63 STAT.] AIULTILATERAL-TELECOMMININICATIO)NS-OCT. 2 , 1947 (Chapter XIII, art. 28 RR) (573-581) ARTICLE 28 Conditions To Be Observed by Mobile Stations Section I. General Provisions 573 § 1. (1) Mobile stations must be established in such a way as to conform as regards frequencies and class of emission to the provisions of chapter III. 574 (2) For the use of class B emissions on board ships, see 711. 575 §2. The frequencies of emission of mobile stations shall be checked as often as possible by the inspection service to which these stations are subject. 576 §3. The energy radiated by receiving apparatus must be reduced to the lowest possible value and must not cause harm- ful interference to other stations. 577 § 4. (1) Changes of frequency in the sending and receiving apparatus of any mobile station must be capable of being made as rapidly as possible. 578 (2) Installations of any mobile station must permit, once communication is established, of changing from transmission to reception and vice-versa in as short a time as possible. 579 §5. Broadcasting by mobile stations at sea and over the sea is prohibited. 580 §6. Mobile stations must be provided with the service documents enumerated in appendix 8. Section II. Ship Stations 581 §7. When the ship transmitter itself cannot be con- trolled in such a way that its frequency satisfies the tolerance specified in appendix 3, the ship station must be provided with a device, having a precision at least equal to one-half of this tolerance, for measuring the frequency of emission. 81939 O-52 -PT. II 1819 -34
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