Page:United States Statutes at Large Volume 49 Part 2.djvu/485

 TELECOMMUNICATION CONVENTION. DECEMBER 9, 1932. 2501 ARTICLE 16 General Radiotelegraph Procedure in the Mobile Service 1 2 [243] § 1. (1) In the mobile service, the following detailed procedure ~;15:17, 19 November 2014 (UTC)~'f:; shall be obligatory except in the case of distress call or traffic to which mc:!T,S;TarmstroBot (talk) 15:17, 19 November 2014 (UTC): the provisions of article 22 shall apply. [U4] (2) For the exchange of radio communications, stations Post, p. 2ti19. of the mobile service shall use the abbreviations given in appendix 9. (2'5] § 2. (1) Before transmitting, any station must make sure that it will not produce harmful interference with the transmissions being made within its range; if such interference is likely, the station shall await the first stop in the transmission which it may disturb. (~6] (2) If however, even after taking these precautions, the emissions of this station should cause interference with a radio trans- mission already in progress, the following rules shall be applied: [247] (a) In the communication zone of a land station open to the public correspondence service or of any aeronautical station, the station whose emission produces the interference must cease transmitting at the first request of the above-mentioned land or aeronautical station. [268] (b) In the case where a radio transmission already in progress between two ships happens to be interfered with by an emis- sion from another ship, the latter must cease transmitting at the first request of either of the other two. [~49] (c) The station requesting this cessation must indicate the approximate length of the wait imposed upon the station whose emission it is suspending. [250] § 3. Radiotelegrams of all kinds transmitted by ship stations shall be numbered in daily series, assigning number 1 to the first radio- telegram transmitted each day to each land station separately. [251] § 4. CALLING A STATION AND SIGNALS PREPARATORY TO TRAFFIC [262] (1) Method of caUing The call shall consist of the following: not more than three times the call sicrnal of the station called'. ('alling a station and ao~, sIgnals preparatory to the word DE; traffic. not more than three times the call signal of the calling station. F'63] (2) Wave to be medfor the caU and for preparatory signals To make the call as well as to transmit preparatory signals the calling station shall use the wave on which the station called is listening. 1 This procedure shall be applicable to short waves so far as possible. I The provisions of §§ 2 and 8 sha.ll be applicable to radiotelephone tranamie-- sions of the mobile service.