54 STAT.] MULTILATERAL-TELECOMMUNICATION-APR. 8, 1938 1481 [228] (2) The conditions to be required for obtaining these certifi- cates are contained in the following paragraphs; they shall be minimum requirements. [229] (3) Each government shall be free to fix 'tne number of examinations deemed necessary to obtain the said certificates. [230] (4) The holder of a first- or second-class' radiotelegraph operator's certificate may perform the radiotelephone service of any mobile station. B. FIRST-CLASS RADIOTELEGRAPH OPERATOR'S CERTIFICATE [232] §4. The first-class certificate shall be issued to operators who First-class certifi- have shown that they possess the professional and technical quali- fications enumerated below: [233] (a) Knowledge of the general principles of electricity and of the theory of radiotelegraphy and radiotelephony, as well as knowledge of the adjustment and of the practical operation of the types of apparatus used in the radiotel- egraph and radiotelephone mobile service, including ap- paratus for radio direction-finding and the taking of radio direction-finding bearings. [234] (b) The theoretical and practical knowledge of the operation of the accessory apparatus, such as motor-generator sets, storage batteries, et cetera, used in the operation and adjustment of the apparatus specified in (a) [No. 233]. [235] (c) The practical knowledge necessary to make, with the means on board, the repairs of damage which may have oc- curred to the apparatus during a voyage. [236] (d) Ability to transmit correctly and to receive correctly, by ear, code groups (mixtures of letters, figures, and punc- tuation marks) at a speed of 20 (twenty) groups per minute, and of a text in plain language, at a speed of 25 (twenty-five) words per minute. Each code group must contain 5 characters, each figure or punctuation mark counting as 2 characters. The average word of the text in plain language must contain 5 characters. The dura- tion of each sending and receiving test shall, as a rule, be 5 minutes. [237] (e) Ability to perform correct telephone transmission and cor- rect telephone reception. [238] (f) Detailed knowledge of the Regulations applying to the exchange of radio communications, knowledge of docu- ments relative to charges for radio communications, knowledge of the radiotelegraph part of the Convention for the Safety of Life at Sea, and, in the case of aerial navigation, knowledge of the special provisions regulat- ing the radio service of aerial navigation. In that case, the certificate shall stipulate that the holder has suc- cessfully passed the examinations dealing with these provisions. [2311 1 In exceptional cases, the second-class certificate may be limited exclu- sively to the radiotelegraph service. In this case, mention of the fact must be borne on this certificate.
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