GMDSS Digital Selective Calling
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.Dead link
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 |
---|---|
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
- DSC Decoder
- GMDSS Decoder for IPhone / Ipad
- MultiMode Cocoa
- MultiPSK
- SeaTTY
- Yet Another DSC Decoder (YADD), in the list of links to software
- Professional Equipment/Software
Additional Links[edit]
- These links come from the UDXF Website
- General Information on Digital Selective Calling
- GMDSS Information
- Wikipedia DSC
- RadioRaft GMDSS-DSC
- MultiPSK GMDSS DCS
- WAVECOM Decoder Online Help