Chapter XIII.
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Chap. XIII, art. 33 RR) (734–739) international distress frequency 500 kc/s for three minutes twice an hour beginning at x h 15 and x h 45, Greenwich mean time (G.M.T.). 734
(2)During the periods mentioned above, except for the emissions provided for in article 37 (see 934 to 949): 735 *a)* transmissions must cease within the bands 485 to 515 kc/s; 736 *b)* outside this band, transmissions of stations of the mobile service may continue; stations of the maritime mobile service may listen to these transmissions on the express conditions that they first ensure watch on the distress frequency as provided by 733. 737 § 10.
(1)Stations of the maritime mobile service open to public correspondence and using frequencies in the authorized bands between 405 and 535 kc/s must, during their hours of service, remain on watch on the calling frequency 500 kc/s. This watch is obligatory only for class A2 emissions. 738
(2)These stations, while observing the provisions of 733, are authorized to relinquish this watch only when they are engaged in communication on other frequencies. 739
(3)When they are engaged in such communications: – Ship stations may maintain this watch by means of an operator, a loudspeaker, or by some other appropriate means such as an automatic alarm receiver. – Coast stations may maintain this watch either by means of an operator or by loudspeaker; in the latter case an indication may be inserted in the List of Coast and Ship Stations. 63 Stat. 1860 (740–747) (
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