Enigma ID S11a

Spectrum image e11a_spectr

Name Cherta
Frequencies Several frequencies spanning 4 to 19 MHz
Status Active
Voice Female, automated, with Polish accent
Emission mode USB
Location Poland
Activity pages

Download audio sample

Known counterpart stations E11, G11, S11, M03, F11

Run by one of Polish intelligence agencies. Its active counterparts are E11, and F11. Its defunct counterparts are G11, S11, and M03.

Non-traffic format:

371 Cherta 00 Konets
3-figure ID / No groups  
Repeated for 3:18-3:25 minutes  

Traffic format:

Intro Message Outro
420 Cherta 38 Vnimaniye 49468 49468 ... 08682 08682 Vnimaniye 49468 51422 ... 53682 08682 Konets
3-digit ID / Group count   5-digit paired groups,
pause every 10 pairs
  Single group repeat,
pause every 10 groups
Repeated for 3:18-3:25 minutes          

The voice uses Polish phonetic pronunciation:

0 1 2 3 4 5 6 7 8 9 * / +
Nul Adinka Dwojka Trojka Cienciorka Pietiorka Szest Siem Wosiem Diewiet Wnimanie Cirta Kaniec


All S11a schedules are weekly, follow year-round UTC (no DST adjustments), and use three different frequencies depending on the month - one for November to February, one for May to August and one for the remaining months. For most of the time there is no traffic, and one random week of the month a message is sent that always consists of 30-38 groups. Those always have a repeat transmission in the same week.

Most schedules are preceded by a digital transmission that delivers the same message that would later be sent in voice, on a nearby frequency.

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