Saratov Aero :

 

listen to 'Torba', as picked up by Rudy van Dalen in 2006

 

see this prepared card from the collection of Patrick Robic (2020)

 

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Callsigns:
Torba

 

Frequencies Voice:
3245
3815
4169
4712
4755
5025
5568
7870

 

.