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RR9.18 applies to any transmitting station of a terrestrial service in frequency bands above 100 MHz allocated with equal rights to space and terrestrial services within the coordination area of an earth station, in respect of this earth station, with the exception of the coordination under RR9.16 and RR9.19.
RR9.19 applies to any transmitting station of a terrestrial service in a frequency band shared on an equal primary basis with the broadcasting-satellite service, with respect to typical earth stations included in the service area of a space station in the broadcasting-satellite service.
It applies to any station of a service for which the requirement to seek the agreement of other administrations is included in a footnote to the Table of Frequency Allocations referring to RR9.21 (e.g., RR5.316A, RR5.316B, etc.) in respect to all services which have allocations in the concerned frequency band of the same or a higher category of allocation.
This type of coordination applies to stations of non-planned terrestrial services operating in the bands and geographical areas covered by different Regional Agreements (e.g. GE85-EMA) vis-à-vis planned services.
This type of coordination applies to some terrestrial services where the coordination requirement is established WRC Resolution. For example, under Resolutions 612 (WRC-12) oceanographic radars operating in the frequency bands between 3 and 50 MHz are required to complete coordination with neighboring countries.
