Page:United States Statutes at Large Volume 63 Part 2.djvu/500

 63 STAT.] -MULTILATERAL-TELECOMMUNICATIONS-OCT. 2, 1947 (Chapter XI, art. 24 RR) (50-iO-13 Section IL Classes and Categories of Certificates 509 § 5. (1) There are two classes of certificates, as well as a special certificate, for radiotelegraph operators.') 510 (2) There are two categories of certificates (general and restricted) for radiotelephone operators.') 511 § 6. (1) The holder of a first or second class radiotelegraph operator's certificate, may perform the service of any ship or aircraft radiotelephone station. 512 (2) The holder of a general radiotelephone operator's certificate may carry out the service of any ship or aircraft station when the installation is used solely for telephony, pro- vided that: - the power in the antenna of the unmodulated carrier wave does not exceed 100 watts; - or, the power in the antenna of the unmodulated carrier wave does not exceed 500 watts in cases where the operation of the transmitter requires only the use of simple external switching devices excluding all manual adjustment of frequency de- termining elements. Moreover, the stability of these frequencies must be maintained by the transmitter itself within the limits of tolerance specified by appendix 3. 513 (3) The holder of a radiotelephone operator's restricted certificate may carry out the service of any ship or aircraft station when the installation is used solely for telephony pro- vided that: - the power in the antenna of the unmodulated carrier wave does not exceed 50 watts; - or, the power in the antenna of the unmodulated carrier wave does not exceed 250 watts in cases where the operation of the transmitter requires only the use of simple external switching devices excluding all manual adjustment of frequency 509.1 & 510.1 " As regards the employment of operators holders of the differ- ent certificates, see article 25. 1797

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