no recordings available
here is a multi-station-verification
letter (Willi Passmann, 1976)
these 2 approach charts for Amsterdam airport date from 1981...
...and have accompanied the QSL letter for Rudy van Dalen
a friendly verification letter from the files of Rudy van Dalen
(1982)
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Callsigns:
SPY
Frequencies Morse Telegraphy:
380
381