Comtech EF Data CST-5000 - Manual (Page 127)

140 MHz IF Option CST-5000 C-Band Satellite Terminal
A–8 Rev. 9
A.1.4 Up Converter
The function of the up converter is to convert the 140 MHz IF signal used in the indoor
unit modem to a C-Band signal sent to the HPA.
Refer to Figure Appendix A-4 for a functional block diagram of the up converter.
Figure Appendix A-4. Up Converter Block Diagram