PTT Khartoum :

 

in this recording from Paul Hawkins you hear Khartoum calling for London (ca 1968)
from the files of Hajo Russow: english & arabic male voice mirror (1969)

 

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

 

------------------------------------------------------------

 

Callsigns:
STL **

 

Frequencies Voice:
11525
13430
20800

 

Frequencies Radioteletype:
9220
11525
15710
18048
18084

 

Systems used:
50 Bd