SAS2

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SAS2
SAS2 mod pattern 2.gif
Frequencies 42.5 kHzKiloHertz (kHz) 10^3 Hz42,500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.0425 MHzMegaHertz (MHz) 10^6 Hz
42.5 kHzKiloHertz (kHz) 10^3 Hz
0.0425 MHzMegaHertz (MHz) 10^6 Hz
42.5 kHzKiloHertz (kHz) 10^3 Hz
0.0425 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 42.5 kHzKiloHertz (kHz) 10^3 Hz42,500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.0425 MHzMegaHertz (MHz) 10^6 Hz
- 42.5 kHzKiloHertz (kHz) 10^3 Hz42,500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.0425 MHzMegaHertz (MHz) 10^6 Hz
Mode
Modulation MSKMinimum-Shift Keying (When Shift/Bd = 0.5. It is impossible to get this ratio to be lower than 0.5, hence it is called the 'Minimum' shift.)
ACFAutoCorrelation Function
Location Varberg, Sweden
Short Description Swedish navy transmitter for submarine communication
I/Q Raw Recording
Audio Sample

SAS2 is activated less often as the other Swedish transmitters used for VLFVery Low Frequency (3-30 kHz) submarine communication. Usually, it works with reduced power.

Swedish MSKMinimum-Shift Keying (When Shift/Bd = 0.5. It is impossible to get this ratio to be lower than 0.5, hence it is called the 'Minimum' shift.) transmitters can easily be identified in the waterfall diagram by their fishbone-like modulation pattern. This seems to belong to the idle phases where no data are transmitted.

The fishbone pattern is even audible as a characteristic modulation.