|Name||Czech Lady "Control"|
|Known counterpart stations|
S17b was run by the Czech military intelligence. The language was Czech. It was a variant of S10d that always conveyed a single group message.
|555||555||555||589||589||589||01||589||589||589||18||18||01||01||Pozor, Pozor||44447 44447||Pozor, Pozor||18||18||01||01||Konec, Konec|
|3-figure arbitrary ID, identical in each transmission||3-figure recipient ID||Group count, always "01", indicating one group||3-figure recipient ID||2-figure number, purpose unknown||Group count, always "01", indicating one group||One 5-figure paired group||2-figure number, purpose unknown||Group count, always "01", indicating one group|
|Repeated for 5 minutes|