47 CFR 87.131 - Power and emissions.

Regulations last checked for updates: Nov 25, 2024

Title 47 - Telecommunication last revised: Nov 20, 2024

View all text of Subpart D [§ 87.131 - § 87.151]

§ 87.131 - Power and emissions.

The following table lists authorized emissions and maximum power. Power must be determined by direct measurement.

Class of station	Frequency band/frequency	Authorized emission(s) ⁹	Maximum power ¹
Aeronautical advisory	VHF	A3E	10 watts. ¹⁰
Aeronautical multicom	VHF	A3E	10 watts.
Aeronautical enroute and aeronautical fixed	HF	R3E, H3E, J3E, J7B, H2B, J2D	6 kw.
	HF	A1A, F1B, J2A, J2B	1.5 kw.
	VHF	A3E, A9W G1D, A2D
Aeronautical search and rescue	VHF HF	A3E R3E, H3E, J3E	10 watts. 100 watts.
Operational fixed	VHF	G3E, F2D	30 watts.
Flight test land	VHF	A3E	200 watts.
	UHF	F2D, F9D, F7D	25 watts. ³
	HF	H2B, J3E, J7D, J9W	6.0 kw.
Aviation support	VHF	A3E	50 watts.
Airport control tower	VHF	A3E, G1D, G7D	50 watts.
	Below 400 kHz	A3E	15 watts.
Aeronautical utility mobile	VHF	A3E	10 watts.
	1090 MHz	M1D	20 watts.
Aircraft data link land test	131.450 MHz, 131.550 MHz, 131.725 MHz, 131.825 MHz, 136.850 MHz	A2D	100 microwatts.
	136.900 MHz, 136.925 MHz, 136.950 MHz, 136.975 MHz	G1D	100 microwatts.
Radionavigation land test	108.150 MHz	A9W	1 milliwatt.
	334.550 MHz	A1N	1 milliwatt.
	Other VHF	M1A, XXA, A1A, A1N, A2A, A2D, A9W	1 watt.
	Other UHF	M1A, XXA, A1A, A1N, A2A, A2D, A9W	1 watt.
	5031.0 MHz	F7D	1 watt.
Radionavigation land	Various ⁴	Various ⁴	Various. ⁴
	Aeronautical Frequencies
Aircraft (Communication)	UHF	F2D, F9D, F7D	25 watts.
	VHF	A3E, A9W, G1D, G7D, A2D	55 watts.
	HF	R3E, H3E, J3E, J7B, H2B, J7D, J9W	400 watts.
	HF	A1A, F1B, J2A, J2B	100 watts.
	Marine Frequencies ⁵
	156.300 MHz	G3E	5 watts.
	156.375 MHz	G3E	5 watts.
	156.400 MHz	G3E	5 watts.
	156.425 MHz	G3E	5 watts.
	156.450 MHz	G3E	5 watts.
	156.625 MHz	G3E	5 watts.
	156.800 MHz	G3E	5 watts.
	156.900 MHz	G3E	5 watts.
	157.425 MHz	G3E	5 watts.
	HF ⁶	R3E, H3E, J3E, J2B, F1B, A3E	1000 watts. 250 watts.
	MF ⁶	R3E, H3E, J3E, J2B, F1B	1000 watts.
	HF ⁶	A3E	250 watts.
(Radionavigation)	Various ⁷	Various ⁷	Various. ⁷
Aircraft earth	UHF	G1D, G1E, G1W	60 watts. ⁸
Differential GPS	VHF	G7D	Various. ²

¹ The power is measured at the transmitter output terminals and the type of power is determined according to the emission designator as follows:

(i) Mean power (pY) for amplitude modulated emissions and transmitting both sidebands using unmodulated full carrier.

(ii) Peak envelope power (pX) for all emission designators other than those referred to in paragraph (i) of this note.

² Power and antenna height are restricted to the minimum necessary to achieve the required service.

³ Transmitter power may be increased to overcome line and duplexer losses but must not exceed 25 watts delivered to the antenna.

⁴ Frequency, emission, and maximum power will be determined after coordination with appropriate Government agencies.

⁵ To be used with airborne marine equipment certificated for part 80 (ship) and used in accordance with part 87.

⁶ Applicable onIy to marine frequencies used for public correspondence.

⁷ Frequency, emission, and maximum power will be determined by appropriate standards during the certification process.

⁸ Power may not exceed 60 watts per carrier, as measured at the input of the antenna subsystem, including any installed diplexer. The maximum EIRP may not exceed 2000 watts per carrier.

⁹ Excludes automatic link establishment.

¹⁰ Power is limited to 0.5 watt, but may not exceed 2 watts when station is used in an automatic unattended mode.

[54 FR 11720, Mar. 22, 1989, as amended at 57 FR 45749, Oct. 5, 1992; 62 FR 40308, July 28, 1997; 63 FR 36607, July 7, 1998; 64 FR 27474, May 20, 1999; 66 FR 26798, May 15, 2001; 69 FR 32880, June 14, 2004; 78 FR 61205, Oct. 3, 2013]

authority: 47 U.S.C. 154,303,unless

source: 53 FR 28940, Aug. 1, 1988, unless otherwise noted.

cite as: 47 CFR 87.131