General Information
DSC (Digital Selective Calling) is part of the GMDSS (Global Maritime Distress and Safety System). It provides automatically formatted distress alerts, urgency, safety and routine radio-telephone calls.
Usage:
§ Data communication over HF / VHF.
§ Initiation of radiotelephone and MF/HF radio telex calls.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
FSK |
|
|
Number of tones |
2 |
|
|
Shift (Hz) |
170 |
|
|
Bandwidth (Hz) |
500 |
|
|
Symbol rate (Baud) |
100 |
|
|
Coding |
Checksum |
|
Demodulator Settings |
Demodulator |
FSK 2 matched |
|
|
Symbol rate (Bd) |
100 |
|
|
SR tolerance (Bd) |
10 |
|
|
Shift (Hz) |
170 |
|
|
Shift tolerance (Hz) |
10 |
|
|
Modem type |
Synchronous |
|
Features |
Demodulation |
yes |
|
|
Recognition |
yes |
|
|
Decoding |
yes |
|
|
Automatic Polarity Adjustment HF |
no |
|
|
Combination with other modems (modem list) |
yes |
|
Tuning |
The tuning frequency is the center of the signal | |
|
Frequencies: |
2187.5 kHz 4207.5 kHz 6312.0 kHz 8414.5 kHz 12577.0 kHz 16804.5 kHz | |
Table 105: DSC HF
Figure 37: DSC HF Spectrogram