S18 was a rare Czech numbers station that had no set times or frequencies. It’s message format makes it seem like it could just be a control station or a test. It originally had a woman’s voice, but switched to a mans voice when it was reactivated in 2004 after a long period of absence.
Message Format
237 237 237 | 67004 67004 67004 | “Konec Konec” |
3-figure ID (Repeated 3x) |
5-figure message groups (Repeated 3x) |
|
Repeated 5x |
Numbers Station Summary
Nickname: Czech Lady / Czech Man
Activity: Inactive
Emission mode: USB?
Voice Summary: Originally had an automated man’s voice, then switched to female.
Believed Country of Origin: Czechoslovakia/Czech Republic
Family Relatives: S17, S19, M39(?)
Station Family: Family 9 Subfamily C “Czech”
Source
ENIGMA Active Stations List V1.3, Page 33