Permissible changes in equipment operating in the band 18.3-19.3 GHz: Notwithstanding other provisions of this section, stations that remain co-primary under the provisions of Sec. 101.147(r) may not make modifications to their systems that increase interference to satellite earth stations, or result in a facility that would be more costly to relocate. [68 FR 16968, Apr. 8, 2003]