Chapter XIII.
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Chap. XIII, art. 33 RR) (748–752) 748
(4)A ship station after establishing communication with another station of the maritime mobile service on the general calling frequency 143 kc/s must, so far as practicable, transmit its traffic on some other frequency in the authorized bands, provided that it does not disturb the work in progress at another station. 749 § 14.
(1)As a general rule, any ship station working in the bands 110 to 160 kc/s when it is not engaged in communication with other stations of the maritime mobile service must, during its hours of service, keep watch every hour on the frequency 143 kc/s for five minutes beginning at x h 35, Greenwich mean time (G.M.T.). 750
(2)The frequency 143 kc/s may be used for individual calls and will preferably be used for this purpose during the period indicated in 749. Section IV. Bands included between 1 605 and 2 850 kc/s 751 § 15. Except where regional agreements specify otherwise, the frequencies assigned to ship stations for radiotelegraph communication in the bands between 1 605 and 2 850 kc/s must, as far as possible, be harmonically related (subharmonics) to the frequencies assigned to ship stations in the 4 000 kc/s radiotelegraph band (see section V). Section V. Bands included between 4 000 and 23 000 kc/s *A.**General* 752 § 16.
(1)Mobile radiotelegraph stations equipped to operate in the frequency bands of the maritime mobile service between 4 000 and 23 000 kc/s must employ only class A1 emission. However, for radiocommunication of a special character, and for survival craft stations (see 600), the use of other classes of emission is not precluded. 63 Stat. 1864 (753–761) (
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