PTT Khartoum :

 

from the files of Hajo Russow: english & arabic male voice mirror (1969)

 

they used their own QSL-card for verification (Lars Lundström, 1972)

 

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Callsigns:
STL **

 

Frequencies Voice:
11525
13430
20800

 

Frequencies Radioteletype:
9220
11525
15710
18048
18084

 

Systems used:
50 Bd