here a recording made in
2011 close to the belgian border (rb)
this letter confirms 4 reports
of Dieter Pohlmann from 2000, namely *OB-293,
*ONC-323, *MAK-360.5,
and *DEN-393
see here the PPC for this
station (Dieter Pohlmann, 2000)
look at this picture from
Michael Oexner's NDB Handbook from 2010
------------------------------------------------------------
Callsigns:
OB
Frequencies Morse Telegraphy:
293