Comtech EF Data DMD-2050E - Manual (Page 89)

DMD2050E Universal Satellite Modem Theory of Operation
MN-DMD2050E Revision 2 3–47
3.11.12.4 Estimating PSD Ratio from Satmaster
3.11.12.5 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.