Sec. 73.1665  Main transmitters.

    (a) Each AM, FM and TV broadcast station must have at least one main 
transmitter which complies with the provisions of the transmitter 
technical requirements for the type and class of station. A main 
transmitter is one which is used for regular program service having 
power ratings appropriate for the authorized operating power(s).

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    (b) There is no maximum power rating limit for FM or TV station 
transmitters, however, the maximum rated transmitter power of a main 
transmitter installed at an AM station shall be as follows:

                                                                        
------------------------------------------------------------------------
                                                               Maximum  
                                                                rated   
                      Authorized power                       transmitter
                                                              power (kW)
------------------------------------------------------------------------
0.25, 0.5, or 1 kW.........................................            1
2.5 kW.....................................................            5
5 or 10 kW.................................................           10
25 or 50 kW................................................           50
------------------------------------------------------------------------

    (c) A licensee may, without further authority or notification to the 
FCC, replace an existing main transmitter or install additional main 
transmitter(s) for use with the authorized antenna if the replacement or 
additional transmitter(s) is type accepted or notified as shown in the 
FCC's ``Radio Equipment List''. Within 10 days after commencement of 
regular use of the replacement or additional transmitter(s), equipment 
performance measurements, as prescribed for the type of station are to 
be completed.

    Note: Pending the availability of AM broadcast transmitters that are 
type-accepted for use in the 1605-1705 kHz band, transmitters that are 
type-accepted for use in the 535-1605 kHz band as shown on the FCC's 
Radio Equipment List may be utilized in the 1605-1705 kHz band if it is 
shown that the requirements of Sec. 73.44 have been met. FCC approval of 
the manufacturer's application for type-acceptance will supersede the 
applicability of this note.


[ 43 FR 53741 , Nov. 17, 1978, as amended at  47 FR 8590 , Mar. 1, 1982;  47 FR 28388 , June 30, 1982;  49 FR 4000 , Feb. 1, 1984;  51 FR 18451 , May 20, 
1986;  56 FR 64872 , Dec. 12, 1991]