TELECOMMUNICATION CONVENTION. DECEMBER 9, 1932. 2481  § 7. (1) In addition to the waves mentioned above, ship stations equipped to transmit type-AI, -A2, or -A3 waves may use the waves authorized in article 7. (143] (2) The use of type-B waves shall be prohibited on all frequencies, except the following ones: 375 kc (800 m) 410 kc (730 m) 425 kc (705 m) 454 kc (660 m) 500 kc (600 m) 1,364 kc (220 m) * [1"] § 8. All the ship station apparatus installed for the transmission of type-AI waves in the authorized band between 100 and 160 kc (3,000 and 1,875 m) must permit of using at least two frequencies, selected in this band, in addition to the frequency of 143 kc (2,100 m). (1<46] § 9. (1) All stations on board ships compulsorily provided with radiotelegraph apparatus must be capable of receiving the wave of 500 kc (600 m) and, in addition, all the waves necessary to the opera- tion of the service which they carry on.  (2) These stations must be capable of receiving types Al and A2 waves on the same frequencies easily and efficiently. C. AIRCRAFT STATIONS [H7] § 10. (1) (a) Any station installed on board an aircraft flying Air<T8ftstatioDS. over a maritime route, and compulsorily provided with radio apparatus as the result of an international agreement, must be capable of trans- mitting and receiving on the wave of 500 kc (600 m), type A2 or B.  (b) As regards the restriction in the use of type-B waves, see B, § 7 (2) above.  (2) (a) Any aircraft station must be capable of trans- mitting and receiving the wave of 333 kc (900 m), type A2 or A3.  (b) This rule shall not apply to aircraft stations flying over regions where local agreemellts providing otherwise are in force. ARTICLE 10 Operators' Oertijicates A. GENERAL PROVISIONS Opera tors' certifl· cates. (161) § 1. (1) The service of every mobile radiotelegraph or radio- General provisions. telephone station must be performed by a radiotelegraph operator holding a certificate issued by the government to which the station is subject. However, in mobile stations equipped with a low-power radio installation [power of the carrier wave in the antenna not ex- ceeding 100 watts, except in the case of regional agreements provided
- See note (10) to the frequency allocation table.