Comtech EF Data CDM-625 - Manual (Page 349)

CDM-625 Advanced Satellite Modem Revision 15
DoubleTalk Carrier-in-Carrier Option MN-CDM625
10–19
10.5.2.3 Use SatMaster
10.5.2.4 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 same Symbol Rate / Bandwidth, then the CnC Ratio is same as the PSD
Ratio.