Methods To Estimate Psd Ration; Use Downlink Eirp And Symbol Rate; Use Lst - Comtech EF Data CDM-425 Installation And Operation Manual

F.3.2

Methods to Estimate PSD Ration

F.3.2.1

Use Downlink EIRP and Symbol Rate

Use Downlink EIRP and Symbol Rate to estimate the PSD Ratio from a link budget:
Carrier
A to B
B to A
PSD Ratio (@ A) = -29.99 – (-31.74) = 1.75 dB
PSD Ratio (@ B) = -31.74 – (-29.99) = -1.75 dB
F.3.2.2

Use LST

Appendix F
PSD = Downlink EIRP – 10 * Log (Symbol Rate)
Table F-11. PSD Ratio Example
Downlink EIRP
27 dBW
24 dBW
CDM-425 Advanced Satellite Modem
Symbol Rate
500 ksps
375 ksps
F–20
Revision 0
Power Spectral Density
-29.99 dBW/Hz
-31.74 dBW/Hz
MN-CDM-425