We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
RADIO DIGES T— Illustrated
August 9, 1924
RADIO COMPLAINTS CLASSIFIED; SPARK WORST OFFENDERS
WHISTLES HOLD SECOND, AND CROSS TALK THIRD
Listeners Give Valuable Data Which
Helps Radio Engineers ; Change of
Wave Lengths Likely
NEW YORK. — The final talk of the series by John V. L. Hogan, past president of the Institute of Radio engineers, before WEAF'S microphone, concluded with a request for specific data regarding interference difficulties experienced by WEAF's listeners. These have yielded very valuable figures regarding the problems to be met before Radio's ills are entirely cured.
The sources of greatest interference were spark telegraph signals, which were rated as the worst source of interference by 39% of those complying with Mr. Hogan's request. "Whistles came second, with 31.4% and cross talk (that is, interference from other Radiocasting stations) 29.6%.
Radio listeners were also requested to indicate their second and third choice as to the most troublesome sources of interference. Whistles were the second cause of interference on 43% of the questionnaires, spark on 37% and cross talk on 20%. Third choice was assigned to cross talk by 60%, whistles by 22.5% and spark by 17.5% of those replying to the questionnaire.
The consistency of these figures are quite notable, spark interference holding first place in the first choice, second place in the second choice and third place in the third choice. Although whistles hold only second place in the first choice, the analysis show it to be quite preponderant as the second worst cause of trouble.
When the first changes in wave length were made, cross talk was, perhaps, the most serious difficulty but improvements in the design of sets and increased experience on the part of those operating them has made this trouble rank third in both first and second choice. t
Arrangements are being made with the principal Radio telegraph companies for reducing the ' amount of traffic handled on wave lengths which are likely to interfere with Radiocast reception.
Radio Conference to Be Held Next Month
Questionnaire Submitted to Supervisors to Ascertain Views
"WASHINGTON, D. C. — The wheels of the department of commerce have started to move toward preliminary arrangements for the third Radio conference which it is expected will be held in this city the latter part of September under the auspices of Secretary of Commerce Hoover.
A preliminary list of twelve questions has been prepared by officials of the department which will be a nucleus for a complete program to be prepared later.
At the present time officials of the department are unwilling to discuss the questions because they feel that the program should be in a little more definite form before any publicity is given to it. It is understood, however, that these questions deal with such matters as wave lengths, the betterment of Radiocast programs, the question of super-power stations and many other matters of particular interest to Radiophans of the country.
Lady Asks Shutdown of Plants to Halt Rain
Asks President to Issue Proclamation— Folly Shown
WASHINGTON, D. C. — The presidential mail contains many curious requests, but one of the most peculiar has just been received from an Ohio lady who asks the president to issue a proclamation shutting down all of the Radiocasting stations in the United States in order to obtain better weather.
The letter goes on to say that the writer is of the opinion that the great quantities of rain which have been experienced in this country this summer have been caused by Radio "and the lady states that she believes that the listeners in of the country would be willing to forego their after dinner amusement for the sake of the poor, downtrodden farmer who is unable to harvest his crops.
The Radio section department of commerce, called attention to the fact that if Radio had anything to do with the rain it would be natural to assume that the rainfall would be greatest where there are the greatest number of Radiocasting stations. Thi? is not so.
The GREBE CLARIFIER
THE first practical, workable solution of the problem of radiation from regenerative receivers. Unlike the "wave-trap" it increases signal intensity.
$30
Increases Selectivity
Increases Signal Intensity
Improves Quality
Prevents Radiation And—
Is Easily Connected
Ask your dealer or write for literature
A. H. GREBE & CO.
Richmond Hill, N. Y.
Western Branch — 451 East 3rd St., Los Angeles, Cal.
Prof. Jansky with Signal Corps
WASHINGTON, D. C. — Prof. C. M. Jansky, formerly of the University of Minnesota, was appointed Assistant Consulting Radio engineer of the Signal Corps recently. His duties will include research problems in Radio telegraphy and telephony in the Signal Corps Radio laboratory at Camp Alfred Vail, N. J.
Chicago Has Another Station
CHICAGO. — Another new station opened on the roof of the Webster hotel, located in this city recently. The call letters assigned to it are^WTL, and their power is 10 watts. Lem Brosseau, is chief announcer. They are operating on a wave length of 268 meters. They expect to increase the power of this station soon.
No. 25 of a Series Featuring Experiences of "ALL-AMERICAN" Users
"Los Angeles to Quebec— Ail-Americans Cannot Be Beat"
By C. G. Miles, Fort Wayne, Ind.
"I have been using a single circuit regenerative (detector and two stages of audio frequency) employing two of your 5 to 1 ratio audio transformers and have had the pleasure of listening to KFI and KHJ at Los Angeles, KFO at San Francisco, CFCN at Calgary, KGO at Oakland and CJCM at Mont Joli, Quebec, Canada. Of course these stations were not brought in at this time of the year, but all were heard on a small loud speaker during
All the better dealers sell the
All American Audio Frequency Transformers come in three ratios: the 3 to 1 at $4.50, and the 5 to 1 and 10 to 1 at $4.75. There are no better instruments on the market at any price.
the fore part of April of this year.
As I said before, your transformers cannot be beat, and this is the opinion of most of the owners of receiving sets that I have talked to."
THE KEY BOOK IS OUT I
If your copy hasn't come, it will very soon. If you haven't ordered it, don't delay another day, for it's "the best hook-up" book ever published" — there's nothing else like it! Send 10c today, coin or stamps.
ALL-AMERICAN"
RAULAND MFG. CO., 2640 Coyne St., CHICAGO
PIOKEEKS IN THE INDUSTRY
Audio and Radio
Frequency; Power Amplifying (input and output)
Over three-quarter
million in use.
Standard on the
better sets
AMPLIFYING TRANSFORMERS Largest Selling Transformers in the World
Are You Ready?
The biggest radio season of all is now opening. Politics, opera, comedy, fights, speeches, games, sermons — every form of entertainment and education will be at your command. Make ready now. Insure increased power for your set by replacing your old condenser with the new
THE LOW LOSS
GENERAL INSTRUMENT CORPORATION
GROUNDED ROTOR CONDENSER
Actual tests have proved that dielectric losses have been practically eliminated by this marvelous condenser. Greater selectivity, more distance and a remarkable increase in volume naturally follow its use.
Minimum Maximum
Type 46X 11 Flate 5 MMFD. .00025 MFD $4.50
Type 46A 13 Flate 6 MMFD. .0003 MFD 4.50
Type 46D 21 Plate 9 MMFD. .0005 MFD 5.00
Type 46F 43 Flate 15 MMFD. .001 MFD 5.50
AT YOUR DEALER Otherwise send purchase price direct to us and you will be supplied.
General Instrument Corp.
pm^ 423 Broome Street
ffifj NEW YORK CITY