Aden Aero :
this is one the often-heard rtty test transmissions, series of 'ryry' with 50 baud speed (rb, 1985) just in case you have no decoder at hand ;-)
no pictures of QSLs or other info available
for more details from after 1990, look here
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Callsigns:
7OC
Frequencies Voice:
3467
5658
7595
11300
Frequencies Morse Telegraphy:
3850
3950
8115
15710
15730
15910
16245
17572
Frequencies Radioteletype:
5442
5680
5879
6765.5
7317
7340
7988
10780
11005
11395
11440
11541
11602
11640
14395
14440
17393
20060
Systems used:
50 Bd