Page:United States Statutes at Large Volume 45 Part 2.djvu/1189

 INTERNATIONAL RADIO CONVENTION. NOVEMBER 25,1927. §2. The call signals shall consist of: (a) Three letters in the case of fixed and land stations; (b) four letters in the case of ship stations; (c) five letters in the case of aircraft stations; (d) the letter or letters indicating the nationality and a single figure followed by a group of not more than three letters, for private eX{>erimental stations. §3. In the aircraft radio service, after communication has been es- tablished by means of the five-letter calling signal the aircrdt station may employ an abbreviated signal composed of: (a) In radiotelegraphy, the first and last letters of the complete five- letter signal. (b) In radiotelephony, all or part of the name of the owner of the aircraft (company or individual) followed by the two last letters of the registration mark. §4. (1) The twenty-six letters of the alphabet may be used to form call signals; accented letters are excluded. (2) The following combinations of letters, however, may not be used as call signals: (a) Combinations beginning with A or B, these two letters being reserved for the geographical portion of the International Code of Signals. (b) Combinations which might be confused with distress signals or with other signals of the same nature. (c) Combinations reserved for the abbreviations to be used in radio transmissions. (d) With reference to aircraft stations, combinations including the letter Was the second letter. §5. (1) Each country shall select the call signals of its stations from the international series assigned to it and shall inform the Interna- tional Bureau of the call signal assigned to each of them. (2) The International Bureau shall ensure that the same call signal is not adopted by more than one station and that the call signals which could be Illlstaken for distress signals or other signals of similar nature are not allotted to any station. ARTICLE 15 Inspection of stations §1. Mobile stations having their port of registry in a colony, posses- sion or protectorate may be considered as subject to the authority of such colony, possession or protectorate, as regards the granting of licenses. §2. The duly authorized Administrations of the countries where a mobile station calls may demand the production of the license' this must be kept in such a way that it may be produced without. delay. Where the license is not produced or when manifest irregularities are detected, these Administrations may proceed to the inspection of the radio installations in order to be assured that they satisfy the condi- tions imposed by the present Regulations. §3. (1) When an Administration has found it necessary to pursue the course indicated in section 2 above, it shall immediately so inform the Administration to which the mobile station in question is subject. In addition to this, the procedure specified in Article 12 is followed when necessary. (2) The official of the Administration who has inspected the station must, before leaving it, make known his findings to the Master or to the person responsible (Article 8) or to their representative. 2865 Call lfInal requIre- ments. Inspection of atatloll&

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