1416 INTERNATIONAL AGREEMENTS OTHER THAN TREATIES [55 STAT. ASSIGNMENTS OF BROADCASTING STATIONS IN MEXICO LISTED BY FREQUENCIES-Continued CALL RADIA- LETTER LOCATION POWER TION CLASS 660 kilocycek XEBZ Mexico, D.F . 500 DA II Class II assignment with 500 watts in Mexico, D.F., on the clear channel 660 kilocycles, occupied by WEAF, a Class I-A station in the United States, acceptable subject to directional antenna to protect the border of the United States in accordance with the engineering standards of the Treaty. It is recognized, under Part II, Section F, of the North American Regional Broadcasting Agree- ment, that "the engineering standards set forth in this Agreement are subject to revision when justified by technical advances in the art" and that advances in the art of designing directional antennas permit reduction of the safety distance of 650 miles provided by Part II, C, Article 4 (b) of the Agreement to 400 miles when the propagation will take place over mountainous regions near the station and will not take place over seawater or along ideal paths between the Class II station and border of the country to which the Class I-A station on the channel is assigned, and when the most modern engineering development of antenna design and antenna control are utilized to avoid and prevent interference. Accordingly, the United States, in spite of its priority and other rights of use for a Class I-A station on this frequency, agrees to this revision of the safety distance of 660 miles provided by Part II, C, Article 4 (b) solely for stations installed in Mexico City anditscon- tiguous area, it being understood that the permissible interfering signal from such Mexican stations shall not at any time exceed the values specified in Table I of Appendix II of the Agreement and that the United States may at any future time exercise its other rights under the Agreement with respect to the use of this frequency, without regard to any priorities resulting from the establish- ment of such Mexican stations. 670 kilocycles 680 kilocycles XED Guadalajara, Jal. 1000 DA II 690 kilocyecs XEN Mexico, D.F . 5000 II XEAC Tijuana, B.C. 5000 II This assignment is accepted by Canada subject to a directional antenna if objectionable inter ference exists east of North Dakota on the Canadian border at night. 700 kilocycles 710 kilocycles 7?O kilocycles 730 kilocycles XEl)P Mexico, D.F. 15000I-A 74(0kilocycles 760 kilocycles 760 kilocycles 770 kilocycles 780 kilocycles 71 kiilocycles XER.C Mexico, D.F. 1000 II-A XELJ N. Laredo, Tams. II-B 800 kilocycle Nogales, Son. 100 I-A 810 kilocycles XE*FV Tampico, Tams. A 1 80 kilocycles 830 kilocyclea XF.LA Mexico, D.F. 1000 Class 1 assignment with I kilowatt in Mexico, D. F., on the clear channel 830 kilocycles, occupied by WCCO, a Class I-A station in the United States, acceptable subject to directional antenna to protect the border of the United States in accordance with the engineering standards of the Treaty. See note reference XEBZ, 660 kilocycles. 840 kilocycles 860 kilocyles
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