priyom.org

M12

Enigma ID M12

Name
Frequencies
Status Active
Voice N/A
Emission mode ICW
Location Moscow, Russia; Khabarovsk, Russia
Activity pages

Download audio sample

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

M12 is the Morse code flavor of the Russian 7 operator.

Null format:

911 911 911 000
3-digit schedule ID  
Repeated for 2 minutes

Traffic format, single message:

Intro Preamble Message Outro
903 903 903 1 8603 63 27073 15164 79261 ... 48334 000 000
3-digit schedule ID Message count 3- or 4-digit group Group count 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 67540 37492 ... 19241 81259 124 124 124 2 8248 112 94213 70216 ... 03679 52901 000 000
3-digit schedule ID Message count 3- or 4-digit group Group count 5-digit single groups 3-digit schedule ID Message count 3- or 4-digit group Group count 5-digit single groups  
Repeated for 2 minutes Repeated twice   Repeated for 1 minute Repeated twice    

The intro and the outro is sent much slower than the rest of the broadcast. There are several different, but similar speeds for the other sections. 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 the 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 the schedule ID and the frequencies changing monthly. On the latter type, the transmission ID and the frequencies used are correlated - putting together the hundreds digits from the frequencies, from first transmission to the last, gives the ID.

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