Yet another interesting STANAG-4481F signal, this time operated in async 5N1.5 mode and in cleartext(!): first time I see a not encrypted S-4481F transmission (obviously except FABs/CARBs). Signal spotted on 11123.55 KHz (CF) at 2220Z a few days ago (24th Dec) thanks to the AI6VN/KH6 KiwiSDR at Kahakuloa, Maui, HI.
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| Fig. 1 |
Curiously, since the poor quality of the signal, the bitstream sometimes appears as 5N1 and sometimes as 5N2 (Figure 2).
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| Fig. 2 - 5N1 and 5N2 bitstreams |
The decoded text concerns the AOMSW exercise in the Arabian Gulf on December 21 [1] and since the title ("Navy News Stories of the day" ) and the text, I think it's probably a kind of "press review" for the fleet at sea.
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| Fig. 3 - decoded text |
Don't know which USN/NATO station operates on that frequency (11223.55 KHz, CF) and unfortunately I went late on that transmission so I didn't have time to DF the signal.
[1] https://www.centcom.mil/MEDIA/NEWS-ARTICLES/
https://yadi.sk/d/ZWGnhaEtwStUmQ
https://yadi.sk/d/rkR8ritYr1C_bQ
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