Power and emissions.

  1. Law
  2. CFR 47
  3. Telecommunication
  4. Federal Communications Commission
  5. Safety and Special Radio Services
  6. Aviation Services
  7. Technical Requirements
  8. Power and emissions.

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§ 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, 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]


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