S17 was a control numbers station that always sent the same ID’s of 555 and 313 then 42 and 05. “42” was possibly a decode key, and 05 indicates the amount of digits that were in each message group sent. The 5 digit group varied, but were related. This station was also originally nicknamed Bulgarian Betty.
|555 555 555||313 313 313||05||313 313 313||42 42||05 05||Pozor Pozor||99032||99032||99032||Pozor Pozor||42 42||05 05||Konec, Konec|
|Digits per message group||2-digit
|Possible decode key||Digits per message group||5-figure group, middle digit always “0”||Possible decode key||Digits per message group|
|Repeats for up to 5 minutes|
S17a was a variant that sent no call up or group indication. It was a control variant of S10d.
|313 313 313||99032||99032||99032||Konec, Konec|
|3-Digit ID||5-figure group, middle digit always “0”|
|Repeated for 5 minutes|
S17b was a variant that sent a message group with only one digit.
A variant that emitted in USB, not much else is known.
Numbers Station Summary
Nickname: Czech Lady
Emission mode: AM
Voice Summary: Automated woman’s voice.
Believed Country of Origin: Czechoslovakia/Czech Republic
Family Relatives: S18, S19, M39(?)
Station Family: Family 9 Subfamily C “Czech”
ENIGMA Newsletter #8 – S17 Nickname Bulgarian Betty, Page 9