RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 

Go Back   The RadioReference.com Forums > HF / MW / LW Monitoring > Utility Listening


Utility Listening - Discussions regarding monitoring government, military, aircraft, ship, and other misc communications in the HF/MW/LF bands.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 03-21-2018, 6:42 PM
bearcat012's Avatar
Member
  Premium Subscriber
Premium Subscriber
 
Join Date: Oct 2007
Location: East Coast
Posts: 129
Default 10715 khz YL Numbers in Spanish

at 22:40 UTC, 10.715 MHZ, AM, YL with numbers and digital bursts in Spanish.
__________________
Semper Fidelis

Last edited by bearcat012; 03-21-2018 at 6:44 PM.. Reason: added mode
Reply With Quote
Sponsored links
  #2 (permalink)  
Old 03-21-2018, 7:04 PM
Wiki Admin Emeritus
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jul 2002
Location: Bowie, Md.
Posts: 21,263
Default

Enigma station HM01- the Cubans are at it again (heh)...Mike
__________________
co-author, HF Digital Decoding
HF Forum moderator, RadioReference
Friends don't let friends buy Scancat Lite Plus!
Reply With Quote
  #3 (permalink)  
Old 11-12-2018, 5:19 PM
GB46's Avatar
Member
   
Join Date: Feb 2017
Location: British Columbia, Canada
Posts: 201
Default

I'm hearing that number station right now at 22:14 UTC on 10715. Has anyone managed to decode those data bursts after every 5-digit group, or at least identified the digital mode used? The sound reminds me of the 57k baud modem I had back in the 90s for making dialup internet connections.

Some spy agency! They continue to use the same frequencies that have been widely known for years and are so predictable that they are listed in EiBi's shortwave schedules.

Their signal strength on my R75 is S9+10db, with very minor fading and clear audio. It's just as strong on my portable, too. This is with a 23 ft. reel antenna indoors on both receivers. Funny, but RHC never comes through that loud and clear, even though they're probably using the same transmitters..

Last edited by GB46; 11-12-2018 at 5:51 PM..
Reply With Quote
  #4 (permalink)  
Old 11-12-2018, 6:21 PM
Wiki Admin Emeritus
  Amateur Radio Operator
Amateur Radio
 
Join Date: Jul 2002
Location: Bowie, Md.
Posts: 21,263
Default

It's very likely RDFT, which is a mode associated exclusively to HM01. There is an app that supposedly decodes it, but from what I have heard, it's a bit dodgy and it's stability is not all that good. Even if you decode it, it's all letters and numbers, much like what the Russians (and others) do. A quick search of the UDXF logs confirms the guess.

Mike
__________________
co-author, HF Digital Decoding
HF Forum moderator, RadioReference
Friends don't let friends buy Scancat Lite Plus!
Reply With Quote
  #5 (permalink)  
Old 11-12-2018, 7:30 PM
GB46's Avatar
Member
   
Join Date: Feb 2017
Location: British Columbia, Canada
Posts: 201
Default

Quote:
Originally Posted by ka3jjz View Post
It's very likely RDFT, which is a mode associated exclusively to HM01. There is an app that supposedly decodes it, but from what I have heard, it's a bit dodgy and it's stability is not all that good. Even if you decode it, it's all letters and numbers, much like what the Russians (and others) do. A quick search of the UDXF logs confirms the guess.
So perhaps the data sequences are simply echoing the voice transmissions. I once tried copying out those number groups to see if any of them were repeated, but that was before the data streams were added, and there were more of the groups. I did manage to see entire sequences repeated.

To the uninitiated, sequences of letters and numbers are meaningless anyway, as are the codes read out on the US GHFS frequencies, but they do add a sense of mystery that makes SWLing more interesting. Come to think of it, I don't understand most of the languages used by the shortwave broadcasters, either, but it's still fun to hear them.
Reply With Quote
Sponsored links
  #6 (permalink)  
Old 11-12-2018, 8:08 PM
Member
   
Join Date: Jun 2010
Location: Mojave Desert, California, USA
Posts: 1,965
Default

Quote:
Originally Posted by ka3jjz View Post
It's very likely RDFT, which is a mode associated exclusively to HM01. There is an app that supposedly decodes it, but from what I have heard, it's a bit dodgy and it's stability is not all that good. Even if you decode it, it's all letters and numbers, much like what the Russians (and others) do. A quick search of the UDXF logs confirms the guess.
The software is called DIGTRX. I believe it was written for Windows XP. Under XP it is fairly stable, however there are issues running it under newer OS's.

RDFT was a ham mode before SK01, and later HM01, adopted it.

The HM01 files are encoded before being sent. DIGTRX will demodulate the transmittedfiles, but not decrypt them. So you end up with a txt file, but it is still encrypted. That is, assuming the Cubans did their tasking correctly. It is reported that on at least one instance SK01 (the predecessor to todays HM01) sent a message without encrypting first, so that the DIGTRX demodulated txt file contained real words.

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 5:25 PM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2018, 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