1932-02-11 — Page 2

Page

HONG KONG DAILY PRESS, THURSDAY, FEBRUARY 11, 1932.

THE SUPER-HIT THE SET OF THE FUTURE.

SLOWER "MOVEMENTS OF CONDENSER DIALS REQUIRED.

A fairly common fault with dual range coils, evan in those days, is that the long wavelength part acts to destroy the effectiveness of the

medium wave-length print overÚL portion of its range

What is happening is that the long wave-length winding, when

shorted out or left of the "cirouit, as the case may be, is tuning to a medium wavelength. This ware length is determined chiefly by the inductance of the coil, and the self capacity, to which must be added -the eircuit capacities. •

You will find when this fault it present that over a part of the medium wavelength band much more than the normal amount of reaction is needed. Sometimes, in really bad instances, the circuit cap- not be made to oscillate at all over part of the tuning range -

The fault is not too sasily re moved in made-up coils. Shorting out the long wave-length part, when this is not already affected, will often remove the trouble.

ད་

In other cases the addition of a fixed condenser scross the long wave-length part will so alter the -tuning that the trouble disappeara, With a faulty coil you get broad tuning, poor signal strength, and the tuning is difficult..

EVERYTHING

The

i

RADIO MO

Need of Selectivity.

If you were to ask your keen wireless friends what is the chiol fault with most sata, they would Bay, not enough selectivity.

H

FEATURES

pick-up are connected to the ends

of the grid leak which is joined to the detector.

4

ANESTHETIC BY

WIRELESS.

SHORT WAVE SURGERY,

Dwing, however, to the varying load of the grid circuit of the valve upon the pick-up the reproduction is usually not considered good enough The grid sircuit of the

Will surgeons thortly be able to valve passen current and the value of the current varies with the voltandig general anesthetic by

21

The fact is that most receivers have much too poor a tuning surve. Ronction helps, of course, but not to the extent often thought. Our sets, with their one or two screen- grid stages and three, or perhaps set up by the pick-up. Thus dfreating painlessly, ultra-shers

the effective long is varying all the short waves on the brain? time and distortion results

four, tuned circuite provide not enough selectivity for the magnifos tion available.

The difficulty, in part, is that the coils or made of fairly high resist ances in order to help ganging. Then again, the tuning condensor may not tune accurately over the whole range, due, perhaps, to a fault in manufacture or to wrong setting up by the usar,

Connect one side of the pick-up to the grid of the valve and the other side to the grid-bing battery thus the valve is used as an am plifier with negative bins when playing a record,

17

A bias of 1.5 volts is usually auf fient and the high tension applied

PROGRAMME.

elnimed to have perfected a new TO-DAY'S WIRELESS death ray in the form of ultra short} waves, which could be transmitted 900 mile without an aerial and by

..▷

means of ordinary, wireless valvos. Germs in bacterial cultures, it was, claimed, were killed instantly, and zien animals of small size.

Ouring a Wart..

'Baron' won Ardenne, a German Only a few days ago the Marchese scientist of 26, famous for his diss Marconi said that the ultra-short experi. coveries in connection with the waves with which he was Cathode ray escillograph, which menting might be developed into a enables the course of magnetic death-ray. storms to be traced and the position of an aeroplane in flight to be de

to the valve must be of such a valuetermined, is now experimenting in that the valve is able to work Berlin aboratory with ultra- an amplifer. In some instances the

Realising these matters, it is not difficult to understand why de signers are turning their attention normal voltage used for detection short wares and their use in medi- to the super-hoterodyne receiver. is not quite enough for amplifoncine, There is one, using six valves,tion with grid bias and this point which is as cheap to build and to

must be watched.

veo ns, a gotd-class three-valve set.

Poor Wander Plugs, Tuning is easy. Dozens of distant stations are brought in at full loud-reception are to be traced to the Many faults and cases of poor speaker strength Quality is good wander plugs. Some of those are and the construction is so easy that no shaped that a good contact with it might well be said to be more the sockets of batteries is not pos easily built than some three-valve sets. This is obviously the set of the future.

A Pick-up Point. There are several ways of con- nocting à gramophong pick-up to a set, some, of, course, being cheaper than others,

nible.

7

Others, again, havo the connect- ing, wires fastened" to them awk- wardly, so that a poor or intermit- lent contact is obtained. There are good plugs, and they cost but little more than the inferiur kinds.

New Dials.

"With the super-Heterodyne circuit Results will be ob-back in faviur again, slow-motion tained if the two wires from the dials with better and slower move-

menta will have to be brought out.

The typos, now available are per- fectly satisfactory in many respects, for standrad three and four-valve sets. But the super-heterodyne set tunes so sharply that we can do with

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better tuning, movements. When a station is in and geno in a part of a degren, something really good in tuning movements is need.. ad for the beat resulta.

It is undorstood that Baron von Ardenne has already demonstrated that he can stimulate any preţi- qular part of the brain, and can produce, if required, the same effect of insensibility as that of chloro- form or ether and oxygen,

"}

Mental "Medicine,”

The "correction of imbecility or montal weakness, it is understood, is another possibility to which the scientist is directing attention.

BROADCAST BY Z.B.W. ON

355 METRES.

11 to 11.30 am-Stock quotations:- 14.30 am-Chinese programme. 12:30 p.m.-European programme of

Columbia recorda,

1 p.m.Local time and weather

report.

1.30 p.m.-Eugby Pross nows, mail

notice, etc.

2 p.m.-Close down.

7 to

3 to 7 p.m.-Chinese programme.

10.30 p.m.-European pro- gramme of Columbia racorda

Operatio.

"Engineers tell mo" he mid,p.m.-Stock quotations, mail no-

tics, ate. "that such short waves can kill 7.03 to 7.31 p.m.-- mice and birds. I have not ex-

perimented with them as a death, ray, but if you get in their path, your whole body begins to warm up,"

UNCLAIMED TELEGRAMS.

AT THE GREAT NORTHERN TELEGRAPH Co., Lrn.

ADORISSED Abramoff Hotel Cecil! Tisnihvemo

0

Frex Bhanghai Shanghai"

F. V. JENSEN,

Superintendent.

Dr. William Beaumont, medical Beng Kong, February 10, 1932. officer in charge of St. Pancras Municipal Clinic, has stated that there may come a time when a doctor will be able to write out

prescription substituting wave lengths for drugs.

4

In 1920, Professor Esau, of Jeua,

HAVE YOU HEARD THESE?

Here are Hats of long-wave. and short-wave stations which should be picked up by anyone in Hong Kong who has à mode- rately good sat table for re- calving such signals: Success in picking up these stations also depends very largely upon fav- ourable atmospheric conditions. Beaders are invited to add to this list should they succeed in picking up any station not in cluded in either of these liste.

LONG-WAVE STATIONS.

Call Kilo

Wave length (Metres) Station Sign cycle

200 Manila

K.Z.I.B. 1,153. 277 Shanghai K.S.M.S. 1,083 245 Tokyo 3.0.A.K. 670

303 Hiroshima (J.O.F.K. 880 355 Hong Kong ZB.W. .840 357.1 Bombay V.U.B. 810 301 Sapporo J.OLK 830 368 Keljo J.O.D.K. 820 J.0.0.K. 810 V.U.O. 800.9.

370 Nagoya

"380 Kumamoto J.O.G.K. 790 770 760

370.4 Calcutta

300 Sendai

386 Dairen

400 Osaka *410 Canton 480 Manila

J.O.H.K. J.Q.A.K. J.O.B.K.

C.M.B 732 K.Z.R.M. 325

„SHORT-WAVE STATIONS.

KILO

Стсява

750

STATION

CALL SIGN

TE (Una Koxo)

*

OF WORKING

67.85 Doblatz (Germany)

A.F.K

4,434 Mon., Wed. & Fri, 6 p.m. & 2 %.m

4,090 5-10 p.m.

A.G.J.

5,291 Not regular

F.N.

6,000 Tao, Thurs., Bat, 6 p...

1.M.A.

6,800 Bunday midnight

6.A.G.

7.310 Not regular

60.19 Khabarovak (Russia) B.A.07. 58,7

Nauenw

80. Може

€3.0 Bome

馥 Perth

41.J

Singapore

88,8 Kootje (Holland)

87 Bangkok (Siam).....

| H.S.4.P.J.

85.2 Byday

2.B.L

81.66 Melbourne

3.L.0.

31-48 Saksnectady

91.30 Eindhoven (Holland) | P.CJ.

81.za | Bydney

2.FC.

21-Nairobi (Kenya)

7.1.0...

23.4 Bydney

2.M.E.

37.8 Bandoong

P.L. E

25.68 Chelmsford (England)

5.8.W.

24.5 Manila

22:45 Babsnectady

15.88 Bandoong

"The Barber of, Beville-Over: ture" (Rossini)-Percy Pitt conducting the B.B.C. Wirolese Symphony Orchestra-9106. "La Boheme-They Call Mo Mimi" (Puccini)-Doris Vane (Soprano),-0652

"Die Meistersinger Overture". (Wagner),-Bruno Walter and Symphony Orchestra,-DX80 Samson-Honour and "Arms"

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(Handel)-Norman Allin (Base) TSANG FOOK PIANO

DKISK

7.31 to 8 pm-

Octetten, "Rhapsodie No: 2" (Liszt arr. Willoughby)-J. E. Squire Celeste Octette.-9404.

Perpetuum Mobile " (Wabor AFT. Crooke).-J. H. Squire Celeste Octetto.

Valse Caprice"-J. H. Squire Celcate Octopte (Rubinstein ETT. Crooke)-9997. "Second Movement from phonie Pathetique " kowsky arr. Robertson).

" Sym- (Tachai-

. (Continued on Page 4)

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PURITY OF TONE

18.4 Kootwijk (Holland)

174 Bandong

Kootwijk (Holland)

16.6 Nanoy (France)

18.0

Bangkok

108

18.74 Bandom.g

12.98

Plumberg

"

V.8.1.A,B,

·F.C.L.

7,142 Daily 8.30 p.m. & 12 p.m.

7,730 || Daily Il pim

.

8,108 | Tuos, & Fri, 0 p.m.--1 am.

9,230 Not reguler

9,509 Not regular

W.2.1.A.F. 9,530 Daily 7 ..

9,020 TL 3 am, Sat. & am. & 10.a,m,

8.500 Not regular

9,877 Midnight daily.

10626 Not regular

| 11,020 | Midnight- nm, daily

| 11,751 | 7.80 păm, & 8 am, dally, groupt.

Baturday and Sunday K.1.I.E. 12,240 Nightly Wax.o.. 12,850 4 am. Wed., Fri, Sat. P.LG. 16,102 Daily 6.30 p.m. to midnight P.O.L 16,804 Daily 7p. P.L.F. 1,3,L.P.J. P.O.K

17.280 Dally 8p.m, to midnight

17,761 | Sundays 7 pm & midnight.

18,406 Each afternoon..

P.LE.

19,220 Daily 5,30-7 p.m.

19,861 Daily 8am..

W.8.X.K.

31,64) | Not regular

{Allowance must be made for summer-time ? „În most Euro- pean countries," which is one hour ahead of trao time.]

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