priyom.org

M10

Enigma ID M10

Name
Frequencies
Status Inactive
Voice N/A
Emission mode ICW
Location Czech Republic
Activity pages

Known counterpart stations S10d

M10 was ran by Czech Military Intelligence (Czech: Vojenské zpravodajství). Morse code counterpart to S10d. Active since mid 1970s (multiple formats) until June 20th, 2007.

Format: (post-1990)

Intro Preamble Message Outro
555 630 26 630 88 26 = = 22681 22681 01927 01927 ... = = 88 26 0 0 0
3-figure arbitrary ID 3-figure recipient ID Amount of 5-figure groups in the message 3-figure recipient ID 2-figure number, purpose unknown Amount of 5-figure groups in the message   5-figure paired groups   2-figure number, purpose unknown Amount of 5-figure groups in the message  
Repeated thrice Repeated thrice   Repeated thrice Repeated twice Repeated twice       Repeated twice Repeated twice  
Repeated for 5 minutes                  

M10's intro, preamble and outro were sent at 15 WPM, while the message groups were at 20 WPM. Zero was sent as T - a single dash. M10 often sent more than one message in one transmission to more than one recipient. In that case, in the intro, the ID's and the group counts were included for all the messages, in the same way as the first one. Then the preamble, the message and the outro except "0 0 0" followed for each message. The last message ended the transmission with "0 0 0".

From 1990 to 2006, the arbitrary ID was only 555. Then from 2006 until the station's demise random triplets were used, but not 555 anymore.

M10 had a large amount of schedules at all times of day, which outnumbered those of S10d. On many schedules the messages were usually first sent in the morning, and repeated later in the evening. M10 could have started at any 5-minute interval within an hour, and was usually, but not always, transmitted on two frequencies in parallel.

From early 1980s until 1990, M10's format was slightly different - M10c. M10's format in 1970s was very similar to the last one - see S10.

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