GMDSS Digital Selective Calling

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Global Maritime Distress and Safety System's Digital Selective Calling
DSC GMDSS.jpg
Frequencies 2187.5 kHzKiloHertz (kHz) 10^3 Hz2,187,500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
2.188 MHzMegaHertz (MHz) 10^6 Hz
,4207.5 kHzKiloHertz (kHz) 10^3 Hz4,207,500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
4.208 MHzMegaHertz (MHz) 10^6 Hz
,6312.0 kHzKiloHertz (kHz) 10^3 Hz6,312,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
6.312 MHzMegaHertz (MHz) 10^6 Hz
,8414.5 kHzKiloHertz (kHz) 10^3 Hz8,414,500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
8.415 MHzMegaHertz (MHz) 10^6 Hz
,12577.0 kHzKiloHertz (kHz) 10^3 Hz12,577,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
12.577 MHzMegaHertz (MHz) 10^6 Hz
,16804.5 kHzKiloHertz (kHz) 10^3 Hz16,804,500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
16.805 MHzMegaHertz (MHz) 10^6 Hz
,247.635 MHzMegaHertz (MHz) 10^6 Hz247,635,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
247,635 kHzKiloHertz (kHz) 10^3 Hz
2,187.5 kHzKiloHertz (kHz) 10^3 Hz
2.188 MHzMegaHertz (MHz) 10^6 Hz
247,635 kHzKiloHertz (kHz) 10^3 Hz
247.635 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 2.188 MHzMegaHertz (MHz) 10^6 Hz2,187,500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
2,187.5 kHzKiloHertz (kHz) 10^3 Hz
- 247.635 MHzMegaHertz (MHz) 10^6 Hz247,635,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
247,635 kHzKiloHertz (kHz) 10^3 Hz
Mode USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
Modulation FSKFrequency-Shift Keying
ACF
Bandwidth 350 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).0.35 kHzKiloHertz (kHz) 10^3 Hz
3.5e-4 MHzMegaHertz (MHz) 10^6 Hz
0.35 kHzKiloHertz (kHz) 10^3 Hz
3.5e-4 MHzMegaHertz (MHz) 10^6 Hz
0.35 kHzKiloHertz (kHz) 10^3 Hz
3.5e-4 MHzMegaHertz (MHz) 10^6 Hz
Location Worldwide
Short Description Global Maritime Distress and Safety System's Digital Selective Calling (GMDSS-DSC) is a maritime communication protocol intended to initiate ship-to-ship, ship-to-shore and shore-to-ship radiotelephone and MFMedium Frequency (300-3000 kHz)/HFHigh Frequency (3-30 MHz) radiotelex calls.
I/Q Raw Recording
Audio Sample
Global Maritime Distress and Safety System's Digital Selective Calling System is a maritime communication protocol using FSKFrequency-Shift Keying, quite similar to SITOR

and used on VHFVery High Frequency (30-300 MHz), MFMedium Frequency (300-3000 kHz) and HFHigh Frequency (3-30 MHz) marine bands. The full description of the protocol is described in ITU document M 493 while a comprehensive description is given in this PDF file.

This mode is derived from the CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R) 493-4 Selcall format.


Samples[edit]

HFHigh Frequency (3-30 MHz) DSC VHFVery High Frequency (30-300 MHz) DSC
DSC GMDSS.jpg
VHF GMDSS.jpg

Additional Samples:

HFHigh Frequency (3-30 MHz) DSC:



Frequencies[edit]

VHFVery High Frequency (30-300 MHz) Calling and urgency 156.525 MHzMegaHertz (MHz) 10^6 Hz VHFVery High Frequency (30-300 MHz) Channel 70

MFMedium Frequency (300-3000 kHz)/HFHigh Frequency (3-30 MHz) Distress and urgency 2187.5 kHzKiloHertz (kHz) 10^3 Hz, 4207.5 kHzKiloHertz (kHz) 10^3 Hz, 6312 kHzKiloHertz (kHz) 10^3 Hz, 8414.5 kHzKiloHertz (kHz) 10^3 Hz, 12577 kHzKiloHertz (kHz) 10^3 Hz, 16804.5 kHzKiloHertz (kHz) 10^3 Hz

MFMedium Frequency (300-3000 kHz)/HFHigh Frequency (3-30 MHz) Ship to ship calling frequencies 2177.0 kHzKiloHertz (kHz) 10^3 Hz, 4208.0 kHzKiloHertz (kHz) 10^3 Hz, 6312.5 kHzKiloHertz (kHz) 10^3 Hz, 8415.0 kHzKiloHertz (kHz) 10^3 Hz, 12577.5 kHzKiloHertz (kHz) 10^3 Hz, 16805.0 kHzKiloHertz (kHz) 10^3 Hz, 18898.5 kHzKiloHertz (kHz) 10^3 Hz, 22374.5 kHzKiloHertz (kHz) 10^3 Hz, 25208.5 kHzKiloHertz (kHz) 10^3 Hz

MFMedium Frequency (300-3000 kHz)/HFHigh Frequency (3-30 MHz) ship to shore duplex DSC channels (ship TXTransmit - ship RXReceive) 2189.5 - 2177.0 4208 - 4219.5 6312.5 - 6331.0 8415.0 - 8436.5 12577.5 - 12657.0 16805.0 - 16903.0 18898.5 - 19703.5 22374.5 - 22444.0


Decoding Software[edit]

Hobby Level Software


Professional Equipment/Software

Additional Links[edit]

Additional Images[edit]