SAS/SRC

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SAS
SAS-SRC mod pattern.gif
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
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.