Comtech EF Data Vipersat SLM-5650A, Installation And Operation Manual

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SLM-5650A Satellite Modem
Revision 10
Appendix H G–22 MN-SLM-5650A
G.4.2.2 Estimating PSD Ratio from Satmaster
G.4.2.3 Estimating PSD Ratio Using Spectrum Analyzer
PSD Ratio or CnC Ratio can also be estimated using a Spectrum Analyzer capable of integrating
the signal power in a given bandwidth.
CnC Ratio (in dB) = Power
C1
(in dBm) – Power
C2
(in dBm)
PSD Ratio (in dB) = (Power
C1
– 10 log BW
C1
(in Hz)) – (Power
C2
– 10 log
BW
C2
(in Hz))
= CnC Ratio – 10 log (BW
C1
/ BW
C2
)
If the two carriers have same Symbol Rate / Bandwidth, then the CnC Ratio is same as the PSD
Ratio.