Comtech EF Data CDM-625A - Manual (Page 625)

CDM-625A Advanced Satellite Modem MN-CDM625A
Appendix F Revision 3
F–19
F.3.2.3 Use Satmaster
F.3.2.4 Use a Spectrum Analyzer
You may use a Spectrum Analyzer capable of integrating the signal power in a given bandwidth
to estimate PSD Ratio or CnC Ratio:
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 the same Symbol Rate / Bandwidth, then the CnC Ratio is same as the
PSD Ratio.