1927-01-07 — Page 8

THE HONGKONG TELEGRAPH. FRIDAY, JANUARY

1927.

CURRENT RADIO TOPICS.

NOTES AND NEWS-LOCAL AND OTHERWISE.

SUPER TRANSMITTER.

STATION THAT ENCIRCLES

THE GLOBE.

Eighty times more powerful

LOW WAVE TESTS.

BROADCASTING TROUBLES INVESTIGATED.

Schenectady, Dac. 6th-The than the ordinary broadcasting difficulties attending broadcasting station transmitter; four times as on low wavelengths, for which powerful as any other United some broadcastors have been hop- ing, are brought out strikingly in Bistel naval station-

tests just completed. by radio en gineers of the General Electric Company here,

That's the new Chellas Heights naval radio station vacuum tube transmitter just completed and in stalled at San Diego, Califorma. The greatest argument these On the navy's newest and most tests produced. against popular powerful transmitter messages broadcasting" on low wavelengths can be sent to American warships" was the enormous "skip" of anywhere in the world at night jumps made by the waves before The set has a range of 12,600 they could be caught by a receiver. miles enough to girdle the globe. Second only to this was the in- The broadcaster is intended creasing fading that accompanied strictly for dots and dashes. The the decrease of wavelengths. human voice cannot be heard over

With these important difficul-

it in the absence of special aptius there is no hope for short paratus.

wave broadcasting, at least below 100 meters.

Code messages may be sent over it at the rate of 100 words a min- ute. Compare this with commer cial rates of about 40 words.

CAN'T RECEIVE.

1:

The tests were made over u periods of a month, last spring, and had the co-operation of more The Chellas" Heights station, thin 600 amateur members of the American Radio Relay League and which alts in the shadow of

its corresponding associations mountain, alop a hill, and over- looks the Pacific ocean 11 milea throughout the world. distant, is a remote control station. came to the engineers from every

It is paed for sending purposes part of the globe. only.

་་

Reports

From the information collected,

It broadcasts automatically mes-the, engifeure came to the follow- sages from a sending key on Pting conclusions:

Loma.

The messages fly from antennal- strung on three masts, onch 600)

"

THE FINDINGS.

Fifteen meter signals can't be feet high, the three forming a heard over a "skip distance" from triangle 1100 feet on 22 side. the transmitter of from 600 to 900 Crosa-arms at the top are 60 miles by day and 1000 miles by Teet in length.

night. This skip distance seem Six transmitters make up the ed to decrease with the increase sending apparatus. The 80,000- of the wavelength, just na fading' watt tubes replace 200,000-watt degreased in the same way. Fad- are transmitters.

ing, also, was more pronounced at night than by day.

TRIAL STATION. "The significance of this new For. great distances, the best of Bet,"

Bays Lieut. Com. "A. C. the short waves was that of 32.79 This Thomas, communications officer meters or 9150 kilocycles. for the leventh naval district, wave reached the maximum dis- "lies in the fact that, if it proves tance, halfway around the world. completely successful, other navalį The host fl-around short wave Tadio stations will give up the ure seemed to be that of 50.2 meters, for the tube,

5970 kilocycles. This proved Already we have noted that to have no, skip distance, being broadcast fans-within-the-very-audible-clóso-to-the-transmitter,. shadows of the towers suffer no had a useful day range up to 1100 interference when the station runs miles and good signal strength at 'full blast."

night up to 2650 miles.

་

This station is one of three re- Both vertical and horizontal cently built by a large American types of antennae were employed compony. One went to Japan.in the transmission tests, but no The third to South America.

pronounced differences were noted between them.

Tho 20,000-watt tube in this set de the largest yet made for prac tical use. The copper plate heals so rapidly water is used for cool- ing. Twenty-two volts of clep-! tricity light the filaments. The

plates take as high as 15,000 volts: The station cost $1,500,000; the

INDUSTRY'S EXPANSION.

Chicago: From 37,000 radio re-

new sending apparatus $80,000.ceiving sets in operation in 1920,

RADIO JOTTINGS.

A recent radio product la a loud

the, industry has developed to the point where more than 5,000,000 homes are equipped with radio, re- ports Mr. J. B. Hawley, chairman. of the statistical committee of the Radio Manufacturers Association. .In 1922, "radio sales amounted to

speaker that can be heard at a dis-316,500,000 for sets, parts and ac-

tance of 10 or 12 miles.

"

cessories. This year, the total sales will mount to $520,000,000, "Nomers in broadcasting should be assigned the lower band of which more than half will have of wavelengths, leaving the higher been set for new receivers. ones for owners of stations who

By Mr. Hawley's figures, the in- have pioneered and developed the dustry has increased almost 100 Ortaya Powell Crosley, Jr., an per cent. each yeng for the last four years, although this percent American radio manufacturer.

ago-is-beginning to show a decline, Although separated from his due to the high figures attained. business by several thousand miles,

*

From 1920, the number of re- while on a trip to New Zealand, ceivers in use by years, has been Mr. A. J. Baldwin of Portland, as follows: 1920--37,000; 1921-

1922-150,000; 1923 Oregon, kept in touch with hie 75,000; firm through the co-operation of 2,000,000; 1924-3,000,000; 1925- amateur radio stations in New Zea-4,000,000; 1926-5,000,000. 2.y- land and Portland,

+

An instrument combining the the country is maintained by KOA, principles of a piano and radio Denver, at the Union Pacific rail- has been invented. The instru-roud shops. A concert is broad- ment has a keyboard similar to a cast at this studio once a week piano but each key is connected by the Union Pacific employes to a radio vacuum tahe. Every band. Plenty of train-yard at- time a key is depressed a radio mosphero is supplied by shrill 'oscillator circuit gives rise to a whistles of passing locomotives, pure note in the loudspeaker. clanging bells and the vibrant ring

of hammer on anvil

*

*

Afternoon programmes for broadcast stations have been gain A motion picture company has ing in number and popularity in filmed announcers and artists at America. It is expected that dur- work in the studio of WSAI, Cin ing the winter season most radio cinnati. The picture will soon be stations will make full use of their released in leading picture horasa afternoon time,

of the country and fans will have an opportunity of seeing in "ac- One of the most picturesque tion" persons they have listened to make shift broadcasting eludios in on the air.

LIGGETT MYING TORACCO Co.

A clear field ahead!

Gain after gain for

natural tobacco taste

IT stands to reason the better the tobaccos, the better the taste. And when matched to bring out natural tobacco character-better still!

There's character in Chesterfields-natural charac ter-the natural mildness and good taste of fine tobaccos perfectly blended. How else account for Chester- field's record-America's fastest-growing cigarette for four consecutive years? How else than through a natural goodness which men find in no other cigarette?

Chesterfield

CIGARETTES

That Satof They Satisfy

If you cannot obtain Chesterfield Cigarettes from your tobaceo dealers, Duty Pald or In Bond, please call-up-C. Chan & Co., 10 Des Voeux Road Central, phone No. C. 4955.

FOR SALE

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