priyom.org

M12

Enigma ID M12

Name
Frequencies
Status Active
Voice N/A
Emission mode ICW
Location Russia
Activity pages

Download audio sample

Known counterpart stations E07, G07, S07, V07, XP, XPA, XPA2, XPH

Null format:

911 911 911 000
3-figure transmission ID  
Repeated for 2 minutes

Traffic format:

Intro Preamble Message Outro
903 903 903 1 8603 63 27073 15164 79261 ... 48334 000 000
3-figure transmission ID, repeated thrice Amount of messages in the transmission 3- or 4-figure group, purpose unknown Amount of 5-figure groups in the message 5-figure single groups  
Repeated for 2 minutes Repeated twice    

Traffic format, two messages:

Intro Preamble Message Intro Preamble Message Outro
124 124 124 2 4582 132 4582 132 67540 37492 ... 19241 81259 124 124 124 2 8248 112 8248 112 94213 70216 ... 03679 52901 000 000
3-digit schedule ID Message count 3- or 4-digit group,
purpose unknown
Group count 3- or 4-digit group,
purpose unknown
Group count 5-digit single groups 3-digit schedule ID Message count 3- or 4-digit group,
purpose unknown
Group count 3- or 4-digit group,
purpose unknown
Group count 5-digit single groups  
Repeated for 2 minutes           Repeated for 1 minute            

The intro and the outro are sent at 17 WPM, while the rest depends on the schedule - anywhere between 22 and 30 WPM. Zero is sent as "T" - a single dash.

Operation habits

M12 operates in regular schedules of three identical transmissions, spaced 20 minutes apart. The first transmission can take place at any 10-minute interval within an hour, but most commonly it's either the full hour or half hour. If the first transmission took place before 12:00 UTC, the frequencies of the subsequent repeats increase - otherwise they decrease. If the transmission is too long to fit into the 20-minute frame, it continues, then the subsequent repeat is started as soon as possible.

M12 has two types of schedules - those with the same ID, frequency set and time throughout the year, and no null messages - and those with ID and frequency set changing monthly, and the time adjusting for daylight saving. On the latter type, the transmission ID and the frequencies used are correlated - putting together the hundredths digits from the frequencies, from first transmission to last, gives the ID.

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