this signal of ZZA could
be received daytime on nearby island of Menorca
as modulation reduces the
carrier power a little bit, there is also a so-called 'negative
keying', sounding as 'EUEF' (both: rb, 2013)
no pictures of QSLs or other info available
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Callsigns:
EUEF
ZZA
Frequencies Morse Telegraphy:
348