portions of the orbit": 75°W to 100°W longitude (however, for service to Canada the USA and Mexico, the elevated portion shall be only between 75°W and 95°W longitude); 140°W to 170°W longitude. The article also provides that space stations in both the broadcastingsatellite service and in the fixed-satellite service may be located in specified orbital areas. Such space systems in the 11.7 - 12.2 GHz frequency band are to use "to the maximum extent technically and economically practicable, available techniques in order to make the most efficient use of the geostationary orbit and the frequency spectrum." Article 13 deals with the approval of the Final Acts. Article 14 contains a promise of the ITU membership to "endeavor to agree on the action required to reduce harmful interference which might be caused by the application of these provisions and the associated plan." Article 15 states that the Final Acts are to enter into force on January 1, 1979. This date has to be weighed against the fact that the WARC to be held in 1979 is to be asked to incorporate the Final Acts into the Radio Regulations as an integral part of them. Article 16 asserts that the provisions and the associated "Plan" have been designed for the future and that the agreement should be binding for a period of 15 years or until revised by a duly constituted Administrative Radio Conference. Annex 1 to the Final Acts of the 1977 Conference sets criteria to be used in determining whether a service is considered to be affected by a proposed modification of the "Plan." Annex 2 specifies the basic characteristics to be furnished in notices relating to space stations in
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