63 STAT.] MUILTILIATERAI-TELECOMMUNICATIONS-OCT. 2 , 1947 (Chapter XIIL art. 34 RR) (W-40S) 2182 kc/s twice each hour for three minutes commeneing at x h 00 and x h 30, Greenwich mean time. (G.M.T .) . 827 (4) During the above-mentioned intervals, all trans- missions in the bands between 2 167 and 2 197 kc/s, except distress, urgency and safety transmissions, must cease. Section IL Frequency Bands between 4 000 kc/s and 23 000 kc/a 828 § 13. (1) The provisions of this section are applicable to the radiotelephone service between coast stations and ship sta- tions in the frequency bands allocated for this purpose to the maritime mobile service between 4 000 and 23 000 kc/s. 829 (2) In duplex telephony, the frequencies of emission of coast stations and of the corresponding ship stations shall be selected, as far as possible, by pairs as indicated in appen- dix 12. Section IV. Frequency Band 152-162 Mc/s 830 § 14. (1) The frequency 156.80 Mc/s is the frequency de- signated for world-wide use on a simplex basis in the maritime mobile service for calling, safety, intership and harbour con- trol purposes. 531 (2) The administrations concerned will take the neces- sary steps, by special arrangements if necessary, to reserve a suitablguard-band for this frequency. 532 (3) The frequency 166.80 Mc/s must not be used for purposes other than those defined in 830 in areas where such other use is liable to cause harmful interference to the maritime mobile service. R33 § 15. The use of frequency modulation is compulsory in Region 2 and its use is strongly recommended in other regions. 1887
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