54 STAT.] MULTILATERAL-TELECOMMUNICATION-APR. 8 , 1938 by aural radiotelegraph reception, texts so transmitted. He can be replaced only by authorized persons possessing the same qualifications. [198] §4. Administrations shall take such measures as they judge necessary to verify, from a technical standpoint, the qualifications of any person operating the apparatus. [199] §5. (1) The maximum power which amateur stations and pri- vate experimental stations may use shall be fixed by the interested administrations, taking account of the technical qualifications of the operators and of the conditions under which the said stations must work. [200] (2) All the general rules laid down in the Convention and in the present Regulations shall apply to amateur stations and to private experimental stations. In particular, the frequency of the wave emitted must be as constant and as free from harmonics as the state of the art permits. [201] (3) In the course of their emissions, these stations must, at short intervals, transmit their call signals or, in the case of experi- mental stations not yet provided with call signals, their names. ARTICLE 9 Conditions to be Observed by Mobile Stations A. GENERAL [202] §1. Mobile stations must be established in such a way as to conform, as regards frequencies and types of waves, to the provisions forming the subject of article 7.* [203] §2. The frequency of emission of mobile stations shall be veri- fied as often as possible by the inspection service to which they are subject. [204] §3. Receiving apparatus must be such that the current which they induce into the antenna shall be as low as possible and shall not disturb neighboring stations. [205] §4. Transmitting and receiving sets of any mobile station must permit of making frequency changes as rapidly as possible. All installations must be such that, after the communication is estab- lished, the time necessary to change from transmission to reception and vice versa shall be as short as possible. [207] §5. For broadcasting of radiophone transmissions, see article 21, §1 (2) [No. 473]. B. SHIP STATIONS [208] §6. (1) The transmitting apparatus used in ship stations work- ing on type-A2 or -B waves in the authorized band between 365 and 515 kc (822 and 583 m) must be provided with devices making it possible conveniently and appreciably to reduce the power thereof. [206] *Regarding the restriction upon the installation of type-B wave transmit- ters and the use of type-B waves on ships, see article 7, §10, (1) to (3) [No. 161, 162, and 163]. 1475 General regulations. Ante, p. 1429. Podt, p . 1523. Ship stations.
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