---
kind: "section"
citation: "47 C.F.R. § 1.30001"
title: "47"
number: "1.30001"
heading: "Definitions."
url: "https://uscodex.org/cfr/47/1.30001"
---

# §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:

  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)](#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)](#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 LMS or any successor database for a directional AM station.

## Notes

### Amendments

[78 FR 66295, Nov. 5, 2013, as amended at 78 FR 70499, Nov. 26, 2013, as amended at 91 FR 29045, May 19, 2026]

### Source

Source: 78 FR 66295, Nov. 5, 2013, as amended at 78 FR 70499, Nov. 26, 2013, unless otherwise noted.

### Authority

Authority: 47 U.S.C. chs. 2, 5, 9, 13; 28 U.S.C. 2461 note; 47 U.S.C. 1754, unless otherwise noted.

### Amendments

[78 FR 66295, Nov. 5, 2013, as amended at 78 FR 70499, Nov. 26, 2013, as amended at 91 FR 29045, May 19, 2026]