a recording from 2004, with
a little extra-dot, indicating the use of reserve-system (rb)
see this QSL from 2002 (Dieter Pohlmann)
in 2019, Michael Oexner visited the 2 NDBs from Saarbrücken
airport, *SBN-343 and *SR-360
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Callsigns:
SBN
Frequencies Morse Telegraphy:
343