Block Up Converter, C-Band
A Block Up-Converter (BUC) is an electronic device converting the modulated signals, originating from the Indoor Unit (IDU), from L-Band to the satellite frequency band, as needed, and amplifying the frequency converted signals. The BUC is mounted near the feed of the antenna which transmits the signals from the VSAT to the satellite.
C-Band ranges from 4 to 8 GHz. It was the original frequency allocation for telecommunications satellites and is still largely used today. Standard C-Band satellites use the frequency range from 5.925 to 6.425 GHz for uplink - from earth to satellite.