47 CFR § 80.215 - Transmitter power.
(a) Transmitter power shown on the radio station authorization is the maximum power the licensee is authorized to use. Power is expressed in the following terms:
(1) For single sideband emission: Peak evelope power;
(2) For G3E emission: Carrier power;
(3) For PON and F3N emission: Mean power;
(4) For all emissions in the 1626.5-1646.5 MHz band: equivalent isotropic radiated power.
(5) For all other emissions: the carrier power multiplied by 1.67.
(b) Coast station frequencies below 27500 kHz. The maximum power must not exceed the values listed below.
(1) Public coast stations, except Alaska:
(2) Private coast stations, except in Alaska: 1kW
(3) Coast stations in Alaska, public and private:
(c) Coast station frequencies above 27500 kHz. The maximum power must not exceed the values listed below.
(1) Coast stations:
1 Maximum authorized power at the input terminals of the station antenna.
2 See paragraph (h) of this section.
(2) Marine utility stations:
(d) Ship station frequencies below 27500 kHz. The maximum power must not exceed the values listed below:
(1) Radiotelegraphy: All ships - 2kW 3
(ii) All ships - Open waters; 2000-4000 kHz - 150W
4 For passenger ships 5000 gross tons and over - 1kW.
(iii) All ships - Open waters; 4000-27500 kHz - 1.5kW 5.
5 For passenger ships 5,000 gross tons and over 3kW.
(3) Digital selective calling:
(e) Ship stations frequencies above 27500 kHz. The maximum power must not exceed the values listed below.
(1) Ship stations 156-162 MHz - 25W 6
6 Reducible to 1 watt or less, except for transmitters limited to public correspondence channels and used in an automated system.
(2) Ship stations 216-220 MHz - 25W 7
(3) On board stations 456-468 MHz - 4W 8
8 Certification based on a carrier power of 4 watts with transmitter connected to a dummy load of matching impedance. The effective radiated power must not exceed 2 watts.
(4) Ship earth stations 1626.5-1646.5 MHz 9
9 See paragraph (k) of this section.
(6) EPIRB - 121.500 and 243.00 MHz 10
10 See subpart V of this part.
(7) EPIRB - 156.750 and 156.800 MHz 10
(f) Fixed stations. The maximum power must not exceed the values + listed below.
(1) Maritime support (receiver test):
(2) Operational fixed: 72-76 MHz and above 162 MHz 11
11 See paragraph (l) of this section.
(3) Alaska - Private fixed: 12
12 The frequencies 156.375 MHz and 156.650 MHz are primarily intership frequencies. When authorized for coast stations on a secondary basis, the normal output power must not exceed 1 watt and the maximum output power must not exceed 10 watts.
(4) Alaska - Public fixed:
(g) The carrier power of ship station radiotelephone transmitters, except portable transmitters, operating in the 156-162 MHz band must be at least 8 but not more than 25 watts. Transmitters that use 12 volt lead acid storage batteries as a primary power source must be measured with a primary voltage between 12.2 and 13.7 volts DC. Additionally, unless otherwise indicated, equipment in radiotelephone ship stations operating in the 156-162 MHz band must meet the following requirements:
(1) All transmitters and remote control units must be capable of reducing the carrier power to one watt or less;
(2) Except as indicated in (g)(4) of this section, all transmitters manufactured after January 21, 1987, or in use after January 21, 1997, must automatically reduce the carrier power to one watt or less when the transmitter is tuned to 156.375 MHz or 156.650 MHz, and must be provided with a manual override switch which when held by an operator will permit full carrier power operation on 156.375 MHz and 156.650 MHz;
(4) Hand-held portable transmitters are not required to comply with the automatic reduction of carrier power in (g)(2) of this section; and
(5) Transmitters dedicated for use on public correspondence duplex channels as additional equipment to a VHF ship station in the Great Lakes which meet all pertinent rules in this part are not required to reduce their carrier power to one watt.
(h) Coast stations in an AMTS may radiate as follows, subject to the condition that no harmful interference will be caused to television reception except that TV services authorized subsequent to the filing of the AMTS station application will not be protected.
(1) When located more than 169 kilometers (105 miles) from the antenna of a Channel 13 TV station and more than 129 kilometers (80 miles) from the antenna of a channel 10 station, the ERP of coast stations having an antenna height of 61 meters (200 feet) or less above ground must not exceed 1000 watts.
(2) Coast stations located less than 169 kilometers (105 miles) from a channel 13 TV station, or less than 129 kilometers (80 miles) from a channel 10 TV station, or when using a transmitting antenna height above ground greater than 61 meters (200 feet), must submit a plan to limit interference to TV reception, unless the station's predicted interference contour is fully encompassed by the composite interference contour of the system's existing stations, or the station's predicted interference contour extends the system's composite interference contour over water only (disregarding uninhabited islands). The plan must include:
(i) A description of the interference contour with indentification of the method used to determine this contour; and
(ii) A statement concerning the number of residences within the interference contour. The interference contour includes only areas inside the TV grade B contour with the latter determined assuming maximum permissible TV antenna height and power for broadcast stations and the actual facility parameters for translators and low power TV stations. See part 73, subpart E of this chapter for further information on TV grade B contour determination.
(3) When located as described in paragraph (h)(2) of this section, the coast station (or stations affecting the same TV Grade B contour) will be authorized if the applicant's plan has limited the interference contour(s) to fewer than 100 residences or if the applicant:
(i) Shows that the proposed site is the only suitable location (which, at the application stage, requires a showing that the proposed site is especially well-suited to provide the proposed service);
(ii) Develops a plan to control any interference caused to TV reception within the Grade B contour from its operations; and
(iii) Agrees to make such adjustments in the TV receivers affected as may be necessary to eliminate interference caused by its operations.
(4) The applicant must eliminate any interference caused by its operation to TV reception within the Grade B contour that might develop within 90 days of the time it is notified in writing by the Commission. If this interference is not removed within the 90-day period, operation of the coast station must be discontinued. The licensee is expected to help resolve all complaints of interference, whether inside or outside the Grade B contour.
(5) The transmitter power, as measured at the input terminals to the station antenna, must be 50 watts or less.
(i) A ship station must have a transmitter output not exceeding 25 watts and an ERP not exceeding 18 watts. The maximum transmitter output power is permitted to be increased to 50 watts under the following conditions:
(1) Increases exceeding 25 watts are made only by radio command from the controlling coast stations; and
(2) The application for an equipment authorization demonstrates that the transmitter output power is 25 watts or less when external radio commands are not present.
(j) A ship installation with a transmitter output power exceeding 25 watts under the conditions of paragraph (i) of this section is exempted from the limitation of 18 watts ERP when operating in specific geographical areas identified in a plan for the use of higher power.
(k) Within the 1626.5-1646.5 MHz band the maximum e.i.r.p by a ship earth station in any direction in the horizontal plane or in the direction of the space station must not exceed + 40 dB relative to one watt in any 4 kHz band in the main beam, except upon a satisfactory showing of need for greater power, in which case a maximum of + 55 dB relative to one watt may be authorized.
(l) For operational fixed stations using frequencies in the 72-76 MHz band and for other classes of stations operating above 162.025 MHz, the transmitter power must be specified in the station authorization. Frequencies in the 72-76 MHz band are listed in § 80.381. The operational requirements for 72-76 MHz are contained in subpart L of this part.
(m) For radiodetermination transmitters using A1D, A2D, F1D, F2D, G1D and G2D emissions on 154.585 MHz, 159.480 MHz, 160.725 MHz, 160.785 MHz, 454.000 MHz and 459.000 MHz the mean output power of the unmodulated carrier must not exceed 25 watts.
(n) For radiodetermination stations operating above 2400 MHz the output power must be as follows:
(2) For search and rescue stations the output power must be at least 400 milliwatts peak e.i.r.p.
(3) For all other transponder stations the output power must not exceed 20 watts peak e.i.r.p. Licensees of non-selectable transponder coast stations operating in the 2920-3100 MHz and 9320-9500 MHz bands must notify in writing the USCG District Commander of any incremental increase of their station's output power above 5 watts peak e.i.r.p.