anticipate what is coming.

It was stated above that com-. We have reached a stage now paratively little improvement cha where we think we can fix the cor- be expected in the transmitter it- rect reverberation time for a studio self. This, of course, does not in of a given size and intended for a chude those improvements in the definita purpose, and we also think engineering side, which may not that we know what shape the re-reveal themselves to a listener. verberation curve should have when This refers particularly to the ap plotted against frequency.

palling inefficiency, from the power Moreover, we have scheduled the point of view, of practically all properties of a very condiderable broadcasting transmitters, muner of materials" which can be Thus, a high quality transmitter used in the finishing and decorat-radiates only about one-fifth to one- ing of a studio. It would be rash, sixth of the power supplied to it, however, to assume in the present and the better the quality it sends stage of development that the re-out the lower the officiency has to verberation characteristics, can be be. This is a problem which we fixed for ever.

have considered for some time past, They are dependent to some ex- but it is not of so much interest tent on the microphone/which may to the listener as it is to the B.B.C., also change, although this change, who have to pay for the power con.. would probably be very graduni,sumed. Again, there is considerable diffor Leaving the transmitlar itself, wo ence of opinion as between our come to the aerials, and at this ideas and those abroad, although stage it is convenient to say some- we seem to agree quite well in this thing about the question of wave- respect with American practice. lengths. Almost everyone who is However, in studios, more than any interested in the technical side of thing clac with which we are con- broadcasting knows that develop verned, one feels that the farther ment is very seriously restricted by ne goes. the more there is to be the fowness of the number of chan dene. It is probable that this, thenels, or, in other words, the wave- microphone end, is where the great est change will take place during the next ten years.

lengths, which are available.

wavelengths (6-8 metres approxim- ately), merely to see whether any- thing can be done to lesson, the dif fioulty by this means.

A Comparison.

However, it would be very rah indeed to try and predict when that day will come, but perhaps we can get some measure of the time re- quired for development if we com- pare the quality of reproduction of music an broadcast eight yeara ago, with the quality of television as broadcast to-day, either in Europe or in the United States. It must, however, always be borne in mind that an arduous beginning has

vehicle and firel

A motor-car is, nevertheless, both useful and practical, and giver a large number of persons a great deal of pleasure. The motor-car balances its inefficiencies in such a way as to become efficient for its purpose.

The wireless set will probably develop, along similar lines. To my

to be made with all ambitious de-way of thinking, the Americans velopments-Mr. N. Ashbride in have evolved by far the best designs Popular Wirelessl

HAVE YOU HEARD THESE?

Here are Hints of long-wave and short-wave stations' which should be picked up by anyone in Hong Kong who has a mode rately good set suitable for re- ceiving such, signals. Succose in ploking up these `stations also depands very largely upon fav. ourable atmospheric conditions. Readers are invited to add to this Hat should they succeed in plaking up any station not in eluded in either of these lista.

WHY!

LONG-WAVE STATIONS.

Call

Sign

bydle

·E.ZI.B. 1,168 K.S.M.S. 1,083

Wave length (Metres) Station

990 Manila 977 Shanghai

!

348 Tokyo J.O.A.K. 070 303 Hiroshima J.O.F.K. 860 355 Hong Kong Z.B.W. 846 357.1 Bombay" V.U.B. 840 381 Sapporo J.O.LK. 830 308 Keijo J.O.D.K. 800 870 Nagoya

J.O.UK 810 V.U.O. 800.8 380 Kamamoto J.O.G.K. 200 J.O.H.K. 770 J.Q.A.K. 780 I.Ó.B.X. 710

C.M.B K.Z.B.M.

370.4 Calcutta

J

890 Bandai

395 Dairen

400- Osaka .410 Cauton "-

480 Menila

SHORTWAVE STATIONS,

BTITION

„Cazt, Bios

Tien (Hona, KoNG) OF WOSKING.

67.88 Dobinte (Germany)A.F.K. 60 13 Khabarovsk (Russia) BA97. 50.7 Nauenw

49.5

Mosco Rome Forth

42.8

Singapore Kootwijk (Holland) 88,8

Bangkok (Biam)

36.2 Bydney

81,55 Melbourne

81.48 Babenectady

81.20 Eindhoven (Holland) P.C.. 31.28 Sydney

Those Seven-Metre. Testa, Moreover, there is a limitation to Development of the Microphone. the number of additional channels 50 Next we come to the microphone which may ever be allotted to itself and fiere it seems at firet broadcasting, if we consider merely sight as though development is those wavelength bands which are. rather glow. Ths carbon type kín ise at present. It is for this microphone, which we still use reason that the B.B.C. is embark- more than any other, has held the ing on experiments on ultra-short field for the last six or seven years. which is very greatly to the credit of the original designer, Dr. E. Reisz, and Captain Round, who introduced nevaral improvements.

At present we are using both this type and the condenser type. There is another microphone in une in Germany which depends on electro-magnetic induction, and in this respect reverts back to the Marconi-Sykes microphone, which was in use are bofore the Marconi- Reisz,

Special Amplifiers. Recently the B.B.C. has done good deal of work in connection with the development of special Amplifera for condensor micro. phonas, as well ha examining the "possibilities of baffles and correo

cannot

Futurs Aerial Developments. There is, no question of existing wavebands being abandoned; be- eause it is already certain that the ultra-short wave-lengths compete with the much longer ones. Nevertheless, there is possibility of development this direction, although here again it will not bo rapid. Before the experimenta even start, it is known that-there- are difficulties, but the interest, lies in the fact that the difficulties are not even greater.

in

When considering this question of wavelength channels and distri bution generally, we must not for

OTE

Сусьв

625

4,484 Mon, Wed, Fri, 6 p.m. & 2.m 4,810 p.m. 6.291 Not regnlar

6,000 Tue, Thurs., Sat, 8p.. Bunday midnight

11 p.m.

3,108 Tue. Br. 9 p.m.-1 a...

9,520 Fri. 8 am, at 8 am. à 10 n.6.

A.G.J.

· E.EN.

I.M.A

6.808

6.A.G.

7,242 Day 8.80p.m.

V.5.1A.E

7,810 Not regular

P.C.L HSAPJ. 2.3.L. B.L.O.

7730 Daily L

9,230 Not reguler

9,508 Not regulas

W.BL.A.F.

0,520 Dally 7am

2.1.0.

9,590 Not regular

$1. Nairobi (Kenya) Bydney 28.0 27.8 Dandoeng 25.68

7.10.

9,877 Midnight daily

2.M.B.

10,626 Not regular

P.LE

Chelmsford (England) BEW.

245 28,85

Manila

H.LX.R

12,240 Nightly

Schenectady

W.EX.O..

12,850 m. Wed., Fri., Bat,

18.88 18.5* 17,4 16.0 10..8

Bradoong

P.L.G.

midnight

Kootwijk (Holland)

F.C.L

Bendowng

Bangkok

Kootwijk (Holland).

165 18.08

Nancy (Franco) Pittsburg

16.74 Bandoeng

P.L.F. H8.1.PJ P.C.K PLE

יד

13,020 Midnight am daily 11,751 7.00 pm. & 3 a.m. dally, stoopt

Saturday and Sunday

16,102 Daily 8.80 p.m. te

16,804 Daily 7 p.m.

17.280 Dally 8 pm, to midnight 17,781 Sundays 7pm & midnight 18,404 Back afternoon,

10220 Dally 6,80–7. p.m. 19,361 Daily & K W.8.I.K. 21,640 Not regular

[Allowane must be made for "ummer-time" in "most" Euro." pean countries, which is one hour ahead of true time,)

cent or more.

It's so typically shortsighted to try out these pin-balanced-on- their end" ideas and not get down to the robust common sense of the

game."

But, and it is a very big but, how can the sensible designer do what he wants to when the price of per- fortnance of, valvos is what it is? I

do not think anyone will dispute the fact that the really multi-gang- ed ralvecoupled tuned circuits give a robust solution to the problem. The sort of solution which says. *hang effeiency! I want stability and common sense and ease of handling."

High Prices Responsible.

CHILDREN'S PROGRAMME.

& to 3 p.m.-European programme. 3 th 5.30 p.m. —**

Orchestral.

"Sous Bois" (Staub).

"Minuot" (Boccharini).-Victor

Concert Orchestra.-2008. "Over the Hills and Far Away"

(Grainger-Schmid). Colonial Song" (Grainger- Schmid).-Victor Symphony Or chestra-38033.2

+

Hudson Waves" (Pignoloni).

The Swing, "Victor Orchestra. --35976.

High Water

Curdy).

A STUDIO

for

MUSIC LESSONS & PRIVATE

PRACHISE

is now

AVAILABLE

at

TSANG FOOK PIANO CO.

at a moderate charge.

The use of a

MORRISON PIANO'

PROVIDED.

(B-MTSANG FOOK PIANO

COMPANY.

"Midnight Reflections" (tal- neck-Signorelli)-Paul White- man and his Concert Orchestra. 11-35092.

5.30 to 6 p.m.-Children's Concert

from the Studio.

6 to 8.35 p. --

Operatic.

Triumphal March from "Sigurd

Jorsalfar" (Grieg).

8, Des Vœux Road, Central (Entrance Ice House Street) Telephone 24848

Queen of Sheba-"Cortege

(Gounod). Victor Symphony Latest Orchestra.-337€3,

Faust-Le parlate d'amore."

(Gounod).

Don Carlos don fatale"

(Verdi)-Margarete Matzenauer (Contralto).-6618.

Cavalleria

Rusticana- 41 Selec-

BRUNSWICK

and

MELOTONE

tion" (Mascagni), Creatore's RECORDS

Band.-35815.

Aida Celeste Aida" (Verdi). Boheme" Racconto di Rodolfo " (Pucori)-Giovanni Martinel

li (Tenor).-6595,

7 p.m.--Stock quotations, mail no-

tice, etc.

Not 8.35 to 7.19 p.m.-

We are driven to try to get every thing out of one stage because ono stage is all we can afford. only that, but these super-officient valves never stay put and are never alike.

The method of massing royalties is a great hindrance to design, but

again it is quite true that it's dif ficult to see how to arrange it else. how and the royalties greatly fo. duced.

I believe we are waiting for nothing other than for the valve. anufacturers to rodüce their prices and produce a low-efficiency stable high-frequency valve make a complete revolution in re-i wiver design technique.

to

Eram then a little close thinking must be done so that the band width of response tends to keep constant over the fu tuning range. Atrendy the America huve solutions for this. I do not know whether they aro successful. I only know that every American sét I live tested in extraordinarily good on the H.F.

side.

***Those Doobie Dóstapars.

|

Contra-wise, the quailty they giro does not approach, our botter designs. Our low-frequency tech. nique is on the whole, very good; our loudspeakers are more pleing thats most of those dooble doom pers" called moving-coil speaksta į“ Atted to the hideous cabinets, de most Tankes selected

Pity we cannot get a set com bining the best of both techniques. I will welcome, and so will you, the first reasonably priced set which goos in for multi-stage HF" and gangs it all up robustly-Captain. Eckersley in Popular Wireless.

Song

A Concert. Solveig's Song" (front 1st Peer Gynt Suite--Grieg). Song-Solvejg's Cradle Song "

(from 2nd Peer Gynt Suite- Grieg).-Lucy Isabelle Marsh (Soprano)-1014.

Violin Solo-Romance in "| (Beethoven).-Jacques Thibaud.

$608:

Voes! Duet "The Moon has Rais'd ber Lamp Above" (Hene- diet)Royal Dadmun and Lam- bert Murphy Vocal Dust" I Know a Bank

the Whereon

Wild Thyme Blows", (Shakespeare and Horn-Olive. Klisé and Elsie Baker,-1083.

Piano Bolo La Campanella"

(Paganfu-Liazt).

Piano Solo Mocturne P Sharp Majoyi (Chopin) Ignice Jan Faderawski.-0823, Song" The Two Grenadiers".

(Schumann)..

Song "Midnight Review" (Glir- ka).-Feodor Chaliapi (Bass).

A ---0010

7.18 to 8 p.

Peristy

---Obtainable.

Com from

THE

BRUNSWICK HOUSE Arcade, Gloucester Bldg,

"St. Margaret's Chimes West-

minstor"-Stanley

Roper.

20020,

Bong-"Sweethearts on Parade."

-Johnny Marvin (Comedian).

21820,..

Band The Jolly Coppersmith Band "Don't be Cross"-Arthur

Pryor's Band--20318, Humorous Song" Ee's So Un-

usual Humorous Song "I'd Do Any thing for You."—Helen Kane 22080.

Duct for Two Pianos" Baga-

muffin."

Duct for Two Pianos."-Dates of the Paper Dolls." Victor AF- den and Phil Ohman,--21929, är Chorus Evenin'." Chorus Comin' Home."

Rovelers.-1907.... p.m.-Local time and weather fe

port...

The

24.03 to 10.30 pan-Chinese Studio

Cogoort.

40.30 p.m.-Rugby mid-day Prem

Vocal Duet Red Lips Kiss Mynews.

Blues Away"-Aileen Stanley 10:33 p-Close 'down, and Johnny Marvin, -20714.

All record in the above Europesa **Impressions of London (est-programmes árs supplied by Messrs

Toad, Tuck Fiano Co.

minster).

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