Page:United States Statutes at Large Volume 54 Part 2.djvu/247

 54 STAT.] MULTILATERAL-TELEOMMUNICATION-APR. 8, 1938 1467 [156] Remark 1. Except as indicated in Notes (a) and (b) [Nos. 154 and 1551], aeronautical and aircraft stations using frequencies on the routes to which they are assigned shall have priority over all other services. [157] Remark 2. The frequencies assigned to the intercontinental routes indi- cated shall be available to the aeronautical services of all countries using these routes. Users of the frequencies shall cooperate concerning the operation of stations so as to avoid mutual interference. [158] Remark S. Type-Al emissions only may be used on the intercontinental routes. [159] Remark 4. In the European region, the U.S.S.R ., Africa, and South Amer- ica, the bands mentioned in the table in §9 (a) of this article [No. 150] may be used Ante, p. 1459. exclusively for the aeronautical service, subject to the priority specified in Remark 1 above. [No. 156]. These bands may also be used in other regions for aeronautical services, exclusively or not, subject to the conditions contained in Remark 1. [No. 156]. [160] Remark 5. In the European region, that part of the mobile bands between 6,000 and 25,000 kc (50 and 12 m) which is not exclusively allocated to the aeronautical services shall remain assigned exclusively to the maritime mobile services, except for the general calling-wave for aeronautical stations 6,210 kc (48.31 m). However, aeronautical mobile stations may carry on their pub- lic correspondence with coast stations in the bands of the maritime mobile serv- ices, in accordance with agreements to be made between the administrations concerned. [161] §10. (1) The use of type-B waves shall be forbidden in all T-Bwaves. radio stations. As an exception, it shall be permitted in ship stations on the following frequencies: 375 kc (800 m) radio direction-finding only, 425 kc (706 m) traffic, 500 kc (600 m). [162] (2) The use of type-B waves on all frequencies shall be pro- hibited, beginning January 1, 1940, except for ship transmitters which, when working at full power, shall use less than 300 watts measured at the terminals of the alternator. [163] (3) The administrations shall endeavor to abandon as soon as possible type-B waves other than the 500-kc (600-m) wave. [164] §11. (1) In regions of intense traffic on the coasts of Europe, ship stations operating on type-A2 waves in the range of 365 to 550 kc (822-545 m) must, so far as possible, use the frequencies of 425 ke (706 m) and of 480 kc (625 m). [165] (2) No European coast station is authorized to use these frequencies. [166] §12. The use of type-Al waves only shall be authorized be- tween 100 and 160 kc (3,000 and 1,875 m); the only exception to this rule shall be for type-A2 waves which may be used in the band 100 to 125 kc (3,000 to 2,400 m) for time signals exclusively.

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