NDB Mys Taran Lt. *BT :

 

no recordings available

 

the german naval officer's handbook of 1951 listed it still as Germany: 'Brüsterort'; so maybe Soviet authorities took over call 'BT' unchanged from the Nazi authorities
but besides this strange listing you should watch the very precise description of the signal transmitted

 

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Callsigns:
BT

 

Frequencies Morse Telegraphy:
291.5
312.5