this is a recording from the longwave signal RTZ on 50 kHz, made
by Klaus Betke
here is a QSL letter from 1994 (Patrick Robic)
just a few months later, this card was sent to Ary Boender
often the time signal stations Moscow
and Irkutsk used the same card - check it out!
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Callsigns:
RID (shortwave)
RTZ (longwave)
Frequencies Morse Telegraphy:
50
5004
10004
15004