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Very Low Frequency

9 - 30 kHz
  • Cable locating equipment [15.213]
  • Power line carrier systems (operated by a power utility for general supervision of the power system) [15.113]
  • Low Frequency

    30 - 70 kHz
  • Cable locating equipment [15.213]
  • Power line carrier systems (operated by a power utility for general supervision of the power system) [15.113]
  • 60 kHz - Radio station WWVB (time and frequency signals)
  • 70 - 90 kHz
  • Cable locating equipment [15.213]
  • Radiolocation, land or mobile [Part 90 Subpart F]
  • International Fixed Service
  • Maritime Mobile Service
  • Power line carrier systems (operated by a power utility for general supervision of the power system) [15.113]
  • 90 - 110 kHz
  • LORAN-C navigation system
  • Cable locating equipment [15.213]
  • 101.4 kHz - Transmitters used to detect buried electronic markers used by telephone companies [15.205(d)(2)]
  • Radiolocation, land [Part 90]
  • Power line carrier systems (operated by a power utility for general supervision of the power system) [15.113]
  • 110 - 130 kHz
  • Cable locating equipment [15.213]
  • Radiolocation, land or mobile [Part 90 Subpart F]
  • Power line carrier systems (operated by a power utility for general supervision of the power system) [15.113]
  • International Fixed Service
  • Maritime Mobile Service
  • 130 - 160 kHz
  • Cable locating equipment [15.213]
  • Power line carrier systems (operated by a power utility for general supervision of the power system) [15.113]
  • 160 - 190 kHz
  • Cable locating equipment [15.213]
  • Intentional radiators, 1 watt max. [15.217]
  • Power line carrier systems (operated by a power utility for general supervision of the power system) [15.113]
  • 190 - 200 kHz
  • Radiobeacons for aircraft navigation [Part 87]
  • Cable locating equipment [15.213]
  • 200 - 285 kHz
  • Radiobeacons for aircraft navigation [Part 87]
  • Air traffic control [Part 87]
  • Cable locating equipment [15.213]
  • 285 - 325 kHz
  • Marine Radiobeacons
  • Cable locating equipment [15.213]
  • Power line carrier systems (operated by a power utility for general supervision of the power system) [15.113]
  • Medium Frequency

    325 - 405 kHz
  • Radiobeacons for aircraft navigation [Part 87]
  • Air traffic control [Part 87]
  • Cable locating equipment [15.213]
  • Power line carrier systems (operated by a power utility for general supervision of the power system) [15.113]
  • 405 - 435 kHz
  • Radiobeacons for aircraft navigation [Part 87]
  • Cable locating equipment [15.213]
  • Power line carrier systems (operated by a power utility for general supervision of the power system) [15.113]
  • 435 - 490 kHz
  • Cable locating equipment [15.213]
  • Power line carrier systems (operated by a power utility for general supervision of the power system) [15.113]
  • 457 kHz
  • 500 kHz
  • International calling and distress frequency for ships and aircraft over the high seas
  • 510 - 525 kHz
  • Radiobeacons for aircraft navigation
  • Intentional radiators, 100 milliwatts max. [15.219]
  • 525 - 535 kHz
  • Intentional radiators, 100 milliwatts max. [15.219]
  • Carrier current broadcasting [15.221]
  • Travelers' Information Stations, 530 through 1700 kHz in 10 kHz increments [90.242]
  • 535 - 1705 kHz
  • AM broadcast [Part 73 Subpart A]
  • Intentional radiators, 100 milliwatts max. [15.219]
  • Carrier current broadcasting [15.221]
  • Travelers' Information Stations, 530 through 1700 kHz in 10 kHz increments [90.242]
  • 1630 kHz, Public Safety, Fire, Base or mobile [90.20]
  • 1638 kHz, Aeronautical Radionavigation Service
  • 1605 - 1705 kHz, Radiolocation, no new assignments after September 30, 1985 [Part 90 Subpart F]
  • 1705 - 1750 kHz
  • Radiolocation [Part 90 Subpart F]
  • 1708 kHz, Aeronautical Radionavigation Service
  • 1722 kHz, Public Safety, Police, Base or mobile[90.20]
  • 1730 kHz, Public Safety, Police, Base or mobile[90.20]
  • 1750 - 1800 kHz
  • Radiolocation [Part 90 Subpart F]
  • Disaster Communications Service [90.103(c)(7)]
  • 1800 - 1900 kHz
  • Amateur (160 meter band) [Part 97]
  • 1900 - 1950 kHz
  • Amateur (160 meter band) [Part 97]
  • Radiolocation [Part 90 Subpart F]
  • 1950 - 2000 kHz
  • Amateur (160 meter band) [Part 97]
  • Radiolocation [Part 90 Subpart F]
  • 2003 kHz
  • Maritime SSB Radiotelephone [80.373] - Intership Safety and Operational - Great Lakes only

  • Gap in list
    2065 kHz
  • Maritime SSB Radiotelephone [80.373] - Business and Operational - All Areas.

  • Gap in list
    2079 kHz
  • Maritime SSB Radiotelephone [80.373] - Business and Operational - All Areas.
  • 2082.5 kHz
  • Maritime SSB Radiotelephone [80.373] - Intership Safety and Operational - All Areas. Also, intership non-commercial fishing.

  • Gap in list
    2093 kHz
  • Maritime SSB Radiotelephone [80.373] - Intership Safety and Operational - All Areas.
  • 2096.5 kHz
  • Maritime SSB Radiotelephone [80.373] - Business and Operational - All Areas.

  • Gap in list
    2142 kHz
  • Maritime SSB Radiotelephone [80.373] - Intership Safety and Operational - Pacific Coast, daily, south of 42 deg. N

  • Gap in list
    2182 kHz
  • Maritime SSB Radiotelephone [80.373] - Intership Safety and Operational - Distress, safety and calling
  • 2187.5 kHz
  • Digital Selective Calling (DSC) channel [part of Global Maritime Distress and Safety System (GMDSS)]

  • Gap in list
    2203 kHz
  • Maritime SSB Radiotelephone [80.373] - Intership Safety and Operational - Gulf of Mexico. Also, intership non-commercial fishing.

  • Gap in list
    2214 kHz
  • Maritime SSB Radiotelephone [80.373] - Intership Safety and Operational - All Areas.

  • Gap in list
    2500 kHz
  • Time and frequency broadcasts, WWV and WWVH

  • Gap in list
    2638 kHz
  • Maritime SSB Radiotelephone [80.373] - Intership Safety and Operational - All Areas.

  • Gap in list
    2670 kHz
  • Maritime SSB Radiotelephone [80.373] - Intership Safety and Operational - U.S. Coast Guard Liaison and Maritime Safety Broadcasts

  • Gap in list
    2738 kHz
  • Maritime SSB Radiotelephone [80.373] - Intership Safety and Operational - All Areas, except Great Lakes.

  • Gap in list
    2830 kHz
  • Maritime SSB Radiotelephone [80.373] - Intership Safety and Operational - Gulf of Mexico only.

  • Gap in list
    2851 kHz
  • Flight test stations - land and aircraft [Part 87 Subpart J]

  • Gap in list

    High Frequency


    Gap in list
    3.004 MHz
  • Flight test stations - land and aircraft [Part 87 Subpart J]

  • Gap in list
    3.023 MHz
  • Maritime SSB Radiotelephone [80.373] - Business and Operational - Government shore, ship and aircraft stations for search and rescue coordination.

  • Gap in list
    3.23 - 3.40 MHz
  • Radiolocation, associated with 1605 - 1800 kHz, secondary to other services [Part 90 Subpart F]
  • 3.281 MHz - Flight test stations - land and aircraft [Part 87 Subpart J]

  • Gap in list
    3.443 MHz
  • Flight test stations - land and aircraft [Part 87 Subpart J]

  • Gap in list
    3.5 - 3.75 MHz
  • Amateur (80 meter band) [Part 97]
  • 3.75 - 4 MHz
  • Amateur (75 meter band) [Part 97]
  • 4.0 - 4.152 MHz
  • Maritime SSB Radiotelephone [80.373]

  • Gap in list
    4207.5 kHz
  • Digital Selective Calling (DSC) channel [part of Global Maritime Distress and Safety System (GMDSS)]

  • Gap in list
    4.281 MHz
  • Maritime SSB Radiotelephone [80.373]

  • Gap in list
    4.351 - 4.438 MHz
  • Maritime SSB Radiotelephone [80.373]

  • Gap in list
    5.000 MHz
  • Time and frequency broadcasts, WWV and WWVH

  • Gap in list
    5.332 MHz
  • Amateur (60 meter band) [Part 97]

  • Gap in list
    5.348 MHz
  • Amateur (60 meter band) [Part 97]

  • Gap in list
    5.368 MHz
  • Amateur (60 meter band) [Part 97]

  • Gap in list
    5.373 MHz
  • Amateur (60 meter band) [Part 97]

  • Gap in list
    5.405 MHz
  • Amateur (60 meter band) [Part 97]

  • Gap in list
    5.451 MHz
  • Flight test stations - land and aircraft [Part 87 Subpart J]

  • Gap in list
    5.469 MHz
  • Flight test stations - land and aircraft [Part 87 Subpart J]

  • Gap in list
    5.571 MHz
  • Flight test stations - land and aircraft [Part 87 Subpart J]

  • Gap in list
    6.200 - 6.233 MHz
  • Maritime SSB Radiotelephone [80.373]

  • Gap in list
    6312.0 kHz
  • Digital Selective Calling (DSC) channel [part of Global Maritime Distress and Safety System (GMDSS)]

  • Gap in list
    6.501 - 6.525 MHz
  • Maritime SSB Radiotelephone [80.373]

  • Gap in list
    6.550 MHz
  • Flight test stations - land and aircraft [Part 87 Subpart J]

  • Gap in list
    6.765 - 6.795 MHz
  • Industrial, Scientific and Medical [Part 18]

  • Gap in list
    7 - 7.3 MHz
  • Amateur (40 meter band) [Part 97]

  • Gap in list
    8.101 - 8.300 MHz
  • Maritime SSB Radiotelephone [80.373]

  • Gap in list
    8414.5 kHz
  • Digital Selective Calling (DSC) channel [part of Global Maritime Distress and Safety System (GMDSS)]

  • Gap in list
    8.707 - 8.815 MHz
  • Maritime SSB Radiotelephone [80.373]

  • Gap in list
    8.822 MHz
  • Flight test stations - land and aircraft [Part 87 Subpart J]

  • Gap in list
    10.000 MHz
  • Time and frequency broadcasts, WWV and WWVH

  • Gap in list
    10.045 MHz
  • Flight test stations - land and aircraft [Part 87 Subpart J]

  • Gap in list
    10.1 - 10.15 MHz
  • Amateur (30 meter band) [Part 97]

  • Gap in list
    11.288 MHz
  • Flight test stations - land and aircraft [Part 87 Subpart J]

  • Gap in list
    11.306 MHz
  • Flight test stations - land and aircraft [Part 87 Subpart J]

  • Gap in list
    12.230 - 12.368 MHz
  • Maritime SSB Radiotelephone [80.373]

  • Gap in list
    12.577 MHz
  • Digital Selective Calling (DSC) channel [part of Global Maritime Distress and Safety System (GMDSS)]

  • Gap in list
    13.077 - 13.200 MHz
  • Maritime SSB Radiotelephone [80.373]

  • Gap in list
    13.312 MHz
  • Flight test stations - land and aircraft [Part 87 Subpart J]

  • Gap in list
    13.36 - 13.41 MHz
  • Radio astronomy

  • Gap in list
    13.553 - 13.567 MHz
  • Intentional radiators, 10,000 microvolts/meter at 30 meters max. [15.225]
  • Industrial, Scientific and Medical [Part 18]

  • Gap in list
    14 - 14.35 MHz
  • Amateur (20 meter band) [Part 97]

  • Gap in list
    15.000 MHz
  • Time and frequency broadcasts, WWV and WWVH

  • Gap in list
    16.360 - 16.549 MHz
  • Maritime SSB Radiotelephone [80.373]

  • Gap in list
    16.8045 MHz
  • Digital Selective Calling (DSC) channel [part of Global Maritime Distress and Safety System (GMDSS)]

  • Gap in list
    17.242 - 17.410 MHz
  • Maritime SSB Radiotelephone [80.373]

  • Gap in list
    17.964 MHz
  • Flight test stations - land and aircraft [Part 87 Subpart J]

  • Gap in list
    18.068 - 18.17 MHz
  • Amateur (17 meter band) [Part 97]

  • Gap in list
    18.780 - 18.846 MHz
  • Maritime SSB Radiotelephone [80.373]

  • Gap in list
    19.755 - 19.800 MHz
  • Maritime SSB Radiotelephone [80.373]

  • Gap in list
    20.000 MHz
  • Time and frequency broadcasts, WWV

  • Gap in list
    21 - 21.45 MHz
  • Amateur (15 meter band) [Part 97]

  • Gap in list
    21.931 MHz
  • Flight test stations - land and aircraft [Part 87 Subpart J]

  • Gap in list
    22.000 - 22.180 MHz
  • Maritime SSB Radiotelephone [80.373]

  • Gap in list
    22.696 - 22.855 MHz
  • Maritime SSB Radiotelephone [80.373]

  • Gap in list
    24.89 - 24.99 MHz
  • Amateur (12 meter band) [Part 97]
  • 24.990 - 25.005 MHz
  • 25000 kHz: standard frequency and time signals [2.106]
  • 25.02 MHz
  • Industrial/Business [90.35] only stations utilized for geophysical purposes
  • 25.04 MHz
  • Industrial/Business [90.35] oil spill containment and cleanup operations
  • 25.06 MHz
  • Industrial/Business [90.35] only stations utilized for geophysical purposes
  • 25.070 - 25.121 MHz
  • Maritime SSB Radiotelephone [80.373]
  • Industrial/Business [90.35]
  • 25.14 MHz
  • Industrial/Business [90.35]
  • only stations utilized for geophysical purposes
    25.16 MHz
  • Industrial/Business [90.35]
  • 25.18 MHz
  • Industrial/Business [90.35] only stations utilized for geophysical purposes
  • 25.20 MHz
  • Industrial/Business [90.35]
  • 25.22 MHz
  • Industrial/Business [90.35] geophysical stations on a secondary basis
  • 25.24 MHz
  • Industrial/Business [90.35]
  • 25.26 MHz
  • Industrial/Business [90.35] geophysical stations on a secondary basis
  • 25.28 MHz
  • Industrial/Business [90.35]
  • 25.30 MHz
  • Industrial/Business [90.35] geophysical stations on a secondary basis

  • Gap in list
    25.55 - 25.67 MHz
  • Radio astronomy

  • Gap in list
    25.85 - 26.48 MHz
  • Broadcast Auxiliary [Part 74 Subpart D]
  • 26.145 - 26.175 MHz only - Maritime SSB Radiotelephone [80.373] shore-to-ship

  • Gap in list
    26.617 MHz
  • Civil Air Patrol (CAP) (according to http://rob.acol.com/~cb/freeband.html)

  • Gap in list
    26.96 - 27.41 MHz
  • Citizens band (CB) [Part 95 - Subpart D]
  • 26.96 - 27.28 MHz
  • 27.430 MHz
  • Industrial/Business [90.35]
  • 27.450 MHz
  • Industrial/Business [90.35]
  • 27.470 MHz
  • Industrial/Business [90.35]
  • 27.490 MHz
  • Industrial/Business [90.35]
  • 27.510 MHz
  • Industrial/Business [90.35]
  • 27.530 MHz
  • Industrial/Business [90.35]

  • Gap in list
    27.870 MHz
  • US Navy-MARS (according to http://rob.acol.com/~cb/freeband.html)

  • Gap in list
    27.920 MHz
  • US Navy-MARS (according to http://rob.acol.com/~cb/freeband.html)

  • Gap in list
    27.97 MHz
  • US Navy-MARS (according to http://rob.acol.com/~cb/freeband.html)

  • Gap in list
    28 - 29.7 MHz
  • Amateur (10 meter band) [Part 97]

  • Gap in list

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    This page written by John Neuhaus, WA2JXE <john@jneuhaus.com>. Please send me your comments and suggestions.
    Last update: 20 Jul 2015

    Disclaimer There is no warranty as to the accuracy or completeness of the information on these pages. All risk relating to its use is assumed by the user.