Specifications

DMD20/20LBST Universal Satellite Modem Theory of Operation
MN-DMD20-20LBST Revision 14 3–42
3.15.13 Estimating PSD Ratio
PSD can be estimated from a link budget using Downlink EIRP and Symbol Rate:
PSD = Downlink EIRP – 10 * Log (Symbol Rate)
PSD Ratio Example:
Carrier
Downlink EIRP
Symbol Rate
Power Spectral Density
A to B
27 dBW
500 ksps
-29.99 dBW/Hz
B to A
24 dBW
375 ksps
-31.74 dBW/Hz
PSD Ratio (@ A) = -29.99 – (-31.74) = 1.75 dB
PSD Ratio (@ B) = 01.74 – (-29.99) = -1.75 dB
3.15.13.1 Estimating PSD Ratio from LST