a recording via an internet
Kiwi SDR (rb, 2020)
interesting letter, confirming *OU-322, and advising to receive
*NAK-335 and *NB-394
(Rudolf Renkwitz, 1993)
another interesting QSL letter
to Patrick Robic (2001), also mentioning *NAK-335
and *NB-394
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Callsigns:
OU
Frequencies Morse Telegraphy:
322