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THE CHINA MAIL,
RADIO TOPICS
WIRELESS UP-TO-DATE.
DISTORTION IN AMPLIFIERS.
WIRELESS FORECASTS.
WEATHER ON AIR ROUTES.
MISCHIEF OF WIRELESS.
"PEOPLE KEPT AT HOME" NOWADAYS.
One
A good deal of attention has been Among the varied activities of
The mischief resulting from the given to the problem of selectivity, the Meteorological section of the present popularity of wireless was as experience indicates that the Air Ministry those concerned with that which kept people at home, simpler type of wireless receiver in aviation in particular are steadily, Anid the new Master of the Mual- many instances fails to provide ade- growing. Recording in their re- cians' Company (Dr. G. J. Bennett),, quate tuning (wrica W. James, the port for 1926-27, n.considerable "Morning Post" Wireless Corres- growth in all brauche of this in presiding at its annual dinner at
Stationers' Hall in London. pondent). Many receivers enable work, the Meteorological Commit- effect of keeping people at home one to hear a distant station but fall tee state that increased advantage was that many of the musical so to eliminate the local station, with has been taken by both Service and cietica were in danger of being the result that the two programmes civil pilota of the facility by which snuffed out altogether. Their com- are heard at the same time.
a weather r port or forecast for We have described how the tun-any route or area in the British any was the oldest organisation in the country devoted to music, and ing can be improved by using a
Isles or along the main Continental embraced most of our distinguished good tuning coil with the aerial routes can be obtained on request, musicians, amateur as well as pro- connected to a point on the coll, and at any time during the day or night, fessional. how, for really good results, two from the Aviation Forecast Service. well made tuned circuits are neces. During one month 226 such sary. Having arranged for adequests were received. There has quate selectivity we have now to also been a marked increase in the consider how heat to amplify with number of inquiries for forecasts out distorting by more than a cer- received at distributive stations on tain amount, and secondly to obtain acrodronies, the volume of sound necessary for pleasant reception with a minimum of trouble and expense.
a re-
re-
During the year investigations of meteorological conditions were car- ried out in respect of the following Not Expensive,
projected air routes: (1) Khartoum To have practically perfect re- Kisumu, (2) Calcutta-Rangoon, (3) production fa not necessarily expen- the West Indies and the northern sive unless very strong signals are,
coast of South America, (4) Cairo- required, and in this connection we Karachi (special data), (5) Bristol have to distinguish between
Berehaven. Considerable time was ceiver which an engineer with his devoted to the organisation of the laboratory equipment saya is nearly meteorological arrangements along perfect, and that which the critical the Cairo-Karachi air route, the listener describes as quite satisfac-first section of which-from Cairo: tory. For the engineer makes mea- surements and draws curves. to show the performance of a set, and is apt to class as unsatisfactory that which the average listener finds quite acceptable.
re-
After the loyal toasts, the chair. man desired the members. and guests to indicate their sympathy with the Royal family on the cent death of the Marquis of Cam bridge, and the company reaponded by rising and standing for some moments in silence.
Dr. Bennett opened the proceed- ings by presenting the three silver medals annually awarded by the Company to Bandmaster W. North- cote Davis, Royal Naval Bund, Royal Naval School of Music; G. W. Hespe, A.R.C.M., 1st Bat talion, the Queen's Royal Regiment (West Surrey), and Royal Military School of Music; and Mr. Edgar Kendal Taylor, R.C.M..
The
to Basra was opened in January. Blackie, speaking as Precentor of Venerable Archdeacon Personnel of the operating com- pany who are to act as meteoro- Lincoln, in proposing the "Wor- logical observers at auxiliary re-shipful Company of Musicians," porting stations in Palestine and said he often wished they could along the Persian Gulf have been enforce
prohibition
mistake of judging quality of re-ments have been made for the production by the performance supply of the necessary instru- curves of individual pieces of ap-mental equipment for these sta- paratus rather than by using these *ions. curves as a guide, and judging a set's performance by ear.
the old
Christ ans
of
time.
Many amateurs, too, make the trained at Croydon, and arrange forming outside the houses
against wandering musicians për- nobles and persons of importance,
at especially (Laughter.) He described the suc cess with which their chairman had! served in the office of Sheriff of Lincoln, and especially as a public speaker, even at bazaars and sales of work. (Laughter).
The year has seen considerable advance in the plans for the pro- For a long time, it has been said vision of the necessary ground that the use of resistance couplings meteorological organisation for the in a low frequency amplifier would home trial flights of the two new onaure faithful reproduction. But airships of 5,000,000 cubic feet this is not true. Resistance- capacity, and for their trial flights coupled amplifiers can, and very to India. Very close liaison is be- often do, distort very badly according maintained with the sirship ing to the design of the couplings. I staff in all meteorological matters It is only comparatively recently affecting airships, and interim re- that the ordinary type of resistance ports are being made as the investi- coupled amplifier has been proved gational work progresses, to enable to fail adequately to deal with the the earliest possible use to be made higher audio frequencies.
Parti- of the result. .: cularly is this true when the In regard to wireless weather' re- couplings include resistances of high value; yet the amplification given increases with the value of these resistancea.
Co-
ports, it is mentioned that in the twelve months under review 4,714 reports were received from the thirty-two North Atlantic liners. For these reasons it is doubtful The number of British observing whether such an amplifier best ships regularly making weather re- meets the requirements of the ports to "all ships" along all the average listener. Such an ampli-trade routes of the world has more fier, however, is relatively inexpen- than doubled, and is steadily grow- sive, does not readily get out of ing., "The practical application of order and consumes but little cur- the work at sea is steadily being rent. Its great advantage is the organised with the voluntary case with which the very low notes operation of marine observers, and can be magnified. ...
the support of many of the marine Transformers, on the other hand, superintendents of the great steam- tend to cut off the lower fre ship lines, with a view not only to quencies, but in many instances aiding navigation, but ultimately to they amplify the higher frequencies aid aerial navigation overseas; and very well. A good transformer therefore too much encouragement used with the right valve will cannot be given to the captains, amplify frequencies from about 50 officers, and wireless operators of cycles to 6,000; above and below regular observing ships. In home this range of frequencies the trans-waters evidence of the value to former cuts off, which is probably shipping of the British Weather u desirable feature.
Shipping Bulletin has continued to It is true that many loudspeakers come in, and during the year the do not reproduce the very low and appreciation of salvors was especi- high notes as they do those of ally evident."
middle frequency: many people therefore question the necessity for a nearly perfect amplifier. But
a good amplifier is no more expon-into the low frequency amplifier. sive than an inferior one, and the This condenser has the effect of more realistic reproduction which is reducing the strength of the higher obtained is ample compensation for audible frequencies and, unless the time and trouble spent in precautions are taken which have choosing the right parts and valves. the effect of reducing the overall When considering the perform amplification, the anode bend detec ance of an amplifier it is necessary tor will distort more than that to remember the detector. Two which uses a grid condenser and methods of detection are commonly leak.
Power Valves.
sed. In one a grid condenser and leak are employed, while the other uses a grid bios battery.
A very good low-frequency The detector which uses a grid amplifier will have a resistance- condenser and leak is the more sen-coupled stage followed by a trans- sitive of the two and is the better former stage. If the resistance detector to employ when the valve coupling is connected to the detec- has to provide reaction as well as tor, a fairly low anode resistance, to detect. This type of detector such an 100,000 ohms, should may distort rather badly, however, be used with 1 shunting and for this reason, the anode bend condenser of .0002 mfd. With detector in which a negative grid a coupling condenser of .005 bias is used is sometimes to be pre-mfd. and a grid leak of 2 ferred. Such a detector is rela-megohms, the low notes would be tively insensitive, and strong amplified very well, while the notes signala have to be applied to it for of higher frequency will be reduced antisfactory results.
by only a small amount. If this!
In the anode circuit of both de- is followed by a valve of low im- tectors a condenser has to be used pedance and a good transformer, in order to minimise the amount of the output obtained will be a nearly high frequency current passing perfect copy of the input.
Mr. H. D. Truscott proposed the toast of the year's Medallists, and Sir Hugh P. Allen, in responding, said that the initials R.A.M. repre- sented not only the Royal Academy of Music, but also "Remember Alexander Mackenzie." (Laughter and cheers).
The Senior Warden (Mr. W. 'W.
Cobbett) proposed the guests. Sir
James Dundas-Grant and Dr. Mai- colm Sargent responded. During the evening a programme of music was rendered by Miss Betsy de la Porte, Miss Helen Just, Miss Mar- garet J. Rees, Miss Gladys Gosling, Mr. Emlyn Bebb. Mr. Trefor Jones, Mr. John Andrews, Mr. Leyland White, Mr. E. Kendal Taylor, and Mr. Harry Stubbs.
RADIO TO PHILIPPINES.
FOUR MORE STATIONS PLANNED.
in
Bids for the construction of four radio stations of the bureau of posts will be opened shortly Manila. One of these stations will be established in Baler, Tayabas, in place of the one destroyed during the typhoon last September which brought considerable damage to houses and crops. The new sta- tion will cost P10,000. A modern radio receiving and broadcasting set will be installed in the new sta- tlon,
The other radio stations are esti- mated to cost between P10.000 and P15,000 each. At present there kind in the Islanda operated by the are only 15 radio stations of this bureau of poats. Steps toward the establishment of more radio sta- tions are being taken by the bureau. It was indieatod that not less than 10 radio stations will be erected next year,
YESTERDAY'S SOLUTION.
:
AUG JET 900
JAN BAREİRİ NATAL ED
GUT KEN_CHBOL
AULDG NOTE ATTAR. NO ARD ICE WED
CORRESPONDE
NOS KAN YED
UTOR INTERNATIONAL SINGLATE
BRINGING UP FATHER.
· TUESDAY, DECEMBER, 20, 1927.
K. M. A.
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✪ 1927, by Int'l Future Sepespa." Lin
"Grust,Brital rights reserved
I'LL PUT A STOP TO IT- I'LL BET THERE'S AT LEAST TWO CAKE: EATERS IN THE CROWD
-
A
A J
4, TWO LITTLE GIRLS IN BLUE-LAD- TWO LITTLE
GIRLS IN BLUE- | | |