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