that difficulties can arise if spacecraft in the neighbourhood of the Moon, in highly elliptic Earth orbits, or
in halo orbits around the & or r, Sun-Earth Lagrangian points, share frequencies with spacecraft engaged On
missions to much greater distance
ITU-R 610-1-1990 history
1990ITU-R 610-1-1990 (WITHDRAWN) Protection of Allocations for Deep-Space Research - Section 2E - Space Research