Comtech EF Data SLM-5650A Installation And Operation Manual page 484

G.3.6 Validating Carrier-in-Carrier Performance
Carrier-in-Carrier performance can be easily validated by verifying that Eb/No degradation due to
Carrier-in-Carrier is within published specification for the observed Power Spectral Density Ratio.
The following procedure is recommended for validating Carrier-in-Carrier performance.
Step
1 Setup a conventional side-by-side link of the desired Eb/No.
Example Link:
2 Relocate one of the carriers on top of the other carrier:
Appendix H
a. Carrier-in-Carrier should be OFF.
b. Record the Eb/No as displayed by the Modems.
c. Observe the two carriers on a spectrum analyzer and record the PSD ratio.
Full duplex 512 kbps, QPSK, LDPC 2/3 circuit between 4.6 m and 2.4 m antennas
•
Recorded Eb/No = 2.6 dB (at both modems)
•
PSD Ratio = 1.2 dB (measured at larger Antenna)
•
a. Enable Carrier-in-Carrier.
b. Record the Eb/No as displayed by the Modems.
Task
G–18
SLM-5650A Satellite Modem
Revision 10
MN-SLM-5650A