a recording from Andy Stumpf: CLS calling with low pitch, whereas
CUL is on high pitch (1987)
no pictures of QSLs or other info available
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Callsigns:
CLS
Frequencies Morse Telegraphy:
4328
4349
6360
6392
8489
8516
12878
12919
12954
13014
16921
17047
17175.2
17189.6
17237.9
22345.4
22578.5
22661