NDB Caslav-Chotusice-Centograf :

 

this station creates 2 signals, as it works like frequency shift keying, the real 'CF'...
...and the 'negative' 'ILE' image, both recorded by me in 2015 (rb)

 

QSL by PPC (Patrick Robic, 1999)

 

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Callsigns:
CF
IL
ILA
ILE

 

Frequencies Morse Telegraphy:
345.5