Russian Intelligence 200bd 1000Hz FSK

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Russian Intelligence 200bd/1000Hz FSK
Russian Intelligence 200bd 1000Hz FSK.jpg
Frequencies 4 MHz,23 MHz
Frequency Range 4 MHz - 23 MHz
Mode USB
Modulation FSK
ACF
Bandwidth 1000 Hz
Location Russia
Short Description One-way error-correcting broadcast system, used by one of Russian intelligence agencies for delivery of messages to their operatives abroad on fixed schedules.
I/Q Raw Recording
Audio Sample

One-way error-correcting broadcast system, used by one of Russian intelligence agencies for delivery of messages to their operatives abroad on fixed schedules.

This system conveys encrypted, nameless binary files, with clear binary headers, stating the ID of the recipient, the date the message was written, its serial number, and its length. Its broadcasts often don't contain messages, and may also carry two messages in one broadcast.

This mode sends on fixed schedules, consisting of three broadcasts spaced 10 minutes apart. Each subsequent broadcast sends on a frequency lower between 500 kHzKiloHertz (kHz) 10^3 Hz and 3 MHzMegaHertz (MHz) 10^6 Hz, but typically it's 2 MHzMegaHertz (MHz) 10^6 Hz lower. Each transmission lasts 6-8 minutes, repeating the data continuously, and each repeat is followed by 256 zero bits.

Samples[edit]

Decoding software[edit]

Hobby Level Software
  • Rivet can partially decode this mode

See also[edit]