1932-02-25 — Page 2

Page

HONG KONG DAILY PRESS. THURSDAY, FEBRUARY 25, 1932..

RADIO

RISKS ATTACHED TO RADIO SETS.

خوبیر

A FEW TIPS FOR BEGINNERS.

“Is there any danges attached to | certainly not with frame acrials, the working of a sen? Is it pos sible to get shocks: is there any danger from lightning and is it quite safe to work from the électrío light?"

but possessors of outdoor wired should make a point of fitting safety spark gap, or, better still, an norialearth switch, as close to the lead-in ne possible. This may efficient protection against big lightning discharge

These, are the sort of questions not be, an that every sat owner has to ask

FEATURES

t неп

U

PROGRAMME.

BROADCAST BY Z.B.W.

355 METRES

ON

airoult is provided there is the put from the detector valve is used TO-DAY'S WIRELESS danger that, if the hands are placed to rogalate the grid-bias on the first inside the cabinet, to make some H.F. amplifier, so that, as the sign. adjustment to the circuit, a shock al strength falls off, the H.F. valve. may be felt if the condenser ter- is automatically made more mirals are touched.

sitive and vice varan. The iden This is often experienced with of compensating for fading has re- with mains units, the condensers of cently been incorporated in Ameri- which generally have a very large" can brondant rogervers, and will capacity and hold sufficient oleo no doubt and its way over here. tricity to give quite a bright aparic if directly short-circuited within & few minutes after switching off the power. No, harm will be done to

EUROPEAN CHILDREN'S

CONCERT.

11.30 am-Chinese recorded pro-

change quotations.

Piano Solos Etudies. Op.95" (Chopin) (No. 2 in F Minor- No. 1 in A Minor)-Wilhelm. Batthaus-893.

5,40 to 0.10 p.m.-Children's con-

ceut from the Stucho, 6.10 to 7p.m.--

Symphony No. From the New World" (Dvorak Op. 05) played by the Philadelphia Symphony Orchestra conducted by Leopold Stokowski.-M-1.

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

bide,, oto.

Variety.

from ordinary volume-contro! by 1 to 11.50 a.m.-Stock and ex-7.03 to 7:44 p.m.-

Finding control is distinguished

the fact that it operates solely te maintain the inpu or carrier wave, affect the degree of modulation, sc that the relative loudness of differ ent" passages in a given transmis sion is left unaltered, so long as the carrier wave is being received.

but it certainly will prevent the set the condensers by this short-circuit-nt a constant strengh. It does not from being harmed by statio dising, but the shock experienced way charges.

be considerable.

P

ARMCHAIR ACTORS.

himself when the serial is over- hauled and one tentatively wonders whether there is any danger of lightning (the lightning dringer in

This trouble can be minimised by The other "risks" in a set åre not confined only to summer time), much, more definitely under con-making sure of outting off the or when a mains eliminator is in-trol; in fact with a. carefully con-high-tension supply before the fla stalled and there is some doubtstructed set, there should be no mente are switched off. Most of the short-condensars will then have an op- as to whether there is any pompossibility of shocka DM sibility of shocks or short-circuit. cireuits. If the set works from portunity of discharging through

Despite the millions of outdoor batteries, then all sorts of trouble norials which there are in use it is bean, be obviated by the provision only infrequently one ever hears of fof a safety fuse. A fuse of this genuine case of an outdoor wire description should preferably be of being struck by lightning, and then the screw-in bulb type, for it gives generally beenuse that particular a visual indiention when it "blows" aerial was not earthed at the time and fuses of this variety are and breause there was no other ad- cheaper to buy and fit easily idense in turn with a longth of jacint metal. Direct "hits" hy standard serew type bulb acckets. lightning are possible only during

With home-made mains apper-i atus, there is a chance that a wrong ferce summer lightning storme.

connection on the earth side will! A modern broadenating station enus a short-circuit. An incorrect consumes over 10,000 gallons of connection in the unit itself is saaywator daily for valve cooling pur-

poses. Al Moorside Edge, provi

There is an atmospheric danger | which exista all the year round however, and it is quite likely to be garious during heavy rains. Rain is frequently charged with electricity, and many users of nets, having an air dielectric preset condensor in the trial lead, find that when rain is falling on the aerial anal sparks jump across the's ondenser insulation,

Static Charges.

F

Where to Place & Fuse.

Radio actors appear to be in for the flament anode paths, in this very easy time if cha B.B.C. copina. a new Continental idea. In a play valves. It does not follow that all recently transmitted from Lile, two the condensors will discharged in; of the principal parts were broad- this way, and if you want to carry cast by the actors from their own sitting-roumas. By following the out any adjustment to the set in play, with phones every member of perfect infety, you should first the cast was able to take his "cuce" having switched off the high and 1st as promptly as if all the ac

tors had been together in the studio. low tension short circhit onch con-

Box

وم

The best place for a fuse in a battery set is in the negative high-to trase, but it is not always so tension connection. A similar fuse may be fitted in a mainsdriven net and it is also advisable to provide

"A THIRSTY TRANSMITTER.

any to trace the external maina sion has been made whereby no less wiring. This potential danger is than 200,000 gallons of water can plies than with alternating current on, things can become serious an wraster with the direct current sup. be stored. When there's a drought"

broadcasting station

a fuss on the mains input side. maine. Some direct-current wiring These can be of a different psystems have the negative wire con- and it is necessary to have one fussected to earth and some have the

positive wire connected to earth. in each mains load

If these little points are watched. No that no:

then thore need never be any fear matter which wire is above earth, of radio

"risks." the receiver is adequately protected.

Both with battery and mains- driven seta there is the possibility of getting shocks if the working of the anode circuita is not property realism. If the average ärt, there

The sparks ape the resait of the charging ap of the aerial from the static potential of the rain drops. This potential builds u277 slowly until the value is so great that the current jumps the small are at least two condensers which

air gap of the serial condenser. have the full mains voltage aurONE

If anfety valve" is not provid-

ed. the insulation of the tuning

them.

If these have a value exceeding

mfd. then they will be found cap-

side of the wet may be damaged.

is believed that these static dis charges are often the cause of crack-able-if the inanlation is godd-of

It

ed aerial insulators and broken holding an appreciable amount of

lend-in tubes.

electricity

for perhaps several

The trouble is hardly ever likely minutes. Thus, if the mains sup- to occur with indoor aerials, and ply is switched off and ng "other"

4 REMEDY FOR FADING.

Fluctuations in signal strength commercial long-distance, signalling due to fading are minimised in by what is termed automatic gain control," in which the rectified, out-

OPTIMISM IN CZECHO- SLOVAKIA!

The Carcholovak radio author-. ties seem determined to please. listeners, and they have copied the ideu first tried out in Denmark. They have jus: issued a form which is to. Be filled up by radio listeners. garding the popularity of each type Questions are to be answered re of brondenst. It is not compulsory. as in Denmark.

HAVE YOU HEARD THESE?

Here are fata 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- osiving such signale. Success in pleking up these stations also depands 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- eluded in either of these lista.

LONG-WAVE STATIONS.

Wave length

Call Kilo- (Metres) Station Sigu cycle

280 Manila

K.Z.I.B. 1,183 277 Shanghai K.S.M.S. 1,083 "345 Tokyo. J.O.A.K. 870

343 Hiroshimas J.O.F.K. 356 Hong Kong Z.B.W. 848 357.1 Bombay

V.U.B... 331 Sapporo J.O.LK 880 338 Keijo

370 Nagoya

370.4 Crientta

*

850

840

J.O.D.K. 800 810

J.0.0.K. 7.0.0

380 Kumamoto JO.G.K.

gramme.

12.30 pm-European programme of Victor and H.M.V. records, 1 p.m.-Local time and weather

roport

1.30 p.m.Rugby Press news, mail

notice, etc

2 p.m.-Cose down.

5 to 8 p.m.--European programme. 3 to 3.40 p.m.-

A Concert.

Organ Sola"Faust" Waltz

(Good)-Edward O'Henry.- 1

B9373..

Song Little Brown Owf" (San

derson).—Mavis Bennett (So. prano).--B2100.

Piano Solos-Etudes, Op. 10" (Chopin (No. 1 in E Flat No. 1 in C Minor). Piano Solos-"Esudes, Op. 98:"7 (Chopin) (No. 1 in A Flat Major-No. 1 in C Minor).- Wilhelm Bachaus-6804. Song I Know. of Two "Bright

Eyez (Chatanm).

Song

Humorous Dialogue" Getting a

Motor.

Humorous Dialogue--" Gotting a Wife."-Constance Collier and Ronald-Squiro.-C1840,

Orchestral "Honohala

heart of Mine."

Orchestra Along

Shore."--Hilo Hawaiian chestra,BR250.

Sweet-

Miami OF-

Humorous Dialogus-" My Wire- Tess Set."--John Henry and

Blossom."--B2106.

Song "Just Keepin' On." Song Mighty Lak a Rose.”---

Paul Robeson (Bass)-E3109. Organ Solo Make Boliava.)* Organ Solo-"Why Do I Love You?"-Edward O'Henry.

B2902.

Vocal Trio-There's Room in my Heart. Walter Glynne, Syd ney Coltham and George Baker. ---B3201,

Song- Poace of Mind-Geno

Austin (Tenor),

7.44 to 8 p.m.-Sonata No. 12.

(Delius) played, by May Harri on and Arnold Bax, (Violin .and Pianoforte),--C1749/C1750.

Now Sleeps the Crimson Petal (Quilter).-Derek Old-8 p.m.-Eocal time and weather ro

bain (Tenor).-B2870. Organ

Dance"

port.

Solo" Spirit of the 8.03 to 10.30 p.m.-Chinese concert

(Ewing). Edward from the Studio.

10.30 p.m.--Rugby mid-day Press

O'Henry.B3430,

Song-"Wait (D'Hardelot).

John Tumer (Tenor).-B2205. Piano Solo Etudes, Op. 95"

NOWN.

10.23 pim-Clone down.

All reporda in the above European

(Chopin) (No. 10 in A Flatprogrammes are supplied by Messrs. Major No. 9 in F Minor).

S. Moutrie & Obi

New

Victor

Records

.FOR

FEBRUARY

TSANG FOOK PIANO CO.

8. Des Voeux Road, Central

(Entrance Ice House Street)

Telephone 24648:

RADIO VALUES

ATA SINCERE'S

STOCK-TAKING SALE

PILOT ALL-WAVE SUPER-HET. RECEIVERS $315

7 TUBE

ATWATER KENT 6 TUBE ..

MIDGETS $190 COMPACTS

390. Sendai

394 Daires

400 Osaka

410 Canton 460 Manila

800.9

790 J.O.H.K. 170 J.Q.A.K. 760 J.O.B.K. 750 C.M.B. 781 K.Z.R.M. 625

7 TUBE

"

$240

COMBINATION CONSOLES

$650

PILOT

$300

SHORT-WAVE STATIONS. ̈ ̈*

TIME (HONG KONG)

UNIVERSAL SUP R WASP

PREMIER CONCERT 6 TUBE RADIOS.

"

"$300

$150

RADIO RECEIVERS

Let us demonstrate to you :-

23

The MARCONIPHONE

SUPEHETEROGRAM

The Radio Gramophone

without a peer

A. C. Mains operated

The ELECTROTECH"

4 and 6 valves. Table Models.

A. C. Mains operated

with attachment for Gramophone pick-up

The “KING"

6 valves Table Models

A. C. Mains operated

with attachment for Gramophone pick-up

RUDOLF WOLFF & KEW, LIMITED

1.T FLOOR

54, Queen's Boan, Central

OF WORKING

6,434 | Mon., Wod .& Fri, 6 p.m. & 3 ́a.m 4,000 | 0-10 p..

Not regular

STATION.

CALL SIGN

67 85 Dobinte (Germany)

50.12 Khabarovsk (Eusain) 66.7 Nauenw

A.F.K. |B.A.97. A.G.J.

4,291

60/

Mosco

44.6 Roma

E.F.N. I.M.A

42.

Forth.

41.8

Singapore

0.A.G. V.S.1.A.B.

8KB

Kootwijk (Holland)

$7.

Bangkok (Slam)

P.C.L. |HSAPJ.

8,108 Tues. &

85.2 Sydney

51.65 Melbourne

8148 Sebasactady

8.1.20 Eindhoven (Holland)

Nairobi (Kanya)

2.BL. 8.1.0.

5,000 Tue, Thurn, Sat...,-8 pm. 6,896 Bunday midnight

7,142 Daily 8.80p.m. & 11 pm.

7,810 Not regular

7,780 Dally 11 p.m.

Fri, pam 0,250 Not regular 9,609 Not regular

W.2.X.A.F. 9,580 Daily 7 a.m.

..

9,020 Fri, 3 a., Sat. 9 am; & 30 a.m.

9,000 Not regular

3,877 Midnight daily

PC.J.

11.28 Sydney

2.1.C.

B1.

98.5

Sydney

Lo

J

2.M.E.

27.8 Bandoong

10,528 Not regalar

P.LE.

26.58 Chelmsford (England) 6.8,W.

H.8.1. P.J.

11,020 Midnight-8 am, dally

11,751 7:30pm. & a.m. dafly, orcept

Saturday and Sunday

12,240 Nightly

13,850. Wed., Fri, Sat.

18,302 | Daily 8.30pm, to midnight 10,304 Dally 7 p.m. 4

17280 Dally 8 pm, to midnight 17,781 Bunday 7 pm & midnight

246

Manila 22.38 Babonectady

K.1.X.B.

W.2.X.O.

18,88 Bandoong

P.LO

19.4

17.4

Kootwijk (Holland)'P.C.L. Bandoong

| PLAN.

10,0 Bangkok

10.8

Kootwijk (Holland)

F.C.K.

16.74 Bandoeng

P.LE,

15,6 | Nangy (France)

19,351 Day, 8

13,00 Pittsburg

W.8.X.K.

TIL. 22187

18,404 Ennis afternoon.

18,220 Dally .30-7 p.m.

21,540 Not regular.

[Allowance must be made for. " summer-time" in most Euro- pean countries, which 'la one hour aboad of true time)

All above radio sets are for A.C., prices including tubes and, except the last 2 items,. loudspeakers.

Various kinds of Loudspeakers at prices over 30% lower, ranging from $5.50 to $35 nett

ATTENTION !!!!

Our Stock-taking will be held on February 29th, and there are only 4 DAYS LEFT in which all our stocks are to be reduced for that annual event.

THE SINCERE COMPANY, LTD.