RES207 – 276 – instructs the Radiocommunication Bureau 1 to seek the cooperation of administrations in identifying the sources of those emissions by all available means and in securing the cessation of those emissions; 2 when the station of another service transmitting in a frequency band allocated to the maritime mobile service or to the aeronautical mobile (R) service has been identified, to inform the administration concerned; 3 to include the problem of interference to maritime and aeronautical distress and safety channels on the agenda of relevant regional radiocommunication seminars, instructs the Secretary-General to bring this Resolution to the attention of the International Maritime Organization and the International Civil Aviation Organization for such actions as they may consider appropriate. ANNEX TO RESOLUTION 207 (REV.WRC-15) Interference mitigation techniques This Annex lists several possible HF interference mitigation techniques that may be used, either in combination or singly, depending on the resources of administrations. Use of any or all of these techniques is not mandatory. 1 Alternative modulation methods The use of digitally modulated emissions, such as QPSK, to replace or supplement analogue SSB voice (J3E) and data (J2B) emissions. This initiative would need to be adopted internationally to allow the interoperability of equipment. For example, ICAO has adopted an HF data-link standard to provide packet data communications using automated link establishment and adaptive frequency control techniques as a supplement to analogue SSB voice communications (see ICAO Convention, Annex 10). 2 Passive and active/adaptive antenna systems Use of passive and active/adaptive antenna systems to reject unwanted signals. 3 Channel barring Administrations should ensure through their licensing, equipment standardization and inspection arrangements that, in compliance with No. 43.1, HF radio equipment cannot transmit on frequencies exclusively allocated to the aeronautical mobile (R) service, as detailed in Appendix 27, except for frequencies allocated for worldwide use and shared with the aeronautical mobile (OR) service (see Appendix 26/3.4).