INTERNATIONAL AGREEMENTS OTHER THAN TREATIES [55 STAT. ARTICLE 2 Amateurs (Allocation of Amateur bands) (1) In conformity with the provisions of Article 7 of the General 54 Stat. 1429. Radio Regulations (Cairo Revision, 1938), the following bands shall be assigned to amateurs: a) 1750-2050 kc in the Northern zone and the central zone (excluding the countries in South America to the south of Panama. b) 1715-2000 kc in the Southern zone and the countries of South America to the south of Panama. c) 3500-4000 kc for all signatory countries of the American Continent. d) 7000-7300 kc for all signatory countries of the American Continent. e) 14000-14400 kc for all signatory countries of the American Continent. f) 28000-30000 kc for all signatory countries of the American Continent. g) 56000-60000 kc for all signatory countries of the American Continent. ARTICLE 3 Use of the Frequency 500 kc. With reference to the provisions of Article 21, Section 4, Par. (3) 64Stat.1526. (Nos. 485, 486) of the General Radio Regulations (Cairo Revision, 1938), all of the American Continent with the exception of Hudson Bay and the region to the north thereof shall be considered a region of heavy traffic. The use of the frequency 500 kc shall be limited, in consequence, to danger signals, urgency calls, the requirements of safety, calls and answers thereto and the transmission of brief and single radiotelegrams. ARTICLE 4. Frequency Tolerances (1) Technical progress in the matter of frequency stabilization is such that it is possible for all stations to keep themselves within the tolerances specified in Appendix 1 to the General Radio Regulations 54 Stat. 1589. of Cairo. (Table of Frequency Tolerances); (2) The Table of Frequency Tolerances of the General Radio Regulations is adopted; (3) The Administrations will promote through their responsible centers the fullest exchange of information concerning stations deviat- ing excessively from their assigned frequency; such data to be trans- mitted with the greatest possible expedition in order that immediate corrective measures may be undertaken while the transmitting ap- paratus is in difficulty. (4) As between the countries of South America, the interchange of data shall be carried out in accordance with the provisions of the South American Radiocommunications Agreement. 1486
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