priyom.org

F06

Enigma ID F06

Spectrum image f06-spectrogram.png

Name
Frequencies
Status Active
Voice N/A
Emission mode BFSK, 200 Bd, 1000 Hz, ACF=288
Location Moscow, Russia; Orenburg, Russia; Chita, Russia; Havana, Cuba
Activity pages

Download audio sample

Known counterpart stations E06, E17, G06, S06, V06, V23, M14, F01

F06 is the main digital flavor of the Russian 6 operator. It utilizes a custom FSK mode.

Null format:

Preamble Message
11166 40133 95203 03001 00049 00000 00000 00000 00000
11166 (standard)
or 11100 (drill)
5-digit link ID 5-digit group Date (first 2 digits)
+ Serial (last 3 digits)
Group count (first 4 digits) + "9"
(always 00049)
 

Traffic format:

Preamble Message
11166 40133 35621 16018 00409 45491 95053 ... 04726 95605 18038 00000
11166 (standard)
or 11100 (drill)
5-digit link ID 5-digit group Date (first 2 digits)
+ Serial (last 3 digits)
Group count (first 4 digits) + "9" 5-digit single groups Serial (first 2 digits)
+ Group count minus 2 (last 3 digits)
 

The preamble is a minor modification of the format used on the Russian diplomatic links. The date consists of the day of the month only. The serial number ranges from 001 to 099 inclusive, increments by one with each successive message, and then wraps around.

Scheduling

F06 broadcasts consist of three transmissions spaced ten minutes apart. Each successive transmission is 1-3 MHz lower or higher in frequency. When traffic is sent, the three transmissions are also typically made the next day, at the same times and frequencies.

Ten minutes before the first transmission begins, a pre-transmission test is made, which consists of a variable number of "464646" ASCII bytes transmitted twice.

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