priyom.org

F01

Enigma ID ...

Name F01
Frequencies
Status Active
Voice N/A
Emission mode FSK, 200 bd, 500 Hz, ITA2 w/ 1.5 stop bits (ACF=15)
Location Russia, Cuba
Activity pages

Download audio sample

Known counterpart stations E06, E17, G06, S06, V06, V23, M14, F06

F01 is a Russian intelligence digital broadcast system, using a 200bd/500Hz/1.5sb ITA2 BFSK teleprinter. Its active counterparts are E06, G06, S06, M14 and F06.

Scheduling

F01 operates in regular schedules of three identical transmissions, spaced 10 minutes apart. The frequencies of the subsequent repeats decrease, usually by about 2 MHz. Two F01 schedules, with link IDs 00116 and 00117, are transmitted from Cuba.

Message format

The messages are 5-figure groups, and follow Russian intelligence common metadata formats. The messages of some of the schedules come with a common Russian 5-group header, using 11177 or sometimes 11100 as message type. All messages end with a serial number, group count postamble followed by a 00000 outro group. Some of the schedules also have the habit of sending a triple timestamp header at the beginning of the encrypted part of every message. Example message:

11177 00117 73158 18033 01169
99093 47317 82531 21292 64696 99409 51072 33287 16191 21460
73652 24396 46746 29967 87526 74711 80666 09058 70466 00626
52414 20103 40406 22727 51900 62024 99950 37049 48900 82256
21813 07721 41136 38663 52372 65680 22324 82385 72887 73539
08165 52212 56588 99347 01101 87530 66182 85439 68518 52907
60073 27071 33763 96959 81753 80773 46555 89396 64150 76681
68253 73551 81768 24773 33778 96464 54209 77544 65651 49527
17006 10258 63203 19266 74131 49111 02125 73501 58671 90239
80315 77709 80314 89051 30199 20073 97649 33803 71512 21327
45964 90417 90556 61041 52435 75627 57453 86347 13981 74298
55220 71563 21088 56492 32722 82621 60892 88554 89897 64535
76951 15590 66277 67513 33114 00000

Null messages simply consist of a single 00000 group, with no metadata.

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