1924-03-08 — Page 17

THE HONGA

TELEGRAPH.

SATURDAY

MARCHA

RADIO NOTES AND NEWS

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GECOPHONE

A REVOLUTION IN WIRELESS VALVES

D.E.3

MARCONI VALVES.

MADE AT THE OSRAM LAMPWORKS

800 HOURS USE FROM ONE DRY CELL FILAMENT CURRENT 0.06 amps.

THE G. E. C. OF CHINA, LTD.

Telephone 518.

Queen's Buildings,

Hongkong.

Transatlantic Telephone Service Experiment.

At the end of 1922 there were of magnification, developments only three broadcasting stations have been made by utilizing in operation in this country, of valves to obtain the maximum which the newly-formed British magnification by the dual system,

valve is Broadcasting Company had not wherein► assumed full control, says a first as a high-frequency writar in the Manchester Guardias magnifier and again as a low Commercial. The conditions under frequency magnifier. By utilis

RADIO

which reesiving licences would ing a crystal as a detector, for COMPLETE SETS OR PARTS

be granted had been laid down ther economy in filament has by the Postmaster General, but been obtained in same valve sets. owing to the limitations of the The introduction of dull emitter first scheme and the uncertainty | valves has been a great improve- of their position a large propor-ment from the battery point of tion of the public abstained from view, as some of these require purchasing sets or taking out less than one-tenth of the heating licences. This uncertainty reacted current of the bright flament greatly to the detriment of the valves normally used. Although radio manufacturing industry. at present theaa dull emitters aro During the year 1923, the rather expensive, the increased British Broadcasting Company cost should be compensated for has taken over or replaced the by an increased life of the valve three original stations, and built under the dull conditions of work- and equipped five more, thus ing the filament. completing the original scheme. These stations are so placed geographically as to be as close as possible to the most populated centres, at the same time giving the best service possible to the country as a whole. As a result of the year's working consider able experience as to so-called "blind spots" or bad receiving localities has been obtained, and

·USE OF LOUD SPEAKERS.

Loud speaker sets have now come into general use, and al- though the quality of speech and music still leaves much to be desired, good reproduction can be obtained if the volume of sound is kept down within reasonable limits.

The wide use of wireless both it is now proposed to install for commercial and entertain- number of relay stations, each to mant purposes, has caused con serve a particular area of popsiderable interference on the ulation otherwise poorly placed limited wave lengths available. for broadcast reception. To ren-As the number of transmitting der this possible the broad- stations increases the difference! cast band of wave lengths in wave length between stations has been widened and now ex-will become smaller, and conge- tends from 300 to 500 metres quently more selective apparatus The first relay station was recent-

must be used. In connection ly opened at Sheffield, and with the interference experienced second is to be opened soon at Plymouth.

on the broadcasting wave length band from ship and shore spark Great strides have been made stations, this is at present towards technical perfection in unavoidable and must be review- the transmissions from theed from the point of view of the various stations by improvements practical importance of these in studio layout, in microphone stations for the safety of life at design and

control and sea

monitoring circuits In the The interference due to oscillat- matter of programmes noteworthing aerials caused by neighbour- progress may be claimed. both asing receiving stations is still very regards material and artists. Of troublesome. great technical interest is the development of simultaneous

In comparison with the short-

broadcasting of the same prowave and low-power transatlantic gramme from two or more stat- trials should be mentioned the ions by linking the control circuits America-England trials carried through trunk telephone lines of out by the American Telegraph. the Post Office. Much pioneer and Telephone Company in con- work has had to be done by junction with the Radio Corpora- the engineers of the British Brotica of America and the Western adcasting Company to assure the Electric Company. These trials success which has attended their were instituted to ascertain what power would be necessary to give efforts in this direction.

a satisfactory or even a restricted commercial telephone service across the Atlantic. A very demonstration WES

EFFECT ON RECEIVING SETS.

a

transatlatic telephone. even if restricted few hours a day. hava

wide field

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AGENTS 1.

The China Soap Co., Ltd. Shangbei-Hongkong-Tientsin- Hato Tainant.Mauk des

HALL'S

DISTEMPER

The KING of Water Paints

The development of the broad-successful casting service have naturally given during the early hours of a favourable affected the design of broadcast the morning at ing receiving sets. From the time of the yaar, but the trials entertainment point of view the have been continued throughout

satisfactory

are results most

the year and observations taken obtained from the nearest station on the varying atmospheric con- or the station giving the greatest ditions from season to season. A signal strength in the particular reliable lorality. In addition the introduc- service, tion of simultaneous broadcast-to ing has tended to make it legs would necessary for the receiving sets of application for speeding up to be capable of selecting any re-intercommunication between the quired station. The reception of two countries. stations cther than the local station is generally subject to interference from atmospherics, In connection with the develop- spark stations, oscillating re-ment of reception on commercial ceivers and periodic variations of telegraph services, the general strength, the latter effect being tendencies have been towards noticeable at ranges of 100 miles greater selection on account of or more. Consequently the

the increasing number of high reception of more distant stations

power stations. By the use of the remains more of a manipulative latest form of the Beverage type: achievement than a source of!

of antenna simultaneous general entertainment

ception of several stations is Broadcast receivers are primaricarried out on a single aerial, ly designed for simplicity, and while the uni-directional proper generally speaking two tuning ad-ties of aerial systems, which are justments only are arranged for now being utilised have greatly Close attention has been given to reduced the interference from the general appearance of the atmospherics. These improve-|| sets, some of which are arranged ments in aerial systems,{ in handsome cabinets and pieces together with high frequency of furniture. The roost striking and low frequency filter sys- teatimony to the popularity of tems in the receivers, have broadcasting is shown in the in- added to the reliability of long creasing number of aerials of all distance communication even to descriptions and appearances the extent of permitting high- throughout the whole country. speed automatic working. By ary seal between the copper municate with incoming and cut- going ships within a radius of The necessity for larger erialssup relaying the received signals anode and the glass container. ported by masts is diminishing as from the respective receiving A new departure in high-power from 150 to 300 mile of Toko- a result of the experience obtain stations to a central station, the transmitting valves is the Hol-hama.

Such a service will be wel ed with small aerials or even wireless services are being con-weck valve, the anode of which internal aerials which have been trolled and worked in a similar is water cooled. This valve is comed by shipping companies found to give greater selectivity way to ordinary land-line tele-capable of being assembled and and by those who wish to meet

dissembled at will, so that a new friends arriving at Yokohama, with sensitive valve receivers: graph circuits.

re-

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The necessity for filament bat- The development in transmitt filament may be inserted after Hitherto all wireless messages teries and high tension batteriesing valves has been concentrated the valve has been in use for for Yokohama have been receiver still remains a great drawback to increasing the output and some time. The various com at Choshi wireless station and the installation of a multi-valve dissipation in the valve itself. ponents are jointed together and forwarded to Yokohams which receiver on account of the diffi-The introduction of water-cooled a special pump is used while the frequently caused delays. culties of charging in many housesives, in which the anode is valve is in operation to retain Before the earthquake, the

mga harbour office used the signs holds, though where electric power cooled by water circulation, has the necessary Vacuum,

tower which food in front of the is available wall charging sets allowed greater power dissipe- NEW YOKOHAMA STATION, both for alternating and directions and consequent outputs. Yokohams harbour officials Oriental Palace Hotel. The ne currents may be installed. These improvements are confined have begun the installation of a radio station, will communica

In order to reduce discharge, to

oasi fa detalle - wod, wireless station for the conven- 150 miles by day and 300 miles at currents for any particular degree, zne for obtaining the ne