NDB Jönköping *OA :

 

a recording from 2020, using a swedish online receiver (rb)

 

Rudy van Dalen received this nice card in 1983
a QSL-letter from the collection of Patrick Robic (2000)
a letter similar to the above, and a detailed flightchart were sent to Dieter Pohlmann in 2009, showing *OA-338 and *OJ-403

 

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Callsigns:
OA

 

Frequencies Morse Telegraphy:
338