RADIO SERVICE BULLETIN INDEX OF REGULATIONS AND MISCELLANEOUS ARTICLES APPEARING IN THE RADIO SERVICE BULLETIN, YEARS 1920 TO 1931 Subject Month Year Abbreviations: New international_____________________________________ ._____________ September__ 1920 Accounts: Instrirctionsfor handling traffic_________________________________________________ June________ 1922 International radio accounting section transferred from Navy Department to August______ 1924 Department of Commerce . Aeronautical (aircraft) : Operator and station licenses -------------------------------- June________ 1930 Air-line distances: Tableof,between 15cities inUnited States------------------------ March______ 1928 Amateur stations and operators: War-time restrictions on amateur operatorsand amateur stations removed-------- October_____ 1919 Regulations regarding licensed transmitters must be inductivelycoupled--------- -----do------- 1919 Regulations 3 and 4, act of Aug. 13, 1912, must be observed---------------------- _____do_______ 1919 Message from Hartford to Washington direct on 200 meters______________________ February___ 1920 Stations may operate pending action upon application for licenses_______________ May________ 1920 Restrictions on special stations-stations not capable of adjustment on 200-meter April________ 1921 wave . Use of 175, 200 or 225 meters proposed for amateur broadcasting_________________ February___ 1922 American radio relay league trans-Atlantic tests of 1922--------------------------- October_____ 1922 New station regulations______________________________ .__________________________ July_________ 1923 Allowed to use short waves______________________________________________________ August______ 1924 New regulations__________________________________________________________January_____ 1925 Restricted in communication with commercial and government stations_________ February___ 1925 Picture apparatus authorized for use by amateurs -------------------------- June________ 1925 Allowed to use radiotelephone equipment ---------------------------------- December___ 1925 List of Cuban experimental stations_____________________________________________ October_____ 1927 Licensing and operation of amateur stations------------------------------------- January_____ 1928 Revised station regulations_____________________-________________________________ March______ 1928 Do_________________________ .________________________________________________ September__ 1928 Do_____________________________________________________________________ .____ December___ 1928 List of Cuban stations__________-_________-_____________________________________ August______ 1929 Revised station regulations______________________________________________________ January_____ 1930 Revised stationregulations, General Order No .84,Apr. 4,1930-------------------- ApriL------ 1930 Apparatus: List of vessels on Great Lakes equip~ed with vacuum-tube receivers____________ -----do---- 1924 Investigation of interference caused ?Via Cottrell electric precipitator------------ June________ 1924 Investigation of power-line interference_____________________:____________________ _____do______ 1924 Radio Interference from electrical precipitators-------------------------------___ August______ 1924 Interference from harmonics_________________________________________________ .___ December___ 1924 Increase power for broadcasting stations_________________________________________ _____do_______ 1924 Testing and adjusting piezo oscillators by Bureau of Standards_________________ January_____ 1928 Do__________________________________________________________________________ February___ 1928 Do__________________________________________________________________________ September__ 1928 Do_______________________________-_____________________________-____-_______ January_____ 1930 Broadcasting stations : Must not accept public messages from other stations-3B0 meters authorized _____do_____ 1922 concerts, etc.; 485 meters for crop and weather reports. Commercial second-class operator's license or higher required for operation______ -----do----- 1922 List of United States broadcasting stations______________________________________ ApriL_-____ 1922 Regulations pertaining to the broadcasting of weather, crop, and market infor- May_______ 1922 mation. List of United States broadcasting stations -------------------------------------- tpriL______- 1922 Do__________________________________________________________________________May________ 1922 Do__________________________________________________________________________ July--------- 1922 Class B (400-meter wave) established, Regulations 57, Radio Laws and Regula- September__ 1922 tions, edition Aug. 15, 1919 amended. Class B regulations amended____________________________________________________ October_____ 1922 Operators of broadcasting stations cautioned regarding violation of sec. 2, act of January_____ 1923 Aug. 13, 1912. List of United States broadcasting stations_________________________________ April________ 1923 Test perinds limited, class B regulations, class O (380 meters), established, eta___ May________ 1923 Developmentregulations________________________________________________________ _____do_______ 1923 List of United States broadcasting stations ----------------------- t------------- February___ 1924 New York conference recommends discontinuance of 450 meters by ships________ _____do_______ 1924 New York conference on radiating receiving sets________________________________ _____do_______ 1924 List of British broadcasting stations_____________________________________________ March______ 1924 List of French broadcasting stations --------------------------------------------- -----do----- 1924 List of Cuban broadcasting stations --------------------------------------------- -----do----- 1924 List of United States broadcasting stations -------------------------------------- -----do---- 1924 List of Canadian broadcasting stations ----------------------------------------- _ May________ 1924 List of Mexican broadcasting stations ------------------------------------------- -----do----- 1924 List of Argentine broadcasting stations__________________________________________ July_________ 1924 List of foreign broadcasting stations_____________________________________________ November__ 1924 Interference from harmonics_____________________________________________________ December___ 1924 Increased power________________________________________________________________ _____do_______ 1924 List of United States broadcasting stations -------------------------------------- February___ 1925 Do___________________________________________________________________ .______ _____do_______ 1925 Do__________________ ._______________________________________-_______________ June -------- 1925 Do_________________________________________-_____________________September__ 1925 List of foreign broadcasting stations__________________________________1925 List of United States stations equipped so as to suppress harmonics-------------- November__ 1925 Additional list of United States stations equipped so as to suppress harmonics___ December___ 1925 List of United States broadcasting stations______________________________________ January_____ 1928 RADIO SERVICE BULLETIN 21 INDEX OF REGULATIONS AND MISCELLANEOUS ARTICLES APPEARING IN THE RADIO SERVICE BULLETIN, YEARS 1920 TO 1931-continued Subject Month Year Broadcasting stations-Continued . Additional list of United States broadcasting stations equipped so as to suppress January_____ 1926 harmonics. List of Canadian, Cuban, and Mexican broadcasting stations in order of fre- February___ 1928 quency . Broadcasting (low and high frequency) stations: List of broadcasting stations in vicinity of Chicago equipped with piezo crystal -----do------- 1926 oscillators. Additional list of broadcasting stations in vicinity of Chicago equipped with March______ 1926 iezo crystal oscillators. List of foreign broadcasting stations --------------------------------------------- July_________ 1926 List of broadcasting stations in Great Britain and Northern Ireland------------- November__ 1926 List of United States broadcasting stations --------------------- December___ 1926 List of European broadcasting stations ------------------------- -------______________ .__ do_______ 1926 List of Canadian, Mexican Cuban, and Haitian stations_____________________January1927 List of United States broadcasting stations issued temporary permits------------ April______ 1927 List of United States broadcasting stations effective June 15, 1927_______________ May________ 1927 List of Canadian stations_________________________________________.______________ July_________ 1927 List of United States relay broadcasting stations -------------------------------- September__ 1927 List of Cuban broadcasting and experimental stations ------------------------- October_____ 1927 List of United States broadcasting stations -------------------------------------- January_____ 1928 Do__________________________________________________________________________ February ._ . 1928 List of broadcasting stations using 200 watts or more in Eastern Hemisphere____ -____do__.___ 1928 Central and South American broadcasting stations using 500 watts______________ -----do------ 1928 List of Mexican broadcasting stations------------------------------------------- March______ 1928 List of foreign short-wave stations ----------------------------------------------- April________ 1928 Broadcasting stations