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 be deemed to include and to consist of the following countries: Canada, Cuba, Dominican Republic, Haiti, Mexico, Newfoundland, and United States of America. 3. Standardbroadcast band. The standard broadcast band shall be deemed to be the band of frequencies extending from 550 to 1600 kc, both inclusive, both 550 kc and 1600 kc being the carrier frequencies of broadcasting channels as hereinafter defined. The Governments 49 Stat. 2453; 54 agree, subject to the provisions of Article 7 of the General Radio tat. 1429. Regulations annexed to the International Telecommunications Con- vention, Madrid, 1932, that this band of frequencies shall be allocated exclusively to broadcasting in the Region. 4. Sovereign right to use channels. The sovereign right of all countries, parties to this Agreement, to the use of every channel in the standard broadcast band is recognized. The Governments recognize, however, that until technical developments reach a state permitting the elimination of radio interference of international character, a regional arrangement between them is necessary in order to promote standardization and to minimize interference. 5. Regional character of Agreement. The Governments recognize that this Agreement, and each provision thereof, is a regional arrange- ment within the meaning of, and authorized by the International 49stat. 2391 2445;54 Telecommunications Convention and the General Radio Regulations Stat. 1417. annexed thereto. II TECHNICAL A. DEFINITIONS 1. Broadcast station. A station the emissions of which are primarily intended to be received by the general public. 2. Broadcast channels-550 to 1600 kc. A broadcast channel is a band of frequencies ten (10) kc in width, with the carrier frequency at the center. Channels shall be designated by their assigned carrier frequencies. Carrier frequencies assigned to broadcast stations shall begin at 550 kc and be in successive steps of 10 kc. No intermediate frequency shall be assigned as the carrier frequency of any broadcast station. 3. Service areas. (a) Primary service area. The primary service area of a broad- cast station is the area in which the ground wave is not subject to objectionable interference or objectionable fading. (b) Secondary service area. The secondary service area of a broad- cast station is the area served by the sky wave and not subject to objectionable interference. The signal is subject to intermittent variations in intensity. 4. Dominant stations. A "dominant" station is a Class I station, as hereinafter defined, operating on a clear channel. 5. Secondary station. A "secondary" station is any station except a Class I station operating on a clear channel. [55 STAT. TREATIES

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