Sec. 74.951  Modification of transmission systems.

    Formal application on FCC Form 330 is required for any of the 
following changes or modifications of the transmission systems:
    (a) Replacement of the transmitter as a whole, except replacement 
with a transmitter of identical power rating which has been type 
accepted by the FCC for use by instructional TV fixed stations, or any 
change which could result in a change in the electrical characteristics 
or performance of the station. Upon the installation or modification of 
the transmitting equipment for which prior FCC authority is not required 
under the provisions of this paragraph, the licensee shall place in the 
station records a certification that the new installation complies in 
all respects with the technical requirements of this part and the terms 
of the station authorization.
    (b) Any change in the antenna system affecting the direction of 
radiation, directive radiation pattern, antenna gain, or radiated power.
    (c) Any change in the overall height of the antenna structure, 
except where notice to the Federal Aviation Administration is 
specifically not required under Sec. 17.14(b) of the FCC Rules.
    (d) Any change in the location of the transmission system except a 
move within the same building or upon the same antenna supporting 
structure.
    (e) A change in frequency assignment.
    (f) A change in the operating power.
    (g) Any addition of receiving locations or to modify such a location 
to a receive and response station.

[ 45 FR 26068 , Apr. 17, 1980, as amended at  50 FR 26761 , June 28, 1985; 
 52 FR 3806 , Feb. 6, 1987;  53 FR 36788 , Sept. 22, 1988]