SAS/SRC
From Signal Identification Wiki
 | |
|---|---|
| Frequencies | 40.4 kHz |
| Frequency Range | 40.4 kHz - 40.4 kHz |
| Mode | — |
| Modulation | MSK |
| ACF | — |
| Emission Designator | — |
| Location | Sweden |
| Short Description | Swedish navy transmitter for submarine communication. It shares the antenna with SAQ (Grimeton Radio) |
| I/Q Raw Recording | — |
| Audio Sample | |
SAS is the military part of the Varberg site. It shares the antenna with SAQ (Grimeton Radio) https://www.sigidwiki.com/wiki/Grimeton_Radio_(SAQ).
So if SAQ is going to start one of its rare transmissions, SAS is turned off one or two days before.
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 while the pattern becomes more random while transmitting data.
