Comtech EF Data CDM-625A Installation And Operation Manual page 587

CDM-625A Advanced Satellite Modem
Appendix F
F.5.2.2 Estimating PSD Ratio from Satmaster
F.5.2.3 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
PSD Ratio (in dB) = (Power
= CnC Ratio – 10 log (BW
If the two carriers have same Symbol Rate / Bandwidth, then the CnC Ratio is same as the PSD
Ratio.
(in dBm) – Power (in dBm)
C1 C2
– 10 log BW (in Hz)) – (Power
C1 C1
/ BW )
C1 C2
F–19
– 10 log BW (in Hz))
C2 C2
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MN-CDM625A