
DMDVB20 LBST Satellite Modem Appendix D
TM138 – Rev. 1.0 D-5
Any Rate 2.048 & lower: 1/15 Framing or No Framing, 1/2, 3/4, 7/8 Rate FEC
D.1.1 Operational Case Examples
For best results always begin setup by setting the data rate to 512 Kbps.
This data rate is applicable for all modes and as such provides a
convenient launch point for setting up the modulator parameters. Any
mode of operation can be entered from this starting point.
Case 1: IBS 1.544 Mbps, 3/4 Rate Viterbi
Starting with the Data Rate – 512 Kbps
Modulator:
Method 1 -
Under Interface Menu:
Set Interface type
Set Tx clock selection
Set Framing to 1/15
Set mode to IBS
Under Mod Data Menu:
Set code rate to 3/4 VIT
Set data rate for 1544000
Under Mod IF Menu: Set desired Tx frequency and power level
Turn IF ON
Method 2 -
Under Interface Menu:
Set Interface type
Set Tx clock selection
Set Mod strap code to: 120
Under Mod IF Menu: Set desired Tx frequency and power level
Turn IF on
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