The Recommendation describes the technical characteristics of VHF radiotelephone transmitters and receivers (or
transceivers) used in the maritime mobile service when operating in 25 kHz channels of Appendix S 18 [Appendix 181 of the Radio Regulations (R
ITU-R M.489-2-1995 history
1995ITU-R M.489-2-1995 Technical Characteristics of VHF Radiotelephone Equipment Operating in the Maritime Mobile Service in Channels Spaced by 25 kHz