here a recording made in
2011 close to the belgian border (rb)
this letter confirms the reception of NDBs WW-309
and ONW-355 to Bernhard Hein (2009)
see here the picture from the above letter in original size
here seems to be a new/renamed operations
agency (Patrick Robic, 2022)
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Callsigns:
ONW
Frequencies Morse Telegraphy:
355
359