HF marine

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(MF SSB and HF SSB marine bands)
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[[File:SEA_209_HF_MARINE.jpg|400px|thumb|left|SEA 209 2/4/6/8 MHz MF-SSB/HF-SSB marine transceiver - note the band switch + channel selector + clarifier or clarify (fine tune) control (labelled as ''clarity'' on this radio) combination with frequency display, similar to how export [[CB]] radios operate]]
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[[File:SEA_209_HF_MARINE.jpg|400px|thumb|left|SEA 209 2/4/6/8 MHz MF-SSB/HF-SSB marine transceiver - note the band switch + channel selector + clarifier or clarify (fine tune) control (labelled as ''clarity'' on this radio) combination with frequency display, similar to how export [[CB]] radios operate.  This particular radio only covers the lower MF/HF SSB marine bands, 2 MHz, 4 MHz, 6 MHz and 8 MHz marine bands]]
[[File:SEA_235_HF_MARINE.jpg|400px|thumb|left|SEA 235 2-30 MHz MF-SSB/HF-SSB marine transceiver]]
[[File:SEA_235_HF_MARINE.jpg|400px|thumb|left|SEA 235 2-30 MHz MF-SSB/HF-SSB marine transceiver]]

Revision as of 18:03, 10 July 2019

HF-SSB marine bands - these are standardized maritime mobile MF and HF communications bands - note that many maritime mobile users operate outside of these bands and there are dozens of country- or region-specific additional bands/frequencies. These bands are used for USB voice transmissions, various data modes including FAX used for Maritime Fax Transmissions, FSK, modes for various purposes as well as USB voice and RTTY weather and emergency broadcasts to ships at sea.

Fisheries, fishing boats, and other commercial marine users will often use frequencies in the HF aeronautical or aircraft bands (including the 6525 kHz to 6685 kHz and 6685 kHz to 6765 kHz military aircraft 6 MHz subbands 6525 kHz to 6765 kHz), other HF aircraft bands, fixed/mobile band (including 43 meters - 6765-7000 kHz) clear frequencies in the shortwave broadcast bands or even amateur frequencies for "out of band" communications to reduce the chance of radio interception by their competition. Out of band frequencies are also used in other ITU regions for marine fax transmissions.


See also: VHF marine band

MF-SSB and HF-SSB marine traffic (usually in the bands above 4 MHz) can be in simplex or semi-duplex for voice and/or data. Cross-band operation is also allowed per ITU regulations. Often you will hear ship-to-ship communications in simplex mode on the "ship transmit" frequency of a duplex pair.

MF SSB and HF SSB marine bands

Band Frequency Range
405-525 kHz MF band, used in some areas for NAVTEX on 490 kHz and/or 518 kHz. 500 kHz or 500 kc (600 meters) was the original CW Morse code calling frequency
1600-2000 kHz MF band, used in Europe and elsewhere (also used heavily for fishnet beacons) - overlaps with 1800-2000 kHz 160 meter amateur band
2000-2300 kHz MF 2 MHz marine band - USB voice calling/distress 2182 kHz, DSC calling/distress 2187.5 kHz - USCG no longer monitors 2182 kHz USB
2450-2850 kHz MF 2 MHz marine band, USB voice and FSK modes, some AM voice heard here in Russia, Eastern Europe and Asia (older-generation trawler radios 2-3 MHz)
4000-4063 kHz 4 MHz fixed/mobile band, shared with marine for simplex purposes, can be paired cross-band with 8 MHz
4063-4438 kHz HF 4 MHz marine band - USB voice calling/distress 4125 kHz, DSC calling/distress 4207.5 kHz
6200-6525 kHz HF 6 MHz marine band - USB voice calling/distress 6215 kHz, DSC calling/distress 6312 kHz
8000-8195 kHz 8 MHz fixed/mobile band, shared with marine for simplex purposes, can be paired cross-band with 4 MHz
8195-8815 kHz HF 8 MHz marine band - USB voice calling/distress 8291 kHz, DSC calling/distress 8414.5 kHz
12330-13200 kHz HF 12 MHz marine band - USB voice calling/distress 12290 kHz, DSC calling/distress 12577 kHz
16460-17360 kHz HF 16 MHz/17 MHz marine band - USB voice calling/distress 16420 kHz, DSC calling/distress 16804.5 kHz
22000-22855 kHz HF 22 MHz marine band
25070-25121 kHz HF 25 MHz marine band
26145-26175 kHz HF 26 MHz marine band
26175-30000 kHz Various CB-like marine allocations found in this region (many SSB marine radios stop at 27500 kHz or 27.5 MHz)
SEA 209 2/4/6/8 MHz MF-SSB/HF-SSB marine transceiver - note the band switch + channel selector + clarifier or clarify (fine tune) control (labelled as clarity on this radio) combination with frequency display, similar to how export CB radios operate. This particular radio only covers the lower MF/HF SSB marine bands, 2 MHz, 4 MHz, 6 MHz and 8 MHz marine bands
SEA 235 2-30 MHz MF-SSB/HF-SSB marine transceiver
ICOM IC-M802 2-30 MHz MF-SSB/HF-SSB marine transceiver

See also:

  • [1] HF marine distress and calling frequencies
  • [2] US Coast Guard MF and HF SSB marine radiotelephone frequency channel list (duplex and simplex)
  • [3] US Coast Guard MF & HF 2-26 MHz marine SSB channel information
  • [4] Marine Safety Broadcasts MF, HF, VHF and SATCOM broadcasts and services