NDB Heringsdorf *HC :

 

a recording from 2013, also revealing SB from Sonderborg, Denmark in the background (rb)

the antenna of HC on the baltic island of Usedom (Klaus Betke)
Dieter Pohlmann received this verification by PPC in 2001

 

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Callsigns:
HC

 

Frequencies Morse Telegraphy:
330