{"data":{"id":"us/47-cfr-87.131","jurisdiction":"us","citation":"47 CFR 87.131","heading":"Power and emissions.","body":"The following table lists authorized emissions and maximum power. Power must be determined by direct measurement.\nClass of station Frequency band/frequency Authorized emission(s) 9 Maximum power 1\nAeronautical advisory VHF A3E 10 watts. 10\nAeronautical multicom VHF A3E 10 watts.\nAeronautical enroute and aeronautical fixed HF R3E, H3E, J3E, J7B, H2B, J2D 6 kw.\nHF A1A, F1B, J2A, J2B 1.5 kw.\nVHF A3E, A9W G1D, A2D\nAeronautical search and rescue VHF HF A3E R3E, H3E, J3E 10 watts. 100 watts.\nOperational fixed VHF G3E, F2D 30 watts.\nFlight test land VHF A3E 200 watts.\nUHF F2D, F9D, F7D 25 watts. 3\nHF H2B, J3E, J7D, J9W 6.0 kw.\nAviation support VHF A3E 50 watts.\nAirport control tower VHF A3E, G1D, G7D 50 watts.\nBelow 400 kHz A3E 15 watts.\nAeronautical utility mobile VHF A3E 10 watts.\n1090 MHz M1D 20 watts.\nAircraft data link land test 131.450 MHz, 131.550 MHz, 131.725 MHz, 131.825 MHz, 136.850 MHz A2D 100 microwatts.\n136.900 MHz, 136.925 MHz, 136.950 MHz, 136.975 MHz G1D 100 microwatts.\nRadionavigation land test 108.150 MHz A9W 1 milliwatt.\n334.550 MHz A1N 1 milliwatt.\nOther VHF M1A, XXA, A1A, A1N, A2A, A2D, A9W 1 watt.\nOther UHF M1A, XXA, A1A, A1N, A2A, A2D, A9W 1 watt.\n5031.0 MHz F7D 1 watt.\nRadionavigation land Various 4 Various 4 Various. 4\nAeronautical Frequencies\nAircraft (Communication) UHF F2D, F9D, F7D 25 watts.\nVHF A3E, A9W, G1D, G7D, A2D 55 watts.\nHF R3E, H3E, J3E, J7B, H2B, J7D, J9W 400 watts.\nHF A1A, F1B, J2A, J2B 100 watts.\nMarine Frequencies 5\n156.300 MHz G3E 5 watts.\n156.375 MHz G3E 5 watts.\n156.400 MHz G3E 5 watts.\n156.425 MHz G3E 5 watts.\n156.450 MHz G3E 5 watts.\n156.625 MHz G3E 5 watts.\n156.800 MHz G3E 5 watts.\n156.900 MHz G3E 5 watts.\n157.425 MHz G3E 5 watts.\nHF 6 R3E, H3E, J3E, J2B, F1B, A3E 1000 watts. 250 watts.\nMF 6 R3E, H3E, J3E, J2B, F1B 1000 watts.\nHF 6 A3E 250 watts.\n(Radionavigation) Various 7 Various 7 Various. 7\nAircraft earth UHF G1D, G1E, G1W 60 watts. 8\nDifferential GPS VHF G7D Various. 2\n1 The power is measured at the transmitter output terminals and the type of power is determined according to the emission designator as follows:\n(i) Mean power (pY) for amplitude modulated emissions and transmitting both sidebands using unmodulated full carrier.\n(ii) Peak envelope power (pX) for all emission designators other than those referred to in paragraph (i) of this note.\n2 Power and antenna height are restricted to the minimum necessary to achieve the required service.\n3 Transmitter power may be increased to overcome line and duplexer losses but must not exceed 25 watts delivered to the antenna.\n4 Frequency, emission, and maximum power will be determined after coordination with appropriate Government agencies.\n5 To be used with airborne marine equipment certificated for part 80 (ship) and used in accordance with part 87.\n6 Applicable onIy to marine frequencies used for public correspondence.\n7 Frequency, emission, and maximum power will be determined by appropriate standards during the certification process.\n8 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.\n9 Excludes automatic link establishment.\n10 Power is limited to 0.5 watt, but may not exceed 2 watts when station is used in an automatic unattended mode.","path":["Title 47—Telecommunication","CHAPTER I—FEDERAL COMMUNICATIONS COMMISSION","SUBCHAPTER D—SAFETY AND SPECIAL RADIO SERVICES","PART 87—AVIATION SERVICES","Subpart D—Technical Requirements"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-47.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:28Z","sha256":"340fbf94ac7da70137ea4839d09d478fdf746ed48135ea45f924abb0314be220","source_id":"us-cfr","stale":true,"prev":"us/47-cfr-87.111","next":"us/47-cfr-87.133"},"notice":"GroundRules: Original legal text. Not legal advice."}