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5.558A in the Radio Frequency Table Allocation of Ireland.

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Content Type
ITU FOOTNOTE
Title
5.558A
Description
Use of the band 56.9-57 GHz by inter-satellite systems is limited to links between satellites in geostationary-satellite orbit and to transmissions from non-geostationary satellites in high-Earth orbit to those in low-Earth orbit. For links between satellites in the geostationary-satellite orbit, the single entry power flux-density at all altitudes from 0 km to 1 000 km above the Earth’s surface, for all conditions and for all methods of modulation, shall not exceed –147 dB(W/(m2.100 MHz)) for all angles of arrival. (WRC-97)
Source
https://search.itu.int/history/HistoryDigitalCollectionDocLibrary/1.43.48.en.101.pdf