S17c
| Enigma ID | S17c |
| Name | Czech Lady "Control" |
| Frequencies | |
| Status | Inactive |
| Voice | Female, automated |
| Emission mode | USB |
| Location |
Czechoslovakia
|
| Activity pages |
S17c was run by the Czech Military Intelligence (Czech: Vojenské zpravodajství). Last heard on 19 June 2007.
Transmission format:
| Intro | Preamble | Message | Outro | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 555 | 313 | 05 | 313 | 42 | 05 | Pozor, Pozor | 52027 | Pozor, Pozor | 42 | 05 | Konec, Konec |
| 3-figure arbitrary ID | Single 5-figure group, middle digit always "0" | ||||||||||
| Repeated thrice | Repeated thrice | Repeated thrice | Repeated twice | Repeated twice | Repeated 10 times | Repeated twice | Repeated twice | ||||
The general format was the same as S10d, but the recipient ID, the 2-figure number in the preamble and the amount of groups were constant.
S17c was sent out daily at 12:50 UTC, and each transmission lasted about 7 minutes. Up until 1 February 2007, it was transmitted on two frequencies simultaneously, and on only one frequency afterwards. Until 2 February 2007, the arbitrary ID was only 555 - then until the station's demise, random triplets were used, but never 555.