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.
|237 237 237||67004 67004 67004||“Konec Konec”|
|5-figure message groups
Numbers Station Summary
Nickname: Czech Lady / Czech Man
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”
ENIGMA Active Stations List V1.3, Page 33