Trieste Radio :

 

a recording of IQX telegraphy, made by Andy Stumpf, 1987

 

nice QSL letter (Martin Foltz, 1975)
this card was used in late 1970's (Willi Passmann)
QSL letter with many technical details (Frank Schüttig, 1994)
very detailed letter, with additional info on remote controlled stations (Udo Rostalski, 1994)

 

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Callsigns:
IQX
U

 

Frequencies Voice:
2182
2624
2656

 

Frequencies Morse Telegraphy:
429
500
512.5
524.5
4296
6418
6421
8502
8679
12975
17084

 

Frequencies Radioteletype:
518

 

Systems used:
SITOR