Comtech EF Data SLM-5650A - Manual (Page 316)

SLM5650A_CDM625 Satellite Modem Revision 8
DoubleTalk Carrier-in-Carrier Option MN-SLM5650A
15–18
15.5.2 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) = -31.74 – (-29.99) = -1.75 dB
15.5.2.1 Estimating PSD Ratio from LST