§  74.551   Equipment changes.

   (a) Modifications may be made to an existing authorization in
   accordance with § § 1.929 and 1.947 of this chapter.

   (b) Permissible changes in equipment operating in the bands 18.3-18.58,
   18.76-18.82 GHz and 19.1-19.16 GHz. Notwithstanding other provisions of
   this section, licensees of stations that remain co-primary under the
   provisions of § 74.502(c) 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.

   [ 28 FR 13716 , Dec. 14, 1963, as amended at  38 FR 6827 , Mar. 13, 1973;
    47 FR 54448 , Dec. 3, 1982;  49 FR 7130 , Feb. 27, 1984;  50 FR 48599 , Nov.
   26, 1985;  58 FR 19775 , Apr. 16, 1993;  61 FR 4368 , Feb. 6, 1996;  65 FR 54172 , Sept. 7, 2000;  68 FR 12768 , Mar. 17, 2003;  68 FR 16967 , Apr. 8,
   2003;  68 FR 20225 , Apr. 24, 2003;  69 FR 43772 , July 22, 2004]