Page:United States Statutes at Large Volume 45 Part 2.djvu/1181

 INTERNATIONAL RADIO CONVENTION. NOVEM.BER 25,1927. §8. The interested Governments shall take the necessary steps so that certificates issued under former regulations shall remain valid for the holders of those certificates who are able generally to meet the new requirements for issue. §9. The provisions of the present Article shall become obligatory not later than three years after the present Regulations become effective. ARTICLE 8 . Authority of the master §1. The radio service of a mobile station shall be placed under the supreme authority of the master or of the person responsible for the vessel, aircraft, or other mobile station. §2. The master or person responsible, as well as all persons who may have knowledge of the text or simply of the existence of radio tele- grams, or of any informf!,tion whatever obtained by means of the radio service, shall be bound to maintain and ensure the secrecy of correspondence. ARTICLE 9 General procMure in the mobile seme §l. In the mobile service, the following detailed procedure shall be obligatory, except in the case of distress calls or of distress corre- spondence, to which the provisions of Article 19 are applicable. §2. (1) Before proceeding with a transmission, the sending station must make sure that no excessive interference will be caused to other communications in progress within its range on the frequency to be used; if there is probablity of such interference occurnn~, it shall await the first break in the transmission with which it nught interfere. (2) If, in spite of this precaution, a radio transmission in progress is interrupted by the call, the latter must cease at the first request of a land station open to the international service of public corre- spondence or by any aeronautical station whatsoever. The station requesting this cessation must indicate the approximate duration of the suspension imposed upon the station whose call has been stopped. §3. In mobile service radiotelegraph correspondence the following procedure shall be used for calling a station: (1) (a) The calling station shall make the call by transmitting not more than three times the call signal of the station called and the word DE, followed not more than three times by its own call signal. (b) In making this call the calling station shall use the wave on which the station called keeps watch. (2) The station called shall reply by transmitting not more than three times the call signal of the calling station, the word DE, its own call signal, and, if it is ready to receive traffic, the letter K (invitation to transmit), followed if deemed useful, by the appropriate abbrevia- tion and by a number indicating the strength of the signals received. (3) If the station called is unable to receive, it shall replace in the reply formula the letter K by the signal. _ ••• (wait), followed by a number indicating in minutes the probable duration of the wait. If it is probable that this delay will exceed ten minutes, the delay must be explained. (4) When there are several radiotelegrams to be transmitted in the same direction, they may be transmitted in series with the consent of the station which is to receive them. (5) This latter station, in giving its consent, shall indicate the number of radiotelegrams which it is ready to receive in a series, and this indication shall be followed by the letter K. 2857 Authority 01 master. General procOOnfe In the mobile service. POll, p. 2869.

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