BTA Sofia :

 

no recordings available

 

in 1981, Joop Balneger received this friendly letter
Dieter Pohlmann received a detailed letter in 1987, presenting the actual transmission schedule

 

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Callsigns:
LZA*
LZB
LZD9
LZF5
LZG*
LZH*
LZI
LZN3
LZP*

 

Frequencies Radioteletype:
3253
3331
4525
4526
5457
6895
6960
7460
8055
9472
11110
11502
13400
14920
15555
16115
18211
20630

 

Systems used:
50 Bd