Page:United States Statutes at Large Volume 63 Part 2.djvu/576

 ;i3 STAT. I M 'LTIIATEItAIOTELLECOMMt'Nl('ATIONS--OCT. 2, 1947 (Chapter XIII, art. 33 RR) (780-75) the use of aircraft desiring to communicate with stations of the maritime mobile service. These frequencies are the fol- lowing: 4 182; 6 273; 8 364; 12 546; 16 728 and 22 245 kc/s. 780 (2) The frequency 8 364 kc/s must be used by lifeboats, liferafts and other survival craft, if they are equipped to trans- mit on frequencies between 4 000 and 23 000 kc/s, and if they desire to establish with stations of the maritime mobile ser- vice communications relating to search and rescue operations see (600). 2. Working Frequencies of Mobile Stations a) General. 781 § 29. (1) The working frequencies for passenger ships are so spaced as to provide clear channels. In the 4 000 kc/s band, the two channels adjacent to the calling band are 5 kc/s wide and the remainder are 2.5 kc/s wide, the extreme frequencies assignable being 4 135 and 4 175 kc/s as indicated in appendix 10. 782 (2) In the 4 000 kc/s band, the working frequencies of cargo ships are spaced 0.5 kc/s apart,-the extreme frequencies assignable being 4 188 and 4 236.5 kc/s as indicated in ap- pendix 10. 783 (3) The working frequencies assigned to each ship station in the 6000, 8000, 12000 and 16000 kc/s bands must be harmonically related to those assigned in the 4 000 kc/s band. 784 (4) In the case of the 22 000 kc/s band, which is not in harmonic relationship with the other bands, the frequencies are spaced as follows and indicated in appendix 10: 785 a) in the passenger ship band the two channels ad- jacent to the calling band are 20 kc/s wide and the remaining channels are 10 kc/s wide, the extreme frequencies assignable being 22 075 and 22 215 kc/s;

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