§ 1.30003   Installations on an AM antenna.

   (a) Installations on a nondirectional AM tower. When antennas are installed
   on a nondirectional AM tower the AM station shall determine the operating
   power by the indirect method (see § 73.51 of this chapter). Upon completion
   of the installation, antenna impedance measurements on the AM antenna shall
   be made. If the resistance of the AM antenna changes by more than 2 percent
   (see  § 73.45(c)(1) of this chapter), an application on FCC Form 302-AM
   (including a tower sketch of the installation) shall be filed with the
   Commission for the AM station to return to direct power measurement.

   (b) Installations on a directional AM array. Before antennas are installed
   on a tower in a directional AM array, the proponent shall notify the AM
   station so that, if necessary, the AM station may determine operating power
   by the indirect method (see § 73.51 of this chapter) and request special
   temporary authority pursuant to § 73.1635 of this chapter to operate with
   parameters at variance.

   (1)  For  AM  stations  licensed  via field strength measurements (see
   § 73.151(a)), a partial proof of performance as defined by § 73.154 of this
   chapter shall be conducted by the tower proponent both before and after
   construction to establish that the AM array will not be and has not been
   adversely affected. If the operating parameters of the AM array change
   following the installation, the results of the partial proof of performance
   shall be filed by the AM station with the Commission on Form 302-AM.

   (2) For AM stations licensed via a moment method proof (see § 73.151(c) of
   this chapter), a base impedance measurement on the tower being modified
   shall be made by the tower proponent as described in § 73.151(c)(1). The
   result of the new tower impedance measurement shall be retained in the
   station's records. If the new measured base resistance and reactance values
   of the affected tower differ by more than ±2 ohms and ±4 percent from the
   corresponding modeled resistance and reactance values contained in the last
   moment method proof, then the station shall file Form 302-AM. The Form
   302-AM  shall be accompanied by the new impedance measurements for the
   modified tower and a new moment method model for each pattern in which the
   tower is a radiating element. Base impedance measurements for other towers
   in the array, sampling system measurements, and reference field strength
   measurements  need  not  be repeated. The procedures described in this
   paragraph may be used as long as the affected tower continues to meet the
   requirements for moment method proofing after the modification.

   (c) Form 302-AM Filing. When the AM station is required to file Form 302-AM
   following an installation as set forth in paragraphs (a) and (b) of this
   section, the Form 302-AM shall be filed before or simultaneously with any
   license  application  associated  with the installation. If no license
   application is filed as a result of the installation, the Form 302-AM shall
   be filed within 30 days after the completion of the installation.

   [ 78 FR 66295 , Nov. 5, 2013]

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