GMDSS Digital Selective Calling

From Signal Identification Wiki
Jump to: navigation, search

Global Maritime Distress and Safety System's Digital Selective Calling
DSC GMDSS.jpg
Frequencies 2.1875 MHz,4.2075 MHz,6.312 MHz,8.4145 MHz,12.577 MHz,16.8045 MHz,2.177 MHz,156.525 MHz
Frequency Range 2.177 MHz - 156.525 MHz
Mode USB
Modulation FSK
ACF
Emission Designator
Bandwidth 350 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 MF/HF 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 kHzKiloHertz (kHz) 10^3 Hz
  • 4208 - 4219.5 kHzKiloHertz (kHz) 10^3 Hz
  • 6312.5 - 6331.0 kHzKiloHertz (kHz) 10^3 Hz
  • 8415.0 - 8436.5 kHzKiloHertz (kHz) 10^3 Hz
  • 12577.5 - 12657.0 kHzKiloHertz (kHz) 10^3 Hz
  • 16805.0 - 16903.0 kHzKiloHertz (kHz) 10^3 Hz
  • 18898.5 - 19703.5 kHzKiloHertz (kHz) 10^3 Hz
  • 22374.5 - 22444.0 kHzKiloHertz (kHz) 10^3 Hz


Decoding Software[edit]

Hobby Level Software


Professional Equipment/Software

Additional Links[edit]

Additional Images[edit]