Page:United States Statutes at Large Volume 49 Part 2.djvu/545

 TELECOMMUNICATION CONVENTION. DECEMBER 9, 1932. 2561 C. SERVICE OF RADIO DIRECTION-FINDING STATIONS [638] § 9 The administrations to which radio direction-finding sta-. Radi<! direction-find- • mg stations. tions are subject accept no responsibility for the consequences of an inexact bearing. [637] § 10. These administrations shall notify, for insertion in the nomenclature of stations carrying on special services, the characteris- tics of each radio direction-finding station, indicating for each one the sectors in which bearings are normally safe. Any change concerning this information must be published without delay; if the change is of a permanent nature, it must be communicated to the Bureau of the Union. [1138] § 11. (1) The normal radio direction-finding wave shall be the wave of 375 kc (800 m). In principle, all coastal radio direction- finding stations must be able to use it. 1 In addition, they must be able to take bearings from emissions made on 500 kc (600 m), particu- larly to locate distress, alarm, and urgent signals. l~311] (2) An aircraft station desiring to obtain its bearing must, in order to request same, call on the 333-kc (900-m) wave or on a wave assigned to the air route over which it is flying. Where an aircraft station, while in the vicinity of coast stations, calls them in order to obtain a bearing, it must usc the watch frequency of these coast stations. [640] § 12. The procedure to be followed in the radio direction-finding l'ro(1'dw' F'fJ,vf,l ' . :!/;;.1, service is given in appendix 13. D. RADIOBEACON SERVICE [6061] § 13. (1) When an administration deems it advisable, in the Radiobeacon sen'j(-(l. interests of maritime and aerial navigation, to organize a radiobeacon service, it may use for this purpose: [542] (a) radiobeacons proper, established on land or on vessels permanently moored; the emissions of these radiobeacons may be either nondirectional or directional; [6063] (b) fixed stations, coast stations, or aeronautical stations designated to function also as radiobeacons, upon request of mobile stations. [""] (2) Radiobeacons proper shall use the following waves: [Ma] (a) In the European region, for the maritime radio- beacons, the waves of the band 290 to 320 kc (1,034 to 938 m) and, for the aeronautical radiobeacons the waves of the band 350 to 365 kc (857 to 822 m), as well as certain waves of the band 255 to 290 kc (1,176 to 1,034 m),selected byintemational aeronautical organizations. 1 It is recognized that certain existing stations are not able to use this wave, but all new stations must be able to take bearings on 375 kc (800 m) and on 600 kc (600 m).