listen to this recording from the collection of Willi Passmann
friendly verification letter (Frank Schüttig, 1978)
another nice letter from 1978 (Willi Passmann)
nice and detailed QSL-card with letter, from 1982 (rb)
a rather recent QSL from
the colllection of Fabricio Andrade Silva (2011)
look at their homepage
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Callsigns:
HCHD2
HD2IOA
Frequencies Voice:
3810
5000
7600