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M12

Enigma ID M12
Name
Frequencies
Status Active
Voice N/A
Emission mode CW
Location Moscow, Russia; Khabarovsk, Russia

Russian (icon)

Activity pages

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

Null format:

2 minutes
911 911 911 000
3-digit ID
(thrice)
 

Traffic format, single message:

2 minutes
903 903 903 1 8603 63 8603 63 27073 15164 ... 79261 48334 000 000
3-digit ID
(thrice)
Message
count
3-digit or
4-digit group
Group count 3-digit or
4-digit group
Group count 5-figure single groups  

Traffic format, two messages:

2 minutes           1 minute
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 ID
(thrice)
Message
count
3-digit or
4-digit group
Group count 3-digit or
4-digit group
Group count 5-digit single groups 3-digit ID
(thrice)
Message
count
3-digit or
4-digit group
Group count 3-digit or
4-digit group
Group count 5-digit single groups  

The intro and the outro are slower than the rest of the transmission. Zero is sent as "T" - a single dash.

In case of an unexpected interruption during the transmission, the station restarts with the intro, repeated for one minute, followed by the current message continued from some groups before the failure; the preamble is omitted.

Most M12 schedules are twice weekly and consists of 3 identical transmissions 20 minutes apart. Each successive transmission is 1-2 MHz lower or higher in frequency. The third transmission does not take place in case of a null message. The frequencies are typically changed on a monthly basis.