AP17 – 113 – PART B – Channelling arrangements (Rev.WRC-15)MOD Section I – Radiotelephony 1 Radiotelephone channelling arrangements for the frequencies to be used by coast and ship stations in the bands allocated to the maritime mobile service are indicated in the following Sub-Sections: Sub-Section A – Table of single-sideband transmitting frequencies (kHz) for duplex (two-frequency) operation; Sub-Section B – Table of single-sideband transmitting frequencies (kHz) for simplex (single-frequency) operation and for intership cross-band (two-frequency) operation; Sub-Section C-1 – Table of recommended single-sideband transmitting frequencies (kHz) for ship stations in the frequency band 4 000-4 063 kHz shared with the fixed service; Sub-Section C-2 – Table of recommended single-sideband transmitting frequencies (kHz) for ship and coast stations in the frequency band 8 100-8 195 kHz shared with the fixed service. 2 The technical characteristics for single-sideband transmitters specified in Recommendation ITU-R M.1173-1 shall be used. (WRC-15) 3 One or more series of frequencies from Sub-Section A (with the exception of those frequencies mentioned in § 5 below) may be assigned to each coast station, which uses these frequencies associated in pairs (see No. 52.226); each pair consists of a transmitting and a receiving frequency. The series shall be selected with due regard to the areas served and so as to avoid, as far as possible, harmful interference between the services of different coast stations. 4 The frequencies in Sub-Section B are provided for worldwide common use by ships of all categories, according to traffic requirements, for ship transmissions to coast stations and for intership communication. They are also authorized for worldwide common use for transmissions by coast stations (simplex operation) provided the peak envelope power does not exceed 1 kW. 5 The following frequencies in Sub-Section A are allocated for calling purposes: – Channel No. 421 in the 4 MHz band; – Channel No. 606 in the 6 MHz band; – Channel No. 821 in the 8 MHz band; – Channel No. 1221 in the 12 MHz band; – Channel No. 1621 in the 16 MHz band; – Channel No. 1806 in the 18 MHz band; – Channel No. 2221 in the 22 MHz band; – Channel No. 2510 in the 25 MHz band.