Estimating Psd Ratio - Comtech EF Data SLM-5650A Installation And Operation Manual

SLM5650A_CDM625 Satellite Modem
DoubleTalk Carrier-in-Carrier Option
15.5.2

Estimating PSD Ratio

PSD can be estimated from a link budget using Downlink EIRP and Symbol Rate:
PSD Ratio Example:
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
15.5.2.1 Estimating PSD Ratio from LST
PSD = Downlink EIRP – 10 * Log (Symbol Rate)
Downlink EIRP
27 dBW
24 dBW
Symbol Rate
500 ksps
375 ksps
15–18
MN-SLM5650A
Power Spectral Density
-29.99 dBW/Hz
-31.74 dBW/Hz
Revision 8