Chapter XIII.
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/statutes-at-large/vol-63/chapter-xiii-6540374·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
Chap. XIII, art. 33 RR) (740–747) Section III. Bands included between 90 and 160 kc/s *A.**Call and Reply.* 740 § 11.
(1)The frequency 143 kc/s (class A1 only) is the international calling frequency used in the maritime mobile service in the bands 90 to 160 kc/s. 741
(2)Apart from the frequency 143 kc/s, the use of any frequency between 140 and 146 kc/s is forbidden. 742 § 12. The frequency for replying to a call sent on the frequency 143 kc/s is: – for a ship station, the frequency 143 kc/s; – for a coast station, its normal working frequency. *B.**Traffic.* 743 § 13.
(1)The following rules must be observed by stations of the maritime mobile service using class A1 emissions in the bands 90 to 160 kc/s: 744
(2)*a)* Every coast station must keep watch on the frequency 143 kc/s unless the List of Coast and Ship Stations provides otherwise. 715 *b)* The coast station transmits its traffic on the working frequency or frequencies specially assigned to it. 746
(3)*a)* When a ship station desires to establish communication with another station of the maritime mobile service, it must use the frequency 143 kc/s, unless the List of Coast and Ship Stations provides otherwise. 747 *b)* This frequency must be used exclusively: – for individual calls and replies to such calls; – for the transmission of signals preparatory to traffic. 63 Stat. 1862 (748–752) (
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