INTERNATIONAL AGREEMENTS OTHER THAN TREATIES [62 STAT. December 24, 1947, Arrangement between the United States of America and Canadarespecting and April 1, 1948 T.I. A. S. 1802] engineering standards applicable to the allocation of standard broad- casting stations (540-1600 kcs.) . Effected by exchange of notes signed at Washington December 24, 1947, and April 1, 1948; entered intoforce April 1, 1948. The Acting Secretary of State to the CanadianAmbassador DEPARTMENT OF STATE WASHINGTON Dec 24 1947 EXCELLENCY : I have the honor to refer to discussions in Atlantic City, New Jer- sey, between representatives of the Government of Canada and rep- resentatives of the Government of the United States concerning the matter of a mutual understanding as to engineering standards applica- ble to the allocation of standard broadcasting stations in the band of frequencies extending from 540 to 1600 kilocycles. As a result of those discussions, the Government of the United States agrees to enter into an arrangement with the Government of Canada, effective as of the date of their reply, permitting the mutual applica- tion of the following engineering standards which will be considered as amending those engineering standards already in effect between the United States and Canada by virtue of provisions set forth in the North American Regional Broadcasting Agreement signed at Habana, 55 Stat. 1005. Cuba, on December 13, 1937, as continued in application by the terms of the Interim Agreement (Modus Vivendi, Washington, Feb- 60 Stat. s62. ruary 25, 1946.) "1. 10% Skywave Signal Range Curves, 540 kilocycles to 1600 kilocycles, incorporating latitude effect. "The attached family of curves entitled '10% Skywave Signal Range, 540 kilocycles to 1600 kilocycles', designated Figure 1-A, showing resultant skywave fields from an antenna of height H=0.311 wavelength radiating 100 milivolts per meter at the angle 0 (theta) pertinent to transmission by one reflection, will be recognized as ac- ceptable for use in lieu of the 10% skywave curve appearing in Ap- pendix V of the North American Regional Broadcasting Agree- 55 Stat. 1027 . ment, in computing signal intensities at the station receiving in- terference. It is further recognized that the 10% Skywave Signal Range Curves, 540 kilocycles to 1600 kilocycles, will be applied only to allocation matters on regional channels, and is not considered ap- plicable to allocation matters as between Class II stations on clear channels, in which cases Appendix V will be controlling. "2. Angles of Departure versus Transmission Range. "(a) The attached family of curves entitled 'Angles of De- parture versus Transmission Range' for use in the band 540 2652
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