1931-01-01 — Page 2

HONG KONG DAILY PRESS, THURSDAY, JANUARY 1, 1931.

TADIO

FEATURES

THE GENTLE ART OF WIRING

PRACTICAL SUGGESTIONS IN SET BUILDING,

WELL SOLDERED JOINTS IMPROVE EFFICIENCY.

Tho solder, the flux and the wire must be considered. Perhaps the usp of flux had better he explained, sincs quite a few constructors try to solder without it! Flux is ro quired to dissolve the oxides pro- sent on the surface of the motal,

and to assist the solder to run freely into minute pores of the metal. These are several vory eff cient flux pastes on the market, under various proprietary names. Be sure you get a good-quality, flux since, this has a lot to do with the success of soldering..

SEVERYTHING (9.E.C.) ELECTRICAL

your guarantee

TENACIOUS COATING

KEEPS YOUR SET

AT PEAK PERFORMANCE

It's not the filament but the coating on it that

MADE IN ENGLAND Sold by all Wireless Dealers.

counts

Osram

Valve

Osram Valves

with the "TENACIOUS COATING

WRITE for "OSRAM WIRELESS GUIDE" (1929, Edition) Sent Post Free,

WIRELESS.

DEMONSTRATIONS

WILL BE GIVEN

EVERY FRIDAY

11 AM-2 PM. and 5 P.M.-7 P.M.

at Messrs. ARNHOLD & CO's BRANCH OFFICE, 61, BONHAM STRAND EAST

OF THE FAMOUS

Burndept Screen Grid

Short and Long Wave Receiving Set

The solder, which is used to bind together the wires of the set, is also available in many varieties; for radio sets the blow-pipo, solder is best. It

possesses a low melting point and has the advantage of hardening quickly after the iron is removed from the joint. A con. venient way to buy wire is in 2t. straight lengths of No. 6 gauge, square or round, tinned-copper,"

In wiring up a set a good proce. dure to follow is roughly as fol lows First place the soldering iron on a lighted gästing or in the red-hot coal of a fire. Whilst wait- ing for the iron to heat up, all the soldering tags and other points of contact art, smeared lightly with fox. Care must be taken not to use too much flux. A match is handy for applying dux to the joints. The next part of the pro- cess often bothers constructors-08 they do not know when the iron is hot enough, or rather at the right temperature. One way of judging this is to see if a small green fiame is burning round the copper-bit. O no account let the iron get red-hot. Draw the iron from its source of heat and quickly clean the copper-bit with a le, then place the copper-bit in some flux; when ́t should sizzle if it is hot enough; withdraw it and apply some solder. If it is hot enough the solder will run on to the bit and form a bright surface.

The prepared tip of the iron, should now be rubbed lightly on cach of the soldering tags or points of contact; if they are clean the solder will immediately run and form small blobs. "At this point | always wipe away any excess of Aux. It is possible-that you may: experience a little difficulty in the process of tinning, but a little, practice soon makes easy what is really a simple operation.

A. Useful Tip.

Here is a good way of straighton. ing a piece of wire: Insert one and of the wire in a vice and firmly grip. the other end with long-nosed pliers. Exert a geatle pull on the wire uhitil you feel a slight "givĒ," you will then find the wire perfectly straight,

The shaping of the various wires involves fairly accurate guessing. If possible every bend should be s right angle. Decide upon the wire you intend to contect up and fix in your mind the directions you will have to take. Select a straight length of wire and hold it above. the first point of contact; mark of the distance this wire can make ja straight line. At some point it will be necessary, to bend the wire to avoid zone component; grip. the wire with long-nosed pliers and lift it clear of the set; then holding the pliers in the right hand bend the wire against the side of the jaws with the thumb of the left hand to; make a right angle.

Replace the wire in position, de- eide which way it must bend next, again bold with pliers, and repeat the bending process. Continue until the wire has completed its run and 1.then cut of the shaped portion from. the total, leaving about na-inch-to spare:

This will allow for any. alight inaccuracy. Undband

Now place both ends of the wire in position and complete the opera- Prob Titely the mo

useful for checking the accuracy of anges, a faulty angle throws ont the whole appearance of the set. Each succeeding wire length

s

treated as explained and with n little patience the result will be n aent and efficient. get.

HAVE YOU HEARD THESE?

Here are lists of long-ware' and short wave stations which should be ploked up by anyone in Hong Kong who has a mode- rately good set muitable for re- ceiving such signals. Success in picking up these stations also depends very largely upon fav- 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 lists.

LONG-WAVE STATIONS.

Wave longth

Call Kilo (Metres) Station

Sign cycle 260 Manila K.Zİ.B. 1,183 277 Shanghai K.8.M.8. 1,0ss.. 280 Tientain O.R.C. 1.070 310 Shanghai K.R.C. 987 320 Poping C.O.P.K. 945

J.O.A.K. 345 Tokyo

870 253 Hiroshima J.O.F.K. 850 855 Hong Kong Z.B.W. 840 337 Bombay V.U.B

·BED" 380 361 Sapporo J.OLÉ. 360 Кејо J.O.D.K. 20 370 Nagoya J.O.OK 810 370.4 Calcutta V.U.C, 380 Kumamotó J.0.0/K 300 Sendai /.J.O.MK. 355 Dairen

398 Rangoon 400. Osaka 410 Canton 413 Manila

SHORT-WAVE STATIONS.

41.3

P.C.L. 38.8

Kito

| CYCLES.

509.9

790 THO

J.D.A.K. 700 V.U.R

754 J.O.B.K. 750 C.M.B. 729 K.Z.R.M,' '793

Tax (Hona Kowa)

6,201 Not regular

or Wonersp

6,000 Tues, Thurs., Bak, 9 p.in.

6,806 Bunday midnigh

7,142 Daily 0.20 p.m. & 11 p.m.

7,810 Not regular

7,780 Daily 11 p..

8,108 Tuce. Fri, 9 pm-1 am.

9,230 Not regular

0,609 Not regular

9.530 Daily

Daily 7 4.m,

9,620 Fr. 8. Sut, 3 am, & 10 nm.

STATION

CALL BIGK

67.68 00.12

66.7 50.

Dohints (Germany) Khabarovsk (Russia) Nauen Мовсон

B.A.07. A.G.J.

|A.F.K. || || | 4,434 | Mon., Wed. & Fri, 6 p.n. & 2 am.

4,090 | 0-10 p.m.

R.F.N,

$35

Rome

1 M.A.

42.

Porth

6.A.0.

Singaparo

V.S.L.A.B.

Kootwijk (Holland)

37.

Bangkok (Siam)

HS.4.PJ.

82.5

Sydney

2.B.L..

31.56

A

81.48 31.20

Schonestady

W.2X.A.F.

a

31.28 Sydne

Eindhovou (Holland) PC.J.

2.F.C.

7

21.

(Konya),

7.1.0.

26.5

Bydney

2.M.E.

27,3 25.53

Bandeng

P.L B

Choltford (England)

5.8.W.

K.1.X.E

28.85 Soheacctady

W2K.O.

12:240 Nightly 12,630 am. Wed.,

Vri, Sat.

18,68 Bandoong

P.LLG.

18.4.

Kootwijk (Holland)

P.C.L.

174

Bundoorg

P.L.F.

10.0 16.J

Bangkok

H.S.J.P.J.

Kootwijk (Holinud)

1.C.K.

16.74 Bandoong 18.6

P.LE.

Nancy (France)

W.S.X.X.

24.5 Manila

13.00 Pittsburg

ན་

0.690 Not regular

0,677 Midnight daily

10,520 Not regalar

|11,020 | Midnight-8 s.m. daily

11,761 7.80 pt. & 8 am, dally, except

Saturday and Sunday

16,102 Daily 6.10 p.m. to midnight 10,304 Daily

7 p.m

17.280 Dally 8pm to midnight.

17,761 Sundays 7 p.m. & midnight

| 18,404 | Each afternoon

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

10,351 Daily 8 aan.

21,540. Not regular

(Allowance must be made for "summer-time" in most Euro- pean countries, which is one hour ahead of true time.]

MUSIC FROM

MANY COUNTRIES by wireless with

TELEFUNKEN 40

Long range All-Electric receiver with station selector for use with batteries, or lighting maina.

with TELEFUNKEN LOUDSPEAKER ARCOPHON

For Demonstration, and further particulars apply to:

SIEMENS CHINA CO.

TELE FUN

KEN

1

Office Pedder Building, 41t Floor, Showroom-27, Nathan Road, Kowloon,

Canton Office-Shameen. Bwalow-Gebr. Roese.

The Best Values In Rău.

PREMIER

A. C. RECEIVERS

PREMIER CONCERT-A 6 Tube Screen Grid Receiver, using 3 Screen Grid Tubes. Simple operation-single dial (illuminated) tuning. Remarkably sensitive and extremely good volume from loudspeaker on both local

very long. distance reception. Elegant Table Type Cabinet

$175.00

Land

onè

PREMIERTONE—This Model comprises Screen Grid radio frequency stage, one detector and two stages of audio amplification, using Sensitive 5 tubes, including a rectifier. and distance getting. Attractive Table Type Cabinet

$125.00

PREMIER BABY-This Model is most suit. able for those who are content with local and medium distance reception. 4 tubes. Easy to operate. Excellent Volume through an Ordinary Good Loudspeaker.

$50.00

ALL BATTERYLESS AND INCORPORATE THE NEW FEATURES IN RADIO,

Ask for a Demonstration.

THE SINCERE Co., LTD

AC-SG3 Set

ENTIRELY MAINS OPERATED

A sensation in 3 valve sets, with 1 watt undistorted output; enough power for any moving coil or dynamic loudspeaker. A set that will appeal to you whether you are interested in perfect quality from the local station or clear reception from distant stations.

Price only $145.00

"Including Marda Valves (the best British Valves)

Special B ELIMINATOR for any domestic. set or made to order for any requirements.

For perfect reception

“MAZDA" Valves,

use.....

large stock newly arrived

RADIO batteries made by new process minimis- ing deterioration “PERTRIX" 150, 100, 60, 15 volts and C. batterica,

Ebonite "TROLIT" and Pressed Fibre Panels cut in any size. Loudspeakers, and various parts are also obtainable.

For further information apply.

TELEFUNKEN CANTON TRADING ASSOCIATION, L

LONGEST EXPERIENCE-LATEST DESIGN."

CHINA BUILDING (OTH FLOOR).

TELEPHONE 240