§  1.30001   Definitions.

   For purposes of this subpart:

   (a) Wavelength at the AM frequency. In this subpart, critical distances
   from an AM station are described in terms of the AM wavelength. The AM
   wavelength, expressed in meters, is computed as follows:

   (300 meters)/(AM frequency in megahertz) = AM wavelength in meters.

   For example, at the AM frequency of 1000 kHz, or 1 MHz, the wavelength
   is (300/1 MHz) = 300 meters.

   (b) Electrical degrees at the AM frequency. This term describes the
   height of a proposed tower as a function of the frequency of a nearby
   AM station. To compute tower height in electrical degrees, first
   determine the AM wavelength in meters as described in paragraph (a) of
   this section. Tower height in electrical degrees is computed as
   follows: (Tower height in meters)/(AM wavelength in meters) × 360
   degrees = Tower height in electrical degrees. For example, if the AM
   frequency is 1000 kHz, then the wavelength is 300 meters, per paragraph
   (a) of this section. A nearby tower 75 meters tall is therefore
   [75/300] × 360 = 90 electrical degrees tall at the AM frequency.

   (c) Proponent. The term proponent refers in this section to the party
   proposing tower construction or significant modification of an existing
   tower or proposing installation of an antenna on an AM tower.

   (d) Distance from the AM station. The distance shall be calculated from
   the tower coordinates in the case of a nondirectional AM station, or
   from the array center coordinates given in CDBS or any successor
   database for a directional AM station.