Text of agen­da item 1.14 and accom­pa­ny­ing res­o­lu­tion 662 (WRC-23)

Exist­ing allo­ca­tions in 231.5–252 GHz

His­to­ry and use of the allo­ca­tions by the ama­teur and ama­teur-satel­lite ser­vices
The ama­teur and ama­teur-satel­lite allo­ca­tions of 248–250 GHz (pri­ma­ry) and 241–248 GHz (sec­ondary) were made at the 1979 World Admin­is­tra­tive Radio Con­fer­ence. The allo­ca­tions have been used for ter­res­tri­al prop­a­ga­tion exper­i­ments; com­mu­ni­ca­tion over paths as long as 114 km has been achieved. No ama­teur satel­lites have uti­lized the allo­ca­tion yet.

AI 1.14 – Review of EESS (pas­sive) allo­ca­tion require­ments between 231.5 GHz and 252 GHz (July 2022)

The issue for the ama­teur and ama­teur-satel­lite ser­vices is to pro­tect the pri­ma­ry allo­ca­tion at 248–250 GHz and the sec­ondary allo­ca­tion at 241–248 GHz. Prepa­ra­tions for the agen­da item are focused on the bands 239.2–242.2 GHz and 244.2–247.2 GHz. The fixed and mobile ser­vices have pri­ma­ry allo­ca­tions at 239.2–241 GHz. It has been deter­mined that these ser­vices are incom­pat­i­ble with extreme­ly sen­si­tive EESS (pas­sive) sys­tems, so the pos­si­bil­i­ty of shift­ing the fixed and mobile ser­vices to 235–238 GHz is being explored. There is no indi­ca­tion that changes in the ama­teur and ama­teur-ser­vice allo­ca­tions are being considered.