WARC-92 allocated the frequency band 21.4-22.0 GHz to BSS (HDTV) in Regions 1 and 3 and the band 17.3-17.8 GHz in Region 2. Due to severe atmospheric attenuation levels in these frequency bands and in the 12 GHz BSS band for tropical countries, convention
ITU-R BO.2007-1-1998 history
1998ITU-R BO.2007-1-1998 Considerations for the Introduction of Broadcasting Satellite Service High Definition Television Systems