A variety of factors in a satellite link will contribute to and affect phase noise:
✓ Phase lock reference for BUC/LNB
✓ PLL LNB design
✓ Loop bandwidth
✓ Power supply noise
✓ Grounding (electronics, cables and antenna structure)
✓ 20 Log(n)
Some of these factors can be minimized through proper selection of subsystem equipment (stated/tested specs from the BCC and LNB manufacturers). Some can be mitigated through good engineering practices and careful site installation (proper grounding in particular). One of the most important contributing factors is the stability of the oscillator that is generating the timing reference for any equipment with a frequency conversion stage (BCC or LNB).