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THE CHINA MAIL,
RADIO TOPICS
BROADCASTING.
BRITISH OR AMERICAN METHODS.
on
RECEIVING SETS.
GREAT VARIETY IN USE.
A TALK ON WAVES.
SOME HINTS FOR THE BEGINNER.
The beginner is earnestly quested to exhibit no impatience. We can quite understand the enthu siasm of those who, having em. braced radio as their hobby, want to learn a lot in a little time. But we must urge them to proceed slowly, because articles of this character are to be of any use they must be comprehensive and SQ couched that everything is under stood as it is dealt with.
In our previous article we said something about wireless There le yet more to say ere we can pass to other subjects. We feel certain that if every wireless the functioning of the aerial which structor thoroughly appreciated
receives he would get far better re- ception than he usually does. There would not be any extensive serials, for instance, nor would dis- tant stations be expected poor Indoor aerials constitute the only antenna system it may be pos
waves.
con.
Probably no country has the variety of receivers that we have in Australia; variety, that is, in the sources of supply. In addition to many very excellent. Australian made acts, there is a wide choice available of imported sets and com- ponents. It looks as if the Ameri- can imports exceed those of all other countries, both In complete sets and component parts-Europe has been about 18 to 24 months behind America in the development and production of wireless receivers until recently. Now there are signa of Europe catching up in progress, Not all of the European countries show that progressive tendency, of course. The countries where radiosible to arrange.
We have shown how energy · or seams to have won the public popu-waves sent out from an aerial larity most widely are Great Bri-radiato throughout the ether. tain, Germany
Ignoring the term "energy" for the and Russia, Strangely enough, France is not as lar designation "wave" when
moment, we will use the more faml-
well to the fore as might be ex-the receiving aerial deals
deavouring to demonstrate how with pected.
radio-frequency oscillations.
when
A question that will soon come. up for answer is that of the type of broadcasting most suitable for Australia-whather we are to have service per one station and one capital city, or a multiplicity of services. In England to-day the former class of service is provided, while in America and, in a modified degree, in Austraila the latter eb tains. The recent Royal Commis- wireless heard various opinions on the subject, and quite probably will have something to any on it in their reports report, by the way, which appears to be over- due for public scouting. Many wit- nessen strongly supported the idea of multiple services as at present in Sydney and Melbourne-but just as many wanted only one service per city (writes "Ray Dio," of SLO). The arguments in favour of the one service crystallise into the capacity of one company to provide a beter service if it gets all the revenue than could be given by two companies who share the revenue.
Let us suppose that a single wave Secondly, the proponents of this so much radio material is import-does 80, and as its crest arrives,
Some may deplore the fact that
atrikes a receiving aerial. As it single station idea contend that in ed. They would like to see manu- there is an oscillation on the part of terference would be reduced, if not factures grow in Australia to such the aerial as the wave makes its eliminated for crystal listenera,
an extent that foreign sets would way to earth. When the trough Perhaps the strongest argument in
be unnecessary. However admir- which exists between the crests of favour of it is that pertaining to able a policy it is to encourage a
two waves arrives, the current pass- the service to be given. by relay
new secondary Industry--and of ing from aerial to earth reverses its stations in the country districts.
course it is admirable and desirable direction and passes from earth to It would be more economical to re-
-the progress
aerial, of broadcasting lay and rebroadcast one service than should not suffer thereby.
High-Frequency Currents. It is two services simultaneously. The
As hundreds of thousands of stated by some proponents of that oscillations are
this occurring, objectors to this scheme contend policy that a practically prohibition backwards and forwards movement that the English system, which pro tariff should be placed on foreign is taking place at very high fre- vides for only one station for Lan-sets, so as to allow the local indus-quency.
fact, the currents dealt don, is not suitable for Austràlia.
with are high-frequency or H.F. try to be developed. They say that such a monopoly is
ba. currents, rushing to and fro not desirable, and that listeners
tween the wire that forms the aerial
That policy might be curried top far; the general public may not
en-
Bhould have the facility of chang- have the facilities now available of/#nd the connection to actual earth.j
sistance.
the
TUESDAY, NOVEMBER 15, 1927.
DAILY CROSS-WORD PUZZLE.
(This cross-word puzzle has been made by an expert but our readers are warned to look out for occasional ukonstio shallinan, much as härbor mlom, and nitho,)
110
16
[?
23
40
46
24
عالم
18
is
(28
2
13t
132
23
52
**** 54 $5
$57
58
50
HORIZONTAL
HORIZONTAL (Cont.) 1-Cozy
|49-Putled -What is the Alpina 50-Watery
wild goat called? |61-A fabric with glossy
-Precious stone.
surface (pl.)
-9-Which is the largest|68-Anger
continent?
11-A native of Arabia
13-A food fish
16-Hon-fruit
18-A shrub whose
64-What is the Arat
dinner course? 50-Lifelong
68-Uncooupled
59-Affright
leaves are used for 80-Otherwias
tanning (pl.)
21-Fish eggs
23-The skin of frult
25-A Scripture proper
name
28-A moment 27-What Norwegian composer wrote *Peer Gynt Suits1" 29-A knight's titia 30-Domesticated 31-The act of making
null, as a judgment 34-The Greek latter D 36-Rown
87-Empire in N. E.
Africa 40-Great lake in E.
Africa
}
42-Suffix. Resembling 48-To long for 48-Ons of the Great
Lakes
47-A gnat
[61-A drink of optriia
VERTICAL
2-And not
.
સમ
45
VERTICAL (Cont.) 20-What is a charge for
firearm oncioned
· In a casa called?
22-A prophetlo algn 24-To dle
26-What, te a'larga a drinking-oup?
|28-What Roman
emperor was killed by his soldiers in 69, A. D?
120-Bracing
I
22-9mail boll on the
ayalld
$5-duffix, same as "an”
3-Poison tres of Java|30–What was the 4-A French colony la
W. Africa
ancient post's harp onlind?
B-A watering place in 18-What are the intera)
Upper Austrla 6-Cut slantingly 7-A sense organ 10-Iceberg
parts of an object↑ 19-Always 30-What is fresh
11-Who was the sun-
god of the anplant Aryama?
12-Plural of labium, a
Up
}14-8tiffy proper and
Information con- earning recent · events? 41-8mall lelandə in
Inland watere
|44-Barren and dry
45-Large pitcher 47-What northern trus
produos sigar?
about
51-8oapy water. |19-What noted Indian 162-To dry up
chief of Mazsxahus-15-To lubricats etta died in 1881† 167-A constellation
nent 15-Anything done 17-To bind around or 148-Concluded
The solution of the onove cross-word puzzle will appear in to-morrow's issue awng with a new cross-word puzzle.)
YESTERDAY'S SOLUTION.
EWES DAUB
EASI VIED
CER
ABO MAP
SELAH
ED
ing from one local station to an-
If there is a clear passage be- making a selection from a wide tween aerial and earth, this back- other for alternative programmes.. range of designs from different wards and forwards-movement can Are Class "B" Stations Necessary.
But the multiplicity of class "Bcountries. It is desirable to allow cecur easily. If there is any re stations is the point I had in mind listeners and home constructors to sistance or obstruction in in writing. We are told that satis- keep up with the advance of radio aerial-carth system, the efficiency of factory reception in Sydney is par-pounds can be spent on research that we so frequently advise a good in countries where millions of the system is impaired. Our read- ers will now understand how it fa ticularly difficult owing to the num
and development. That could be ber of "B" class stations. Now
done, and the same reasonable faci and they will understand, too, why aerial to aerial terminal, and his earth no less than a good aerial, these stations may be regarded as litles be given to Australian manu-we frequently suggest a thick earth earth to earth terminal, he is ac- When the operator connects his
providing sectional services-for
facturers. commercial, political, or religious
lead which has a natural low re-tually passing his aerial through publicity. The Government autho-
British Policy.
The receiving aerial is subject, bis set. Oscillations that occur rities apparently do not restrict the
Britain started off in 1922 by as we have shown, to very rapid when a wave strikes his aerial have number of such stations, and it is blocking the importation of sete alternations or reversals of current, way to earth, and pass through the to pass through the bet on their conceivable that some embarrass- for two years, and it is doubtful of and these alternations must syn- ment will be experienced in draw the policy. was a wise one for the chronise with the alternations that set again as they reverse their direction. These high-frequency; ing the line. One section will be public generally. Since that bar- occur the transmitting aerial be able to justify a claim for the rier was removed, the British manu-fore the station concerned can be oscillatione, as they are termed, are brought into and through the re- privilege of a licence if its rival or facturers found
that they could regarded as tuned.
It is here that we can explain the ceiving gear, where they can be ganisation has been granted such a give more attention to the manu- meaning of waves more clearly. In dealt with as may be required. privilege, and the result would un- facture of sets for export as well the case of a long wave, the crest they pass through the aerial coil- And as they pass through the set, doubtedly be objectionable from the as for local use, but the British of one is further away from the or the inductance, as it is often point of view of the listener. He export trade in radio is being chal-erest of another than would be the termed. It is by manipulating the in- pays for a service to be given by lenged severely, by Germany; it al-case if the waves were short. Thus ductance that the wavelength of the two "A" class stations. And the ways way,-of-course, by America.
the aerial reverses its current more aerial can be altered till it is exact- companies or the Government which The export figures for 1925 and slowly because it takes longer for ly the same as the wavelength of We now have to employ other demand the payment of a subscrip- 1926 show a steady advance by Ger- the cresta and hollows or troughs to the transmitter.
means wherewith we can further tion in the form of a licence have many, and a decline both by Britain quency, therefore, is less.
succeed one another. The fre
alter the aerial's wavelength to u an obligation to the listener in ad- and America. Americans exported
Varying the Inductance.
nicety. It must now be altered so dition to that of providing à ser- £2,042,000 worth of radio gooda in rapidly crest and hollow succeed a part of the aerial, as we have away from each other
The inductance, or aerial coll, is precisely that stations, ten. metres vice. That obligation is to keep the 1926, while in 1926 it decreased to each other at greater speed; the shown. By making this coil larger separated.
can be To do this we use a ether reasonably free for the unin- £1,813,000. Great Britain's figures aerial-earth currents, reverse more or
smaller, the aerial's wave- variable condenser, which is shunt- terrupted reception of the paid ser- for the same years were £1,280,000 rapidly. The frequency is then length. is made higher or ed across the aerial coll. vices. Any great increase in the in 1925, and £1,266,000 in 1926. said to be greater,
lower. When our popular ""46" And when a station is tuned in number of stations operating at the Germany, on the other hand, show-ceive a long wave, it throbs, or os nerial is of nominal length, the cur in the receiving system are in When the aerial is tuned to re- coil is plugged in, and when the the oscillations or waves that oc- same time makes the chances of ed an increase as follows: 1925, ex- cillates, in sympathy with the aerial is about the wavelength of exact sympathy with similar nacil- uninterrupted reception by average ports amounted to £1,478,000; 1926 aerial of the station transmitting stations operating between 300 and lations that occur in the transmit- sets more and more difficult. The the figures were £1,581,000.
it. Waves sent out from other ata- 450 metres. When this coil is re-ting systems. proposal by the State Government
The electrical and It looks as if Germany is mak-tions, and of different length, Bre moved and a "150" put in its place, unseen link between transmitter in Sydney to add more stations, ap- ing a determined bid for the ex- not tuned; consequently, the act the wavelength of the serial is at and receiver is complete. Radio parently for sectional purposes port trade. There are not many does, or should, ignore them. This once raised to over 1000 metres. The communication is nearly establish- departmental correspondence or for German seta 80 far being tuned is how station separation, or elimin- aerial may be used to tune in a wide ed. What needs to be done further the dissemination of propaganda into 310, Melbourne, but apparent-ation, is brought about.
variety of wavelengths, but this before signals can be received will is therefore to be deplored. At allly the sets are being manufactur- Now the way in which an aerial sort of thing is useless for we only be the subject of further articles. events, it should be very carefully ed in quantity, and sent to other can be tuned to throb or oscillate so
want one wavelength at a time. "Glasgow Weekly Herald." investigated. In Melbourne we are countries. We can safely rely on as to be in sympathy with the more fortunate in regard to the Australian traders to see to it that transmitting aerial is to alter its number of stations, and the recep- German sets, if they do come in, tion of 3LO is not subjected to the are of efficient design and econo- same degree of possible interfer-mical price."The Queenslander." ence that may obtain in Sydney. There are "B" class stations and other wireless stations "on the air"
at the same time, but probably not ~ as many as in Sydney. It looks as
WHEN DREADED CROUP COMES.
Short waves succeed each other
Altering Aerial Length.
length. A short aerial will tune easily to a short wave, whilst a long serial will tune more easily to a long wave. But as it would be im-] possible to employ a different aerial. for every different wavelength,; other means have to be adopted to shorten or lengthen the aerial used, as may be required.
A thing of dread, that comes in the if the scheme of sectional broad- night without warning. Just a boarse, The operator could, in theory, casting is not desirable if the prim-metallic cough, a choking, gasping for climb up his poles and adjust the Bry services those for which the breath, a threat of suffocation: Ohl length of his wire until it exactly the relief of knowing that there is a listener pays are interfered with, bottle of Chamberlain's Cough Remedy suited the waye being received, or and that the scheme of two alterna- in the house. See how it clears away desired. In practice, however, this tive services is desirable. The the choking phlegm, stops the hoarse method would be highly inconven- Queneslander."
rough, and brings rest and sleep to lent, especially on a winter's night. the little sufferer., Sold everywhere. Nor is it necessary.
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STANLEY GIBBONS, LTD. POSTAGE STAMP CATALOGUES
FOR
1928.
GRACA & CO.
No. 10, Wyndham Street.
P. O. Box No. 620 Hong Kong.
GO ON-LAUGH- YOUR WIFE MADE ME DRESS
UP ̧LIKE THIS-1 WISH 1 WUZ BACK HOME!
HA-HA'
(I'M GITTIN TIRED OF
BEIN' YOUR SECRETARY, WEARIN' THESE FALSE
WHISKERS AN' DRESSIN”
DIFFERENT IN EVERY COUNTRY VENTER!
JIGGS-
COME
HERE!"
TEN
MINUTES
LATER
HA-HA!
AW-SHUT,
UPL
1927 av Int Feature
ervice, Inc. ^ Gring
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