The 350 kg BSE was followed in 1984 and 1986 by the operational and essentially identical BS-2a and BS-2b satellites, respectively. Each spacecraft carried two active and one spare 100 W. 14/12 GHz transponder.
The 350 kg BSE was followed by the operational and identical BS-2a and BS-2b satellites in 1984 and 1986, each with two active and one spare 100 W 14/12 GHz transponders.