Estimating Psd Ratio; Estimating Psd Ratio From Lst - Radyne DMD20 Installation And Operation Manual

DMD20/20LBST Universal Satellite Modem

3.15.13 Estimating PSD Ratio

PSD can be estimated from a link budget using Downlink EIRP and Symbol Rate:
PSD Ratio Example:
Carrier Downlink EIRP
A to B 27 dBW
B to A 24 dBW
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

MN-DMD20-20LBST Revision 14
PSD = Downlink EIRP – 10 * Log (Symbol Rate)
Symbol Rate
500 ksps
375 ksps
Power Spectral Density
-29.99 dBW/Hz
-31.74 dBW/Hz
Theory of Operation
3–42