|Location||Moscow, Russia; Khabarovsk, Russia|
|Known counterpart stations||E07, G07, S07, V07, XP, XPA, XPA2, XPB, XPH|
M12 is the Morse code flavor of the Russian 7 operator.
|3-digit schedule ID|
|Repeated for 2 minutes|
Traffic format, single message:
|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 or more messages:
|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|
|For the first message||For each further message|
The intro, the interlude, and the outro are sent at a slower speed than the rest of the transmission: 75 ms per unit. There are several speeds available for the preamble and the message: 60, 50, or 43.75 ms per unit; the speed is fixed on a per schedule basis. 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.
The standard M12 schedules are twice weekly, and consist of three transmissions spaced twenty minutes apart. Each successive transmission is 1-2 MHz lower or higher in frequency. The third transmission doesn't take place in case of a null message. The frequencies usually change monthly.