Estimate Psd Ratio From Satmaster - Comtech EF Data CDM-570A Installation And Operation Manual

G.5.2.2 Estimate PSD Ratio from Satmaster
Carrier A to B
Carrier B to A
G.5.2.3 Use a Spectrum Analyzer to Estimate PSD Ratio
You can also estimate PSD Ratio or CnC Ratio by 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.
DoubleTalk Carrier-in-Carrier Option
CDM-570A/570AL Satellite Modem with Optional Packet Processor
(in dBm) – Power (in dBm)
C1 C2
– 10 log BW (in Hz)) – (Power
C1 C1
/ BW )
C1 C2
G–22
PSD (Carrier A->B)
= 24.34 – 10 * log(2.3441 x 10
= – 39.36 dBW/Hz
PSD (Carrier B->A)
= 21.88 – 10 * log(2.3441 x 10
= – 41.82 dBW/Hz
PSD Ratio
± 2.46 dB
CnC Ratio
± 2.46 dB
– 10 log BW
C2 C2
MN-CDM570A
Revision 5
-6 )
-6 )
(in Hz))