Chapter XIII.
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Chap. XIII, art. 28 RR) (592–598) working frequencies in addition to one frequency in the calling band; 592 *b)* changes of frequency in transmitting apparatus must be effected within 5
(five)seconds if the frequencies are in the same band and within 15 (fifteen) seconds if the frequencies are in different bands; 593 *c)* receiving apparatus must be capable of a performance equal to that of the transmitting apparatus in the matter of frequency changing and must be designed in such a manner so as to ensure a satisfactory performance; 594 *d)* the provisions of 592 and 593 above shall become effective on the same dates as the tolerance requirements of column 3 of appendix 3 as applied to ship and aircraft stations. 595 § 13.
(1)Stations in ships compulsorily equipped with radiotelegraph apparatus must be able to receive, in addition to 500 kc/s, all the frequencies necessary for their service. 596
(2)Such stations must be able to receive easily and efficiently on the same frequencies class A1 and A2 emissions. 597
(3)Ship radiotelegraph stations shall be equipped as soon as possible with devices permitting change-over from transmission to reception and vice-versa without manual switching. Section III. Aircraft Stations 598 § 14.
(1)Any aircraft station following a maritime course and required by national or international regulations to communicate, for safety purposes, with stations of the maritime mobile service, must be capable of transmitting and receiving on the frequency 500 kc/s, preferably class A2 emission. 63 Stat. 1824 (599–603) (
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