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Shortwave Data Decoding - Discussions regarding decoding digital signals on the HF bands, including HFDL, ALE, RTTY, CW, and others.

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Old 08-13-2017, 3:32 PM
  Amateur Radio Operator
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Join Date: Aug 2007
Location: Juneau, Alaska
Posts: 3
Default 13.868 Secured Rtty?

Can someone help identify this? I was thinking a WEFAX, but it won't decode -- is it Military secure RTTY? -- I searched for the source of this specific frequency but couldn't find a 'frequency database'

I'm in Southeast Alaska
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Old 08-13-2017, 4:30 PM
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  Amateur Radio Operator
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Location: Bowie, Md.
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There are numerous logs in the UDXF that suggest this might be the Russian Navy (maybe FSK 200/1000, but you never know - they like to throw in some CW too, just for good measure). This group allows you to search their logs with a simple search feature, which is not always up to par, but probably as close as you can get. It can be found at the website

If it is the Russian Navy and running one of their famous FSK variants, there is software called Rivet that might decode it - however the content is largely unknown; you may be able to read callsigns and trace network details, but you likely won't understand the message. A lot of that is encrypted, and there are several UDXF folks that are actively working to understand these networks. The link for the software can be found on the page found on my sig line.

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Last edited by ka3jjz; 08-13-2017 at 6:07 PM..
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Old 08-13-2017, 7:26 PM
  Amateur Radio Operator
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Location: Juneau, Alaska
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Thank you for pointing me to this group! The signal is there consistantly, I'd like to know where it is so I can judge how propagation is behaving.
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Old 08-14-2017, 11:05 AM
Join Date: Jun 2010
Location: Mojave Desert, California, USA
Posts: 1,969

This is 850 Hz shift FSK, 50 bd, and it does appear to be encrypted. The center frequency is 13870 kHz.

US / NATO, Russia, and France all use different types of 850 Hz shift encrypted FSK. Further, at one time or another all three systems have been reported on this frequency, whether in error or not I do not know. At a guess it is Russian, but it could be US also. The direction from my location would suggest US or European Russia, not Far East / Asiatic Russia. US/NATO STANAG 4481 FSK normally does 75 bd with the same shift, but I have been seeing a lot of 50 bd stuff on known US freqs.

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