no recordings available
see here the detailed operation schedule of 1951, and an overview
chart of NDBs active so long ago (copyright BSH Germany)
an interesting letter, confirming
reception of both Blavandshuk and Hanstholm
light houses (Rudy van Dalen, 1983)
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Callsigns:
HM
Frequencies Morse Telegraphy:
296.5
300.5