#### § 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 power1 |
| --- | --- | --- | --- |
| 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 | Various4 | Various4 | 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 Frequencies5 | | |
| | 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. |
| | HF6 | R3E, H3E, J3E, J2B, F1B, A3E | 1000 watts. 250 watts. |
| | MF6 | R3E, H3E, J3E, J2B, F1B | 1000 watts. |
| | HF6 | A3E | 250 watts. |
| (Radionavigation) | Various7 | Various7 | 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](https://www.federalregister.gov/citation/54-FR-11720), Mar. 22, 1989, as amended at [57 FR 45749](https://www.federalregister.gov/citation/57-FR-45749), Oct. 5, 1992; [62 FR 40308](https://www.federalregister.gov/citation/62-FR-40308), July 28, 1997; [63 FR 36607](https://www.federalregister.gov/citation/63-FR-36607), July 7, 1998; [64 FR 27474](https://www.federalregister.gov/citation/64-FR-27474), May 20, 1999; [66 FR 26798](https://www.federalregister.gov/citation/66-FR-26798), May 15, 2001; [69 FR 32880](https://www.federalregister.gov/citation/69-FR-32880), June 14, 2004; [78 FR 61205](https://www.federalregister.gov/citation/78-FR-61205), Oct. 3, 2013]