priyom.org

F11

Enigma ID F11

Name
Frequencies
Status Active
Voice N/A
Emission mode USB; BFSK, 100Bd/620Hz, ACF=16
Location Poland
Activity pages

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Known counterpart stations E11, G11, S11, S11a, M03, F03, P03

F11 is a Polish 11 digital mode that was introduced in late 2000s. It is not run as a standalone mode, but instead it is attached to E11 schedules, sending the same traffic 15 minutes beforehand.

Formerly seen attached to most E11, S11a, and M03 schedules, in mid 2010s it was rendered largely obsolete by the newer F03/P03 modem which operates standalone.

Scheduling

All F11 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 20-50 groups (excluding "88888"). Those always have a repeat transmission in the same week.

Each F11 transmission is followed 5 minutes later by a repeat of it on the same frequency. 10 minutes after the repeat, an E11 or S11a transmission comes up, carrying the same message, always on a nearby frequency, normally up to 1 MHz away. However, not every single analog schedule has a digital equivalent.

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