nice historic recording of
a voice mirror for the fixed aeronautical service (Hajo Russow,
1967)
very detailed QSL letter (Michael Oexner, 1990)
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Callsigns:
8BB **
Frequencies Voice:
3416
3470
3474
4495
4555
5340
5596
5598
5631
6556
6595
6659
6921
8820
8861
8882
8957
9055
10066
11309
11366
11396
13309
13318
17907
Frequencies Radioteletype:
6926
6936
6969
10190
11932
13375
14374
14472
14872
Systems used:
50 Bd