in this recording of *EYa-309.5 you
hear several times the callsign, and a long dash for direction
finding (rb, 2013)
see here the very detailed transmission scheme from the german
nautical officer's handbook of 1951
a PPC from the collection
of Patrick Robic (2000)
------------------------------------------------------------
Callsigns:
EYa
F
Frequencies Morse Telegraphy:
309.5
318.5