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HONG KONG DAILY PRESS, THURSDAY, DECEMBER 10, 1931.
TADIO
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COMPACT MODEL 82
7-tube Super-heterodyne." Variable-mu tubes and pentode. For 110 volt and 220 volt A.C. current.
COMPLETE WITH TUBES, LOUDSPEAKER
AND CABINET
$240
COMPACT MODEL 80
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$225
TAKE THE ADVANTAGE RIGHT NOW!
FEATURES
A VISIT TO BERLIN. A FEW WIRELESS
WHAT GERMAN LISTENERS-
IN LISTEN TO.
QUESTIONS.
WHY ARE SHORT-WAVES
USED FOR DISTANCE?
معينة
I did not take a portable set with me when I was called away on busi ness to Berlin, 'writer X in Jualear
Frequently questions are asked on Wireless, breuse I had heard that short-wave subjects. It is interest the Customs oficials on the Germaning,to review them accasionally, and side are rather, too attentive to such things.
particulely to note that those that appar most obvious are usually those that are most difficult to an- swer satisfactorily.
*
Probably the answers to many of them will prove of interest to short- wave enthusiasts who must often. have asked themselves similar ques- tins. Even if they have only reach the stage of I wonder why and left it at that, they prob- ably are still interested. "
However, on what was really my Brat night in the German capital-a Saturday I had first-hand experi- ence of reception conditions. The friend with whom I was staying in himself an enthusiastic owner of a fernempfänger (portable set), and lato in the evening when my luged gage had been unpacked, he sug gested that we could go along to a local wireless store, where his set was being fitted out with a new high-tension battery, and should' then go back to the flat nad try to pick up some B.B.C. stations.
Portable Radio ! ·
The portable set weighed about the same as the "average British example-it weighed some twenty-1 four pounds at a rough guess-and wo book a laxi. So I had at the same time my Brat experience of Berlin traffic and Berlin wireless; we worked or tried to work-the set while the taxi was going.
Neither experience was very pleasant Traffic arrangements in Berlin are chaotic in comparison with those in London, But despite the hooting of other taxis (it was
The Question of Distance,
distance across the earth's surfaco Between, their source, and the point where they come down,
This laver is supposed to vary in height according to the position of chemin, and this ingenious theory, of course, accounts for thei
}}
different distances covered by a HAVE YOU HEARD THESE? given, signal during different de- gees of daylight.
It is well-known fact that the wave-lengths up to about 30 metres generally travel further during day. light, whereas those above will; in certain conditions, make better
night waves"
Those Erratic Conditions,
"What can account for the erratic changes in receiving conditions from week to week on the short
wages?"
||
This is another poser; if we ao. cops the Heavisidė ",, theory it partly supplies us with a answer. The following are selected as Changes in the condition of the fairly good examples of the "ob-san's surface, due to sun-spot aveas, vious" variety:
would mean corresponding changes
"Why are the short waves so in the ionising affect of the sun on 'mhick astociated with distant rethe hypothetical "layer.” reption, and why is local reception
pour "*
This is a question that it is almost impossible to answer with any certainty. The favoured theory at the moment is that of the Heaviside" layer, a region of inhised particles believed to, exist at in distance above the earth's sur- face varying between 60 and 200
miles.
Therefore, the skip-distance,"
Here are lists of long wave and short-wave blations which akould be picked up by anyone in Hong Kong who has a mode” rately good sat suitable for re- osiving such signals: Buocsia în picking up these stations also depands very largely upon fav. ourable atmospheris sonditions, Header" are invited to add to this list should, they succeed in picking up any station not f siuded in either of these lists.
STATION
Wave length
LONG-WAVE STATIONS.
Call Kilo.
(Motres) Station
"Sign oyale
KZ.I.B. 1,153
F.8.M.S. 3,083 J.O.A.K. 870
880
900 Manila 277. Shanghai. 345 Tokyo 353 Hiroshima. J.O.F.K. 355 Hong Kong Z.B.W. 846 357.1 Bombay 331 Sapporo 300 Kaijo 370 Nagoya 370.4 Calcutta
Y.U.B. 840
J.O.LK 480
J.O.D.E. 80”.
JO.UK. 610 V.U.O 800.0 380 Kumamoto J.O.G.X, 790 J.O.H.X. ***TO J.Q.A.K. 760
300 Bendi
395 Dairen
400 Osaka
410 Canton
490 Manila
SHORT-WAVE STATIONS.
CALL STON
87.88 Dobinti (Germany) A.F.K. 60.12 Khabarovsk (Russia) [BAS?, 56.7. Neusow
Mosco
as it is called, of a given signal, would vary in an erratic manner. Thus it might happen that in January a signal from America would be strong inaudible in," say," changé in'"skip" might take place that would lead to the same signul being much weaker or even innud ible in Britain in February, while in Poland it would quite possibly
50. Britain and Poland. A
Siguals radiated from an aerial travel upwards until they encounter bo strong. *. this layer, when they are partly re-
To comperante for this, the about theatre tine) and fieresected and partly absorbed, accord-chango would probably shift things application of the brakes, we trieding to their wave-length. (This is round so that another signal, not
to pick up Witzleben.
1
All we could heny, was the crackle of the taxi's magneto. We were held up in the traffic block for quite five minutes by a Schupo (the equivalent of a point duty police- man) who was interested to see what] we were doing with that mysterious looking box on the back seat of the
taxi !
But when we did get back to the fiat my German friend gave me an opportunity of seeing what sort of alternatives are to be had by the
average set-user in Berlin.
41
all in theory, of course.)
The shorter the wave-length, the greater is the degree of reflection, and consequently the greater the
(Continued on, nest Column.)
quality on a foreign transmission in a foreign language, but the general impression I had was that the general standard of tone is Perhaps not quite so good as that prelated by Britich listeners.
beard in January, would suddenly start arriving in February.
It seems probable that what we call bad conditions," when we can hear no distant stations at all, are nply periods that should be good for the reception of parts where no transmitting stations exist. After all, the Preise Decan alone secounts for a large part of the globe and ja not very thickly populated by aut wave transmitters!
י
"Why can there be several tran tiply there is no attempt to mitters, working in a space of a few. produce a boomy" bass. Two metres faug, between 30 and 32) speakers which I heard working on when, on the broadcast waren, sta-| We specialised in Mühlacker,dinary three-valve mains-driven tious five metres apart interfere Witzleben, and Königswusterhausets were rather reedy "in tone. #CD. Of course, it was impossible
to hear the London Regional as î programme of Mühlacker drowned
it completely. The heterodyne could be heard. The two French stations,
rectifiers.
Mains-driven Sets.
with each other.”
This is simply because it is ridiculous to keep to
"wave-
I should say that the average set lengths," when frequencies" are in Berlin is mains-driven, and all more scientific and less mislending. the mains sets. I saw had valve Frequencies are inversely proper- one of which we did not stop to identify, and another which by its
There was one mains-tional to wave-lengths, and a ata- wavelength was obviously Radio driven two-valve set which, com- tion always occupies the same fre- Paris, came in well, as did the lete with its valve rectifier, was queney-band, except when come London National and Midland Retained in a box measuring only thing is technically wrong and it
13 in. by 5 in. by 5 is. gional.
"spreads," Frequencies are ob- On the morning. after my arrival tained by dividing wave-lengths (in reception log I was asked to trytinental, Sunday programme at first then being in thousands of cycles, I was able to hear a typical con- I metres) into 300,000, the answer
When we had made out this rough
hand.
the dials and examine the set." The
I saw, on reference to the er kilocycles. 300 metres is equiva- sot, by the way, was of a well-known Gerany make, and one or two of programme in a newspaper, that lent to 1,000 kilocycles per second, Wittehen bad broadenst gymnastics and 3,000 metres to foo Koeyeles the components which were cm- bodied I recognised, as having "Been
at 8 o'clock in the morning and per second. in London radio-shop windows. It that weather forecasts and the bulletins had been was a four-valver with two high-ngriculture
Simple Arithmetic.
frequency stages and a pentode, broadcast before breakfast. At odd
Thus a little simple arithmetic but the performanco certainly was interval during the day I listened will show that between 30 and 33 pot, up to what the average British
to an outside breadth of the un-
metres we have nearly 1,000 ke amatour would expect from a se
whereas between 300 and 333 metres of this description, made up with veiling of a memorial to
Schoneberg
we have only just under 108 ke British parts. Although it was not ababitants who fell in the Great And this, with 8 metres in the one light in weight it was exceptionally War, a programme of light music case and 83 metres in the other! compact and there was plenty of from Koenigsberg, a variety pro- The fresheney-band contained be metal screening. The endeavour to-
tween 20 metres and 30 metres in wards compactness had been carried Bramme, and an orchestral concert.
about five times as wide as the whole to extrumes and the coils did not impress one as being very efficient.
Later on in the week my friend bad again occasion to call at
THE SINCERE CO., LTD. wires shop and whils waiting. I
SOLE AGENTS.
It seemed that the whole day was range between 300 metres and the adequately provided for by broad-"top edge", about 30,000: feasts of one kind and another, but metres i
then one must remember that the
Thus we are able to be confused by thinking in metres, whereas by
heard one or two other German continental conception of Sunday thinking in kilocycles we can tell commercial table-type sets
ets working is very different from that held It is extremely difficult to judge by, say, the B.B.C. and Z.B.W.
at a glance what chance there is, of interference between two stations.
17.
31.45 Bohenectady
$1.20 Eindhoven (Holland) [P.C.J.
R.F.N..
43.6 42. 41.3
Bame
IMA
Parth
i
6.A.G.
Singapore...
V.S.I.A.B..
38.8
Kootwijk (Holinad) POL Bangkok (Siam).
184PJ.
32.
Sydney
2.2.L.
32.66
Melbourne
BLO
W.2.X.A.F.
1.8 Sydney
2F.C.
31.
Nairobi (Kenya):
$7.1.0.
98.5
Sydney
2.M.E.
27.8
Bandoang"
P.LB
16.63
Chelmsford (England)};6.6,W..
24.6 Manl
K.I.X.E
28.06 Behanectady
W.2x0.
18.88 Bandoeng,
18.4 17.4.
Kootwijk (Holland)
F.CL
Bandoeng
P.L.F.
16.0
Bangkok
E.9.1, P.J.
16,1
Kootwijk (Holland)
P.C.K
16.74
Bandoung
18.5 13.03
Nancy (France)
Pittsburg
P.L.G.
R.LE.
W.8.KK.
Kuto
J.Ó.B.K. TKO
C.M.B. E.Z.R.M.
Ts (Hone Kora) OF WORKING
625.
4,494 Mon., Wed, & Tr., 0 p.m. & 2 mm 4,990:1:6-10 p.m
B01 Not regular
6,000 Tue, Thurs., Sat., 8p.m.
5,820 Sunday midnight
7,142 Daily 0:30 pm. & 11 p.n. 7.810 Not regular
7.780 Daily p.m.
8.108 Tuss, & Fri, 9p.m.-1a.m.
9,280 Not regular
9.603 Not regular
9,580 Daily ..
ار
9,620 Fri, 8 m., Sat. 3 am, & 10 am..
9,800 Not regulks
9,677 Midnight daily
10,628 Not regular
11,020 Midnight-3 am. daily.
11,751.7,30 p.m. & 3 am, daily, except
12,240 Nightly
Saturday and Sunday
13,8604a.m. Wed, Fri., Sat.
10.102 Daily (130 p.m. to midnight 18,304 Daily 7 p.m.
17.250 Daily 8.5.
midnight
17.751 Sundays 7 pm & midnight 13,404 Each afternoon.
19,220 Daily 80-7 p.m.
10,851 Daily 3
21,640 Not regular
1
[Allowance must be made for "summer-time" in most Euro-
paan countries, which is, one hour ahead of true tims.]
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