General Order 40 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "General Order 40" in English language version.

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broadcastengineering.info

"History of the Directional Antenna in the Standard Broadcast Band for Purpose of Protecting Service Area of Distant Stations" by Raymond M. Wilmotte, IRE Transactions on Broadcast Transmission Systems, (Volume: PGBTS-7, Issue: 1), February 1957, pages 51-55.

"Amendments to Regulations", Radio Service Bulletin, January 3, 1922, page 10.
"Subcommittee No. 2: Allocation of Frequencies or Wave Lengths to Broadcasting Stations", Recommendations for Regulation of Radio adopted by the Third National Radio Conference, October 6-10, 1924, pages 16-17.
"General Order No. 40" (August 30, 1928), Radio Service Bulletin, August 31, 1928, pages 9-10. The Davis Amendment was repealed in 1936.
"Revised list of broadcasting stations, by frequencies, effective 3 a. m., November 11, 1928, eastern standard time", Second Annual Report of the Federal Radio Commission for the Year Ended June 30, 1928, Together With Supplemental Report for the Period From July 1, 1928 to September 30, 1928, pages 200-214.

"Reallocations Improve Reception", Radio Retailing, December 1928, pages 46-47.