i3 STATr. Mt LTILATERAITELECOM NIATICOMMN ONS-OCT. 2 , 1947 (Chapter XIII, art. 33 RR) (797-803) other must be the lowest frequency assignable in group B. If one of the frequencies assigned is the second frequency from the low frequency end of group A, then the other frequency assigned must be the second frequency from the low frequency end of group B, etc. 797 (4) Each administration shall assign successively one such pair of frequencies to each of its ship stations, commenc- ing at either end of the band. When all available working fre- quencies in a band have been assigned in this manner the proc- ess shall be repented as often as is necessary to satisfy all its requirements and to ensure a uniform distribution of assign- ments throughout the band. d) Abbreviations for the designation of working frequencies. 798 § 36. The following system of abbreviations may be used to designate working frequencies: 799 a) In the case of a working frequency included be- tween 4 000 and 23 000 kc/s, transmit the last three figures of the frequency excluding frac- ticns of a kilocycle; 800 b) When the calling station does not know the working frequencies of a cargo ship station, it may request the ship station to reply on its working frequency in group A or on its working frequency in group B by transmitting QSW A or QSW B as the case may be. Section VI. Aeronautical Mobile Service 801 § 37. Agreements between the interested governments may fix frequencies for call and reply in the aeronautical mo- bile service. These frequencies, as well as the conditions gov- erning their use, are listed in the service documents published by the Secretary General of the Union. 802 § 38. For the use of the frequency 500 kc/s for calling and distress purposes, see 711 to 723. 803 § 39. In regions 1 and 3, the frequency 333 kc/s is the general calling frequency for aircraft stations operating in the bands 325 - 405 kc/s. 1879
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