1930-04-01 — Page 11

TUESDAY, APRIL 1, 1930.

The First Prize Whisky

THE CHINA MAIL.

RADIO TOPICS

Red Hackle RADIO

as supplied to

HRH The Lord High Commissioner at Holyrood Palace

Agents:

W. R. LOXLEY & CO.

Proprietors: HEPBURN & ROSS,

Kelvin House, Glasgow.

CHY

LOONG.

NEW SEASON PRESERVED GINGER.

Best quality--Prompt attention to Exporters.

Office: 231, Queen's Road Central, 2nd floor, Tel. Central 2530. Factory:-500-501, Canton Road, Youmuti.

Tel. Kowloon 869.

DAILY CROSS-WORD PUZZLE.

(This cross-word puzzle has been made by an expert but our readers are warned to look out for occasional phonetio spellings, such as harbor, plow, and altho.)

B

13

113

15

6

15

20

24

25

28

130

33

39

C

34

40

43

க

48 49

54

HORIZONTAL

1.A comrade

55

HORIZONTAL (Cont.); 40-8panich title for a

gentleman 41-A small cylinder 7-Pertaining to one's | 42-A metal

4-An exclamation of

surprion

birth

9-Uncanny

11-Very

12-A poem

14-Musical note

16-One (German) 17-To causa'to burst

forth 19-And not

20-A bronze coin of

Romé 21-Free from disease

germs

23-A santinent (abic) 24-A point of compass 26-A draft animal 27-A food fish

(29-An abbot (Fr.)

30-To spit (Dial.)

13-Pause*

34-Ahead

35-Stoepa

38-A call to exclient-

tention

43-Act

45-Tavern 47-Point of compass

(sbbr.) 40-Protrudes the lips 51-Appearing as 17

gnawed .. 154-Payment for pro

fessional services $5-Append

VERTICAL

1-Father

2-Consunted 3-Musical nota 4-Pronoi'n 5-To anoint

Either 7-Clamer

&-Erudition

9-Laminted 10-Hum

VERTICAL (Cont.) 11-A great body of skit

water

13-Dacsiva

15-Period of time 17-Tracts of land 16-An ancient Hebrow

instrument 21-Remains of a fire 22-Square blocks of

wood

25-Poisonous snake 27-The (French) 30-To pry into things

(colloq.)

31-Famous English

achooj

33-Belonging to thee

34-Notovon

:

38-Episcopal (abbr.)

37-To sharpen

39-A unit

44-Hint

48-Turf

| 43-Concerning

|BD-Tellurium (abbr.)' 52-Egyptian sun-god 63-N, W. State of

U.S. (abbr.)

(The solution of the above cross-word puzzle will appear in to-morrow's issue along with a new erosa-word puzzle.)

PENTODE VALVE.

Doubt in Minds of Listeners.

YESTERDAY'S SOLUTION

ARISE BCGS NODES ACRE NDANT ASIA

DABSTER ELSTA AVE NG ELATED

ICES GALEG

FABLES ALL ELD

TONE

10

Thia

TO-DAY'S PROGRAMME

direct

has

current conpoant “nothing to do with the actual opera. tion of the speaker, did, merely acti as a "carrier" far the low frequency Impulses. Because no useful pur- pose can be served by allowing it to How through the speaker windings (in fact, more harm than good may be caused thereby). It is desirable to divert the direct current com-

TELEVISION.

Radio Artistes Heard & Seen for First Time.

PERFECT, TRANSMISSION

London, Yesterday.

ponent, and to permit only, the A new chapter in the history of audio-frequency current to circulate wireless development was in- The following programme will he in the speaker windings:

augurated to-day by a simultaneous broadcast to-day from the Hong Kong

Two methods are available. name-broadcast of sight and sound on Broadcasting Station Z... on 355ly the choke-filter and the output B.B.C. "twin" transmitters. The wireless artistes were soen as well as heard for the Arst time in any country.

meirest-

5-6.30 pm-European Programm

of Columbia Records by Courtesy of Messra. Anderson Music Co. "La Boheme-Selection" (Puccini, arr

Gauwin,

Now Queen's Hall Light Orchestra conducted by Percy Pitt. "Melody Divine, Waltz" (Spencer), "In An Old World Garden, Fox Trot

(Pepper),

The Feur Bright Sparks. March of the Chocolate Soldiers"

(Ashton). "Nelly Grey, Fox Trot"

(Coble and Lutzen),

Ray Starita and His

Ambassador's Band. "Imi Au la Oc (King's Serenade)"

(King).

"Na Lei O Hawaii (Song of the

Islands) (King).

Moana Orchestra. 5.30-6 p.m.-Children's Programme. 6-7 pm-European Programme of Recorded Music continued:- "Second Serenade" (Toselli arr. Gooh!), "Tarantelle for Flute and Clarinet"

(Saint-Saens-Op. 0),

H. G. Amers and the East

bourne Municipal Band. "Dear Love-Fox Trot Medley"

(Wood, Tunbridge & Waller),

Jack Payne and His B.B.C Dance Orchestra.

"Deirina" (Deiro), "Prospero" (Deiro),

Guido Deiro, Accordionista, "Ten For Two" (Younmans and

Caesar),

"I Want To Be Happy"

(Younmans and Caesar).

"What Do I Care"

(Klages, Greer and Caroll), "When You're Smiling"

(Fisher, Goodwin and Shay),

Ted Wallace and His Campus Boys. "Piano Medley of Layton and John

stone Successca,"

Piano Solo by Turner Layton, Sitting By The Window"

(Conrad, Mitchel and Gottler), "Mona" (Conrad, Mitchell and Gottler).

transformer methods.

Choke Fliter

In the choke filter arrangement the anode cireult is split into two alternative paths, one consisting of a low frequency choke, that is to sny, a coil of wire wound on an iron core, and the other of the speaker in series with a condenser.

The iron-cored choke, while per-

mitting the steady direct current to pass through its windings, difèrs an obstacle to the passage of the speech current. The condenser, on the other hand, will pass the varying current impulses but not the steady direct current.

It may be of service to indicate the method of adding choke filter to a set not so fitted. The only addi tional parts

required are a low frequency choks of which several reliable makes are on the market, and a fixed condenser of 2 mfd. capacity.

The Speaker leads should first be disconnected from the speaker terminals of the receiver.

Next, the low frequency choke should be connected to the speaker terminals of the set, and one terminal of the condenser connected to the terminal marked LS. The speaker should now be connected between the other terminal of the condenser and the L.T.-terminal.

The advantages of a filter circuit are four-fold. In the first place

The experimental programme was begun by an official, Mr. J. L. Baird, inventor of the televisor. His features were clearly seen and lips moved as his voice was heard from the loud speaker,

He was then succeeded by Sir Ambrose Fleming, the inventor of the thermionic valve, which made wireless in the home possible.

An address by Lord Ampthill, songa by two well-known artistes, and a talk by the author of "Journey's end,” all of whom were clearly seen and heard, followed.—

Rauter.

presented locally by the Siemens China Co., according a contract. which was signed at the Capital on March 19 between the Central Exe- cative Committee of the Kuomin tang and the German arm.

This powerful station, which is to be of the latest design of the premier German system known as Telefunken, will be able to cover the whole of the Chinese republic as well as contiguous countries. It is understood that radio fans in Europe also will be able to listen-in to this stations.

Just as soon as the construction of the station will be completed, the Chinese broadcasting authorities intend to install a most up-to-date broadcasting jrogramme offering the listeners-in, and particularly the public of China, first-hand and up- to-the-minuto information from the capital city of China.

A German Invitation Inasmuch as the broadcasting station will be entirely Chinese, property once it is erected, and it is the intention of the authorities.

Ipana Troubadours: S. c. many speakers are so arranged that

Lanin, Director.

if the correct polarity is not ob served in connecting up, that is to

say

unless the terminal of the speaker is connected to LST on the receiver, the steady direct 'current component of the anode current will tend to demagnetize the magnets, thus causing the speaker to lose its sensitivity. A choke

Alter, by isolating the speaker winding from the direct current component, avoids this risk. Again, if the speakers The Columbia Photo Players installed at'a considerable distance

run it under purely Chinese "Tropical Hulas" (Cunba),

from the receiver, the long speaker "On The Dreamy Moana Shere"

leads cause a drop in voltage, with management when it begins to (Dyson),

function, the Government is des- the result that the valve will not South Sea Islanders work at its highest efficiency. When of Chinese radia engineers, on patching to Germany a corps "Cigarette, Fox Trot"

used, a (Hargreaves, Damerell & Evans), high anode voltages are

a prolonged inspection trip there, "Moscow. Comedy Fox Trot" ·

choke filter avoids the risk of shock in order that they may have an op- (Hargreaves, Damerell & Evans). through touching the speaker ter-portunity to study the organisation Jack Payme and His B. B. C.minals and eliminates the chance of the German broadcasting service of damage due to worn or faulty and adapt, as far as practicable, insulation of the speaker leads that system to local needs. It is causing a short circuit.

Dance Orchestra.

7 p.m.-Lesson in Cantonese by Rev H. R. Wells.

7.30 p.m.-Experimental Programmé. 8 pn-Chinese Programme relayed from Ko Shing Theatre until end of Play.

9p.m.-Weather Report.

SPEAKER CIRCUIT.

Its Effect on Quality.

Broadcasting is now accepted by the public as a standard means of entertainment and as part of the

to

understood that these Chinese radio engineers have been extended an invitation by some of the leading Germen electric concerns to visit their factories whilst in Europe.

In order that the maximum amount of audio-frequency power for operating the speaker is obtain- ed from the output valve, the im- pedance of the external anode cir-

The transmitting plant of the cuit should be as nearly as possible Nanking broadcasting atation will be equal to the internal impedance of shortly erected near the Yangtze the valve. "Impedance" lathe op- river and two 400 feet self-support- position which a circuit, or deviceing steel masts within the premises In current will form a landmark for China's offers to variationa strength; this opposition depends capital city. upon the frequency of the current fluctuations and is greatest when the frequency is greatest.

Although the choke-condenser, Alter will protect the speaker, It scheme of things. Radio will not make good any wide differ- being no longer looked upon as a

ence betwen the speaker impedance scientific novelty, the mere reception and that of the valve.

normal

Matched

A power plant of 600 horse power I will make the broadcasting station independent of any power supply from the city power plants. All the latest inventions for automatic con- trol and safety devices will be pro- vided for in the station. A special cable will connect the transmitting

situated in the heart of the city of also be made so that all the Gav Nanking, and arrangements will

ernment offices as well as theatres, entertainment-halls, etc., can be

transmitting-station.

of a noise will not satisfy the Impedance can be obtained by using station with the sudio which will be listener. He wants natural repro- an output transformer. |duction, and criticizes receivers and speakers from this point of view rather than on the score of their distance getting capabilities.

Output Transformer The primary of the transformer the loud speaker is connected to terminals of the set, i.a. directly in. the anode circuit of the output.

Pioneer in China's Radio

A radio receiver built on modern valve. The speaker loads are then connected through the studie to the lines and correctly operated in con- joined to the secondary windings. junction with a good balanced

By choosing a transformer having armature or moving cell speaker

a primary impedance equal to that will give reproduction that will of the valve, and a secondary satisfy the most critical musician,

combination they give disappointing

It is of Interest to observe that

radio was introduced into China as far back as 1901, when the fire

Tientsin area worn erected by the station fu the south and in Peking Telefunken company, with whose | co-operation.radio training colleges were also organised.

In spite of all that has been written both in the technical and in the semi-technical Press, there still doubt in the appears to be some minds of many listenera as to the

It sometimes happens, however, that impedance equal to that of the functions of the pentode valve and

although both receiver and speaker desired matched Impedance Is

obtained, its value in a modern receiving set.

are Individually beyond reproach; In Tapped Speaker Windings. Most people are aware that the'

Of considerable assistance in pentode is a power amplifier or "output" valve; that is to say, it is quired by a three-electrode valve of results. This does not mean that matching up impedances is the idea

one or the other must be abandoned,

Most of the major efifes in China the valve the anode circult of which equivalent output rating.

for matters can usually be remedied of providing tappings on the wind supplies the power for operating the means that less low-frequency am- by modifying the method by whics Inge of a speaker. One of the first have at present radio stations, and speaker. Now wherein lies the plification is necessary between the the speaker Is coupled to the last tapped winding speakers on the messages are accepted by the market was the Mullard "Pure Ministry of Communications for detector and the output. valve. As

In the majority of small receivers, Music" speaker. It is fitted to the transmission from one station to sets where only the strong signals the speaker is connected directly in model "E" speaker and also to the another at rates that compete In the first place it must be from the local stations are required, the anode circuit of the power valve unit for home construction. By yourably with telegraph service. means of three terminals at the The equipment to all these radio understood that to "control", pentode can Immediately follow so that the whole of the anode cur back of the instrument, the late tiar stations have been supplied by Telefunken, which company, also three-electrode valve of the super the detector without intermediate power class, that is to say, to permit low frequency amplification. The rent flows through, the speaker.

Now it has been explained on moro can chtaly a resistance to give its full output, it is neces- value of the pentode In this connec

first short-wave radio communica ohrás.

flon between China and Europe by: to apply to its grid a fairly tion will be appreciated from the than one occasion, in this column 1800 ohms, 1,200 ohms or 500 takes the credit for introducing the

alternating signal voltage statement that the Mullard P.M. that the current flowing in the

supplying radio equipment to the Pentones" have amplification fac anode circuit of the last or output

Mukden short wave, station. The

difference between the performance of a pentode and that of a normal three-electrode output valve?

a matter of fact, in many domestic

valve gu

either

se the voltage awing in the circult of the average datector tors up to 82, as compared with valve of a receiver is a combination HUGE RADIO STATION available for application to the about 4 to 6 for normal super-power of steady direct current and a low frequency alternating current which

f the following valve is of the trlodes.

of a volt or so only, it is At the same time, it must be re- fa three-electrode, out-membered that a pentode should not

ive is to be used, to Interpose be substituted for a super-power

1

represents the signals received. The To Be Built at Nanking

by Government.

at one stage of low frequency valve in receivers which already give by the intermediate low frequency tion between the detector all loud-speaker strength, for in stage can be cut out when strong that Htage, PANDERS, MAN, CAses, the pentade would an- signals are being received, --

tedly be overloaded. If It Is Such an arrangement, of course,

fa such makes available e forther degre

Torete Limplification phi

Jon Factor

CHINESE CONTROL.

(A broadcasting- station, rivaling Any other station in the World in size and power, will soon be con- ted at Neuking for the account

company is now erecting short wave

stations in Shanghai, Hankow, and

Tiantein for the Ministry of Com- munications, and, besides, is carry- 'ing cut" tests for transmission of pictures by telephoto from Beflin to Nanking.

It la learnt that the award før the construction of the radio broad- casting - station. In Nanking......... was made to the Telefunken in a face.

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