§  73.1665   Main transmitters.

   (a) Each AM, FM, TV and Class A 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).

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

   Table 1 to Paragraph (b)
   Authorized power Maximum
   rated
   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) has been approved with Supplier's
   Declaration of Conformity. 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   Note 1 to paragraph (c): The verification procedure has been replaced
   by Supplier's Declaration of Conformity. Transmitters previously
   authorized under subpart J of this chapter may remain in use. See
   § 2.950 of this chapter.

   Note 2 to paragraph (c): Pending the availability of AM broadcast
   transmitters that are authorized for use in the 1605-1705 kHz band,
   transmitters that are approved or verified for use in the 535-1605 kHz
   band may be utilized in the 1605-1705 kHz band if it is shown that the
   requirements of § 73.44 have been met. Equipment authorization for the
   transmitter 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;  63 FR 36604 , July 7, 1998;  65 FR 30004 , May 10, 2000;  82 FR 50835 , Nov. 2, 2017]