JULY, 1922 PRICE 25 CENTS RADIO FOR EVERY PLACE AND PURPOSE ,o4r-.. .. An Evening with Dr. Alexander Graham Bell Protection of the Receiving Antenna A Church with a Mighty Congregation A Simply Constructed C. W. Transmitter Our Amateur Radio Reserve DOUBLEDAY, PAGE & COMPANY, Garden City, N. Y. www.americanradiohistory.com -- --- . --c More Enchanting Than \ Aladdin's Dreams THE masterwork of 20th Century science is the triumph of West- inghouse radio engineers in perfecting the AERIOLA GRAND a de luxe receiving instrument of exquisite beauty and purity of tone combined with simplicity of operation. Distributed through the 20th Century Radio Cor- poration, national distributors for Westinghouse and it other high grade radio apparatus. This Company is i also in a position to make immediate deliveries of Westinghouse Type RC Westinghouse Aeriola Sr. Westinghouse Aeriola Jr. The nation's most dependable radio ap- paratus. Write to us to -day for the name and address of your nearest dealer 20th Century Radio Corporation Executive Offices Suite 710, Straus Building 565 Fifth Avenue, New York BRANCHES Detroit, Mich. Norwalk, Conn. Newark, N. J. Brooklyn, N. Y. White Plains, N. Y. 2 -4 Mamaroneck Ave. 2311 Woodward Ave. 17 High Street 587 Broad Street 102 Flatbush Ave. White Plains 1030 Main 7809 Norwalk 675 Ring 4 Market 3265 Sterling 6349 National Radio Distributors www.americanradiohistory.com Radio Broadcast ROY MASON, EDITOR ARTHUR H. LYNCH, TECHNICAL EDITOR 111) !hi Fr CONTENTS FOR JULY, ,1922 Dr. Alexander Graham Bell Frontispiece THE MARCH OF RADIO 191 WHEN DE WOLF HOPPER BROADCASTED TO HIS BIGGEST AUDIENCE - 198 WHAT EVERYONE SHOULD KNOW ABOUT RADIO HISTORY PROF. J. H. MORECROFT 199 AN EVENING WITH DR. ALEXANDER GRAHAM' BELL - DONALD WILHELM 205 INCREASING THE SELECTION POWER OF A RADIO CIRCUIT JOHN V. L. HOGAN 211 PROTECTION OF THE RECEIVING ANTENNA G. Y. ALLEN 214 A CHURCH WITH A MIGHTY CONGREGATION - ARCHIE RICHARDSON 218 RANDOM OBSERVATIONS ON RUNNING A BROADCASTING STATION H. M. TAYLOR 223 RADIO PERSONALITIES 228 REGINALD AUBREY FESSENDEN LUCILLE JOYCE NEW RADIO NET FOR ROGUES DONALD WILHELM 231 HOW RADIO CAME TO INDEPENDENCE, KANSAS - THOMAS M. GALEY 234 HOW TO BEGIN TO ENJOY RADIO - - - CAPT. LEON H. RICHMOND, U. S. A. 236 A SIMPLY CONSTRUCTED AND OPERATED SHORT RANGE C. W. TRANS- MITTER ZEH BOUCK 24o OUR AMATEUR RADIO RESERVE - - - - MAJOR PAUL W. EVANS, U. S. A. 243 RADIO FOG SIGNALS AND THE RADIO COMPASS 247 THE AUDIO PILOTING CABLE IN THE AMBROSE CHANNEL DONALD WILHELM 249 PROGRESS OF RADIO IN FOREIGN LANDS 251 RADIO HELPING US ENJOY THE SUMMER ARTHUR H. LYNCH 255 RADIO IN REMOTE REGIONS 262 THE GRID -QUESTIONS AND ANSWERS 264 PRESENT RADIO BROADCASTING STATIONS IN/THE UNITED STATES - - 270 Copyright, 1922, by Doubleday, Page & Co. All rights reserved TERMS: $3.00 a year; single copies 25 cents F. N. DOUBLEDAY, Pres. ARTHUR W. PAGE, Vice -Pres. NELSON DOUBLEDAY, Vice -Pres. RUSSELL DOUBLEDAY, SeC'y. S. A. EVERITT, Treas. JOHN J. HESSIAN, Asst. Treas. DOUBLEDAY, PAGE & CO. THE WORLD'S WORK COUNTRY LIFE THE GARDEN MAGAZINE SHORT STORIES EDUCATIONAL REVIEW CHICAGO: People's Gas Bldg. GARDEN CITY, N. Y. NEW YORK: 120 W. 32nd Street BOSTON: Tremont Bldg. LOS ANGELES: Van Nuys Bldg. www.americanradiohistory.com DR. ALEXANDER GRAHAM BELL Inventor of the Telephone www.americanradiohistory.com JUL -7/922, Oci e,aaxcs ,} RADIO BROADCAST' Vol. 1 No. 3 July, 1922 The March of Radio REPORT OF THE RADIO TELEPHONE COMMITTEE AVERY important step was taken in public broadcasting, 40o miles or more from the progress of radio telephone de- the sea coast, exclusive, 65o -7oo; Marine radio velopment when the committee, telephony, non-exclusive, 525-650; Marine called by Secretary Hoover, handed telegraphy, exclusive, 525-650; Aircraft radio in their final report, containing re- telephony and telegraphy, exclusive, 500-525; commendations as to the proper allocation of Government and public broadcasting, exclu- wave lengths for the different radio telephone sive, 485-495; Private and toll broadcasting, services now existing, or anticipated. The 285-485 ; Restricted special amateur radio committee, under the leadership of Dr. S. telegraphy, non -exclusive, 3 to; City and State W. Stratton, the Director of the Bureau of public safety broadcasting, exclusive, 275-285; Standards, was made up of experts from all Technical and training schools (shared with branches of radio activity -the military and amateurs) 200 -275; Amateur telegraphy and civil services of the Government, commerical telephony, exclusive, 150 -200 meters (this radio engineers, college professors, and repre- makes the total wavelength range assigned to sentatives of the amateurs, all combined to amateurs 15o -275, part of it being shared with work out what seemed to be a reasonable di- the technical schools); Private and toll broad- vision of the frequencies available for radio casting, exclusive, too-15o; Reserved, all be- traffic. low too meters. The recommended assignment of wave Of course we are principally interested in the lengths was as follows- Transoceanic experi- wavelengths to be used for broadcasting. ments, non -exclusive, 5000 -6000 meters; Fix- Government broadcasting is defined as that ed service, 2850 -3300; Mobile service, non- done by departments of the Federal Govern- exclusive, 2500-2650; Government broadcast- ment; public broadcasting as that carried on ing, non -exclusive, 1850-2o5o; Fixed station, by public institutions, such as Universities; non -exclusive, 1550-165o; Aircraft radio tele- presumably church broadcasting will come phone and telegraph, exclusive, 1500 -1550; under this classification. Private broadcasting Government and public broadcasting, non- signifies that carried on, without charge, by exclusive, to5o -15oo; Radio beacons, exclusive, any communication company, newspaper, etc. 950-1050; Aircraft radio telephone and tele- Such broadcasting, if charge is made, comes graph, exclusive, 85o -95o; Radio compass ser- under the classification of toll broadcasting. vice, exclusive, 75o -85o; Government and In view of the interest of the public, as a public broadcasting, 200 miles or more from the whole, in broadcasting, it was strongly urged sea coast, exclusive, 700 -750; Government and that point -to -point radio communication be www.americanradiohistory.com 192 Radio Broadcast discouraged; it is quite evident to any one that of the receiving set used and upon the skill of the use of one "channel" in the ether for con- the operator in adjusting it, but with the versation between two individuals is entirely average receiving set sold to-day it seems that out of the question unless such communication there may be ten or fifteen channels; if all the is impossible by any other means. Thus receivers in use were of the better types and in point -to -point communication by radio must the hands of skilled operators, probably twenty be allowed only for shore -to -ship, to light -ship, or thirty channels would be available, but of or to isolated islands, etc. The granting of course, such is not the case. Probably there licenses to companies organized for commercial will be not more than eight useful channels in radio traffic between cities should not be per- this range of frequencies. mitted. It is to be pointed out that if such The question must be indeterminate to a procedure had been followed during the last considerable degree because of the possibility few years, it would not have been necessary of large differences in the various signal to get out injunctions to prevent such inter- strengths. ]f, for example, two stations of ference as was caused by the operation of the equal power were transmitting from New York Intercity Radio station in New York City. and were being received fifty miles away, both Such unnecessary use of radio always impedes would be of equal strength, and it would be its progress for the financial benefit of a few possible to adjust the receiving sets for no in- men more interested in their own fortunes than terference with two wavelengths as close to- in that of the radio art. Wire telegraphy and gether perhaps as 300 and 310 meters. But telephony furnish ample means of communi- if one of the transmitting stations was within cation for commercial traffic, in fact, it seems a few miles of the receiving set, and the other likely that if inquiry were made 'it would be fifty miles away, then, in order to hear the dis- found that much of the " radio". traffic of such tant station without interference from the companies is sent over lines leased from the nearby station a wavelength difference of 30 wire companies. meters or more would be necessary. Private and toll broadcasting are also al- HOW MANY SIMULTANEOUS BROADCASTS ARE lowed another frequency band from 100 meters POSSIBLE? to 150 meters; although this is a comparatively IT WILL be seen that for private and public narrow band, there are several channels possible broadcasting the committee recommends because of the large difference in frequency of three bands of frequencies, rather widely the two limits, namely 1,000,00o cycles. It separated. Public broadcasting, such as might is quite likely that there are twenty more be done by a University carrying on extension channels available here for good receiving sets work or the free lectures sent out by city de- and five to ten with ordinary sets. lt must be partments, have wave lengths from 1050 meters pointed out, however, that practically none of to 1500 meters; this range should permit the the receiving sets which have been supplied to simultaneous transmission of about eight mes- the public so far will be much good for receiving sages without undue interference. In estimat- these low wavelength signals; most of them ing how many simultaneous messages are pos- cannot tune for a signal of such low wave- sible (or how many "channels" are available) length and those that can are very inefficient it is assumed that the receiving set is a good for such high frequencies.