Page:United States Statutes at Large Volume 49 Part 2.djvu/513

 TELECOMMUNICATION CONVENTION. DECEMBER 9,1932. 2529 F. DISTRESS TRAFFIC [8"] § 12. Distress traffic shall include all messages relative to im- Distress traffic. mediate assistance needed by the mobile station in distress. [397] § 13. Every distress traffic radiotelegram must include the dis- tress signal transmitted at the beginning of the preamble. [398] § 14. The control of distress traffic shall devolve upon the mobile station in distress or upon the mobile station which, by application of the provisions of § 10 (a), has sent the distress call. These stations may delegate the control of the distress traffic to another station. [39'.1] § 15. (1) When it considers it indispensable, any station of the mobile service in the proximity of the ship, aircraft, or vehicle in distress, may impose silence either to all the stations of the mobile service in the zone, or to anyone station which may be causing inter- ference with the distress traffic. In both cases, the regulatory abbre- viation (QRT) shall be used, followed by the word DISTRESS; these indications shall be addressed" to all" stations or to one station only, as the case may be. [400] (2) When the station in distress wishes to impose silence, it shall use the above-mentioned procedure, substituting the distress signal •• • --_ •• • for the word DISTRESS. [401] § 16. (1) Any station hearing a distress call must conform to the provisions of § 5 (4). [402] (2) Any station of the mobile service Which becomes aware of distress traffic must listen to this traffic even if it is not taking part in it. l403J (3) For the entire duration of distress traffic, it shall be prohibited for all stations which are aware of this traffic and which are not taking part in it: [404J (a) to use the distress wave [500 kc (600 m)] or the wave on which the distress traffic is taking place; [405] (b) to use type-B waves. [406] (4) A station of the mobile service which, while follow- ing distress traffic of which it is aware, is able to continue its normal service, may do so, when the distress traffic is well established, under the following conditions: [407] (a) the use of the waves specified in (3) shall be for- bidden; [408] (b) the use of type-AI waves, with the exception of those which might interfere with the distress traffic, shall be permitted; [409] (c) it shall be allowed to use type-A2 or -A3 waves only in the band or bands allocated to the mobile service and which do not include frequencies used for distress traffic [the band around 500 kc (600 m) extends from 385 to 550 kc (779 to 545 m)]. [410] § 17. When it is no longer necessary to observe silence, or when the distress traffic is ended, the station which has controlled this traffic shall send on the distress wave, and, where necessary, on the