1930-06-26 — Page 2

HONG KONG DAILY PRESS, THURSDAY, JUNE 26, 1930.

HAVE YOU HEARD THESE?

Here are liata 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. Success in picking up these stations also depends very largely upon tay- 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.

01.06

RADIO

LONG-WAVE STATIONS.

Wave length (Metres) Statio 260 Manila" 277 Shangbai 280 Tientsin 310 Shanghai 340 Peping 343 Tokyo 333 Hiroshima 335 Hong Keng 357 Bombay 301 Sapporo 300 Kaijo

Call Kilo- Siga cycle K.Z.L.B. 1,153 K.S.M. S. 1,085 C.R.C. 1,070 K.R.C. 967 C.O.P.K. 945 J.O.A.K. 870 J.O.F.K. 530 Z. B.W.. 546 V.U.B 840 J.O.LK $30 J.O.D.K. $90

370 Nagoya J.O.C.K. $10 370.4 Calcutta. V.U.C. 509.0 350 Kumamoto J.O.G.K. 790 300 Sendai LO.H.K. #10

J.D.A.K. 365 Dairen

760 V.U.R 734 T:O.B.K. 750 C.1.8. 739 K.Z.R.M,

358 Rangoon

400 Oxaka 410 Canton 413 Manila

SHORT-WAVE STATIONS.

STATION

CALL SIGN

Dabiatz (Germany)

A.F.K.

6012 Khabarovsk (Russia) R.A.97.

56.7

Nazon

A.G.J,

50.

Moscow

R.F.N.

43.5

Rome

1 M.A.

42.

Perth

0.A.G.

41.3

V.3.1,A.B.

35.9

Kootwijk (Holland)

P.C.L

37.

Bangkok (Siam)

Sydney

Melbourne

32.0

31.56

Singapore

31.48 Schenectady

Bindhoven (Holland)

31.20

11.28 Sydney

31.

Nairobi (Kenya)

26.5 Sydney

27.9 Bandoeng

HS4.P.J.

2.3.1.

Z.D..

011

Timx (Honɑ Kova) OT WORKING

964

4,431 Mon.. Wed. & Fri, 6 p.m. & 2 am, 4,900 6-10 p.m.

5291 Not regular

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

6.506 Sunday midnight

7,142 Daily 8 20 pm, & 11 p.m. 7,310 Not regular

7,730 Daily 11 p.,

8.108, & Fri, 0 p.m.-1 a.m. 0,230 Not regular 9,503 Not regular

W.2.X.A.E. 9,530 Daily 7 AD.

3,620 Fri. 9am., Sat. 3 am, & 10a.m. 9.500 Not regular

F.C..

F.C.

I.D.

0,677 Midnight daily

2.31.5.

Ines Not regular

P.L R.

25.53 Chelmsford (England) 5.S.W.

11,020 Midnight-3 a.m. daily 11,761 7.30 p.m. & a.m. daily, except

Saturday and Sunday

12,800 4. Wed., Fri., Bat 11,102 Daily 5.30 p.m. to midnight 16,304 Daily 7 p.m.

24.5

Masil

K.1.X.R.

12,240 Nightly

23.35 Scheoectiuly

W.2.X.O.

18.58 | Beadoong

P.L.G.

18.4

17.4

Kootwijk (Holland} Pardoebg

P.C.L.

P.L.F.

10,0

Bacgkok

18.88 Huizen (Holland)

Kootwijk Holland)

P.C.K

15,74 | Bandoeng

Nancy (France)

18.3

*15.5

13.93. Pittsburg.

HS.1.P.J. P.FJ.

P.L.E.

WAXK.

17.280 Daily 8 pm to midnight 17,751 Sundays 7 p.m. & midnight 17,760 Delly 10 pas

18,10s Esch fternoon

19,220 Daily 7.30-7 p.m.

10,331 Daily 3 m.

21,540 Net regular

NOT A

FEATURES

FURTHER DEVELOPMENT OF THE

PICK-UP.

POINTS ON SELECTING A SUITABLE INSTRUMENT.

Such rapid strides have been taken in the development of the magnetic pick-up during the last year or two that instruments are now on the market capable of bringing to any radio enthusiast in possession of a gramophone turn, table the most perfect means of sound reproduction science has yet evolved.

It has, in fact, become almost as essential a part of a "radio-receiver as the loud speaker, and few radio- set users are without this means of putting their

programmes through the receiver.

Own

BY COHERER."]

Such a practice was, of course, cumbersome and lacked precision. Recent models have overcome the difficulty by using a very light material for the casing of the unit. thereby bringing its weight. to a less harmful figure."

Importance of Weight.

The weight of the instrument is still an important point, and even some of the present makes appear to and it difficult to strike a médium between tearing" the

record and being so. light as to jump a groove or fail to respond to some of the higher frequencies Recent developments have on-recorded on the disc. Some of the centrated on improving the damp distortion at certain frequencies with the cheaper models is due to ing rystem which, as mentioned in last week's article, presented an a tendency to make the instrument early difficulty. Another problem too light. It should be borne in that was overlooked in original de-mind that the sounds are recorded signs was the weight of the instru- on the sides of the groove, and where the seedle has insufficient weight to bear it down the finer frequencies are apt to be poorly reproduced, while a heavy passage is liable to cause the pick-up to jump a geove.

ment.

Record Wear... "More than one manufacturer was compelled to withdraw early instru. ments from the market after being put into production, owing to the weight of the instrument "tearing" the record after being used a lew times Drastic measures were

taken to overcome this and, as a robust and therefore heavy magnet was necessary in the unit, a means of counter-balancing by an adjust- able weight on the support arm was considered in many cases the hest way out of the dificulty.

יו.

J

NOTE IS LOST-

So Perfect are the Reproduction Qualities

If a LOEWE FE 63 9 tube

s

is used

REQUIRES FRAME AERIAL ONLY WITH NEW BARIUM TUBES, CAN ALSO BE USED WITH LOEWE SHORT WAVE ATTACHMENT.

Demonstration Hours ----

11-11.30 a.m. 12.30-1.30 p.m.

set

5-5.30 p.m. given

During demonstration bours expert European advice

on all -Wireless matters.

Loewe R 533 A.C. set $126 without Loud Speaker, with Loud Speaker $150-

gives splendid volume.

"Pertrix High Tension Dry Batteries

150 volts, 100 volts, 60 volts and 45 volts. Heavy Super Duty

and Grit Batteries 9, 12 and 30 volts.

NEW PARTS, RECEIVING SKT8 and LOUDSPRAKERS.

CANTON TRADING ASSOCIATION, LTD. CARL SCHROTER, Manager 5TH FLOOR, CHINA BLDG. TELEPHONE""24610,"

Pick-Up Bata.

To such an extent is the pick-up being adopted, and so critical are radio amateurs becoming, that manufacturers of this instrument find it necessary to issue a leaffèt, as with the valve and other radio components," explaining the per- formance of the instrument nader different loads. In selecting a pick-up the main point to observe is ta selectivity at different fre- quencies, and in this respect a study of the printed matter sup- plied with the instrument is essen. tial. With a good makes a graph or chart is supplied showing the

¡cond groove, it is necessary that they receive a corresponding in- crease in their reproduction. Simi- larly, higher notes, of a frequency of 3,000 and upwards, are apt to suffer a loss in the low-frequency amplifier following the pick-up. A corresponding rise in the pick-up baracteristic at this figure should. therefore be sought and, between

the two frequency bands mention- id; a comparatively even rise and fall within limits of half a volt 3.M.S. will constitute the reading via fairly good instrument,

The highest

Very few instruments will show a

tendency being for the characteris response beyond 6,000 cycles, the tic curve te fall away rapidly after about 5,000 cycles. note reached on a violin being of a frequency between 4,000 and 3,000 cycles the drop in the curve after this latter gure need not be con sidered a serious matter.

Perfect Reproduction. The modern process of recording by electricity, brought to light with the pick-up, ensures a faithful response over the whole range of musical frequencies on the record disc With this type of record used in conjunction with a really good mazretic pick-up it can truly be said that the only limitations to the faithful reproduction of the re corded item are the amplifier and loudspeaker following the unit.

The combination of these two accessories to the pick-up, forming

OT the complete electric

radio gramophone, and the application of pick-up to a radio net, will provide the topic of pcxt week'ą notes.

TO-DAY'S WIRELESS

PROGRAMME..

BROADCAST BY Z.B.W, ON 255 METRES.

root-mean-square voltage generated 11 to 11.30 a..-Commercial News

by the pick-up at different frequen- ries. It is quite a simple matter to read this chart, and from it 'one can determine to what extent the instrument appears to tend to the failings mentioned above,

11.20 8.m. to 12.30 p.m.--Chinese 12.30 to

orogramme.

2p.m-Programme of

Victor Records by courtesy of Messrs. Tsang Fook Piano Co. G to 6.30 p.m.-Aunty Letty, Aunty Joy, and Aunty Peggy will en- tertain the children. .8.30 to 7.30 p.m.-Programme of

Victor Records by courtesy of Messre, Tsang Fook Piano Co. 6.30 p.m.-In a Persian Market.

Reginald Foort. Organ. 6.38 p.m.-For You: John Boles,

Tenor.

It will be noted that the charaë; teristic plotted on the chart does not by any means show any sim larity to the straight line or curve usually associated with radio m strument data, ́ but instead. de- scribes a very irregular series of peaks and valleys. It should" be observed, however, that a differ- ence in volume of sound up to about 30 per cent. is barely discern-7.5 able to the average ear.

Choosing An Instrument,

6.41 p.m.-Tannhauser, Pilgrims.

Chorus. Victor Male Chorus. 6.60 p.m.-Take This Rose Maurice

Gunsky.

6.36 p.in.-Down South. Ever ready

Hour Group.

7.13

p.m.-Prelude in C Sharp Minor. Julius Schendel.

p.m.-To Thee, Oh Dearest, I Puritani. Lauri-Volpi. 7:22 p.m.-Duke of Marlborough.

Victor Male Chorua.. 7.28 p.m.-The Maiden with the

Flaxen Hair. Kreisler, 7.30 p.m.-A Talk an Art by "Mr." W. Noise,Pictures and Their Place in the Home,"

An important point to look for on the graph is a high peak, or indication of strong response, up to a frequency of two or three hun- dred. In this region are the base notes, the middle on the piano- 7:45 Approx.--Recorded programme

continued. forte being about 500 cycles. The 7.47 p.m.-Singing a Vagabond recorded amplitude of this fre- Song. The Revelers.

quency band having to be curtail-53 p.m.-Polish Dance (Shar-

wenka) Hans Barth. ed by the recorders in order to 8 p.m.-Chinese programme. accommodate them within the re- 10.30 p.m.-Close down.

BUY BRITISH & BE PROUD We have just unpacked a Shipment of ALUMINIUM BASE-BOARD & PANELS. Suitable for Short Wave Receivers and other asta that require Screening

OTHER RADIO & WIRELESS

(Gaarsatond British Mado).-

ORIENTAL COMMERCIAL & Co. LTD

__BANK_OF CANTON BUILDING.

TEL. 24405,

SCHOOL BROADCASTING.

The council decided to approach all local education authorities and training colleges, with a view to

REPORT ON A YEAR'S WORK. decuring the most effective use of school broadcasting and collecting statistics of listening schools.

The third meeting of the Central Council for School Broadcasting was held at the Savoy Hotel, Lon- don, last month under the chair- manship of Mr. H.A. L. Fisher.

The executive committee present- ed to the council a report of its work for the period May, 1929, to April, 1930, which was endorsed. The nomination of Miss Mary Davies as a member of the council in place of Mr. Wintringham was approved, and the council also te commended that the Association of Directors and Secretaries of Educa tion in England and of Directors of Education in Scotland should be invited to nominate representatives to serve on the Central Council.

Value of Broadcast Lessons,

The council recorded its apprecia- tien of the valuable work done by the subject sub-committees, which had throughout the year supervia- phlet material for the current ed detailed arrangement and pam couracs, and had collected evidence in a variety of ways both from tea-

schools. The committees had also cher members of the committees and from teachers in listening considered each subject of the cur riculum with respect to its suitabili ity for treatment by broadcasting, and had outlined the aim of cach of the proposed courses for 1930 to 1831. It was further decided to re- commend to the B.B.C. that the

the

For Better Result

TRY

MULLARD

THE BEST BRITISH MAKE

THE

British & American Bases Available

evidence collected by the History MASTER VALVE Sub-Committee regarding value of broadcast lessons in bistory should be published as a pamphlet and circulated to suitable educa- tional bodies, with the request for their considered opinion on the ex-

tent to which the value of broad- cast history lessons was demon-

strated by it.

SINCERE'S

SOLE DISTRIBUTORS

We invite Inspection

of the New Improved Type of

TELEFUNKEN 30 W

styled

TELEFUNKEN 31W

Most Suitable for Local Reception.

0.0

SIEMENS CHINA Co.,

PEDDER BUILDING, 4TH FLOOR, HONG KONG.

Also Obtainable

Mesra. WAR MEI ELECTRIC Co.

183 DIF VOUT ROTT RUNG MING ELECTRIC CO.,

167, Dza Vaux Boad ANDERSON MUSIQ. Comp. Br. Gronor's Вpalding, 27, NATHAN BOADICE HOUSE STREET,

PEKING BUILDINGS,.

TE

FUN