a recent recording by Nils Schiffhauer (2011)
this ppc confirms a fixed circuit in telegraphy (Lars Lundström,
1978)
here is a QSL by short letter and PPC from 1986 (rb)
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Callsigns:
D2U
Frequencies Voice:
2851
2854
2878
3461
5493
5547
5568
6559
6622
8846
8888
8894
8903
8913
13294
Frequencies Morse Telegraphy:
10132
11575
11580
13500
17367
Frequencies Radioteletype:
3162
4915
5455
5800
8098.5
9117
9853.5
10353.5
11128
12030
12142
14603
18227
Systems used:
50 Bd