This is a medium sized 50 Watt KU-Band BUC, with a frequency range of 14 Ghz to 14.5 GHz. The amplifier is an SSPA with a BUC frequency converter built in. This combination if often called an SSPB.
The BUC is designed to operate outside on the antenna, and has the necessary environmental hardening. Because the BUC can be mounted close to the antenna feed, long runs of expensive waveguide are not required.
The full Vertex model is PKM14S50A and has been tested to work well across the entire frequency range.