RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 

Go Back   The RadioReference.com Forums > HF / MW / LW Monitoring > Shortwave Data Decoding


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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 08-13-2017, 2:32 PM
Newbie
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
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

https://youtu.be/9y7Owi8AYwU
Reply With Quote
Sponsored links
  #2 (permalink)  
Old 08-13-2017, 3:30 PM
Wiki Admin Emeritus
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jul 2002
Location: Bowie, Md.
Posts: 20,487
Default

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 groups.io 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.

Mike
__________________
links editor, Utility Monitoring Central
HF Forum moderator, RadioReference
Friends don't let friends buy Scancat Lite Plus!

Last edited by ka3jjz; 08-13-2017 at 5:07 PM..
Reply With Quote
  #3 (permalink)  
Old 08-13-2017, 6:26 PM
Newbie
  Premium Subscriber
Premium Subscriber
Amateur Radio Operator
Amateur Radio
 
Join Date: Aug 2007
Location: Juneau, Alaska
Posts: 3
Default

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.
Reply With Quote
  #4 (permalink)  
Old 08-14-2017, 10:05 AM
Member
   
Join Date: Jun 2010
Location: Mojave Desert, California, USA
Posts: 1,874
Default

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.

T!
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 5:26 PM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
All information here is Copyright 2012 by RadioReference.com LLC and Lindsay C. Blanton III.Ad Management by RedTyger
Copyright 2015 by RadioReference.com LLC Privacy Policy  |  Terms and Conditions