Table of Contents
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SLM-3650 Satellite Modem
Theory of Operation
Parameter
Phase Error
Filtering Type
Spectral Occupancy
Spurious and Harmonics
Output Power Level Range
Output Stability
Output Power Adjustment
Output Impedance
Output Return Loss
Scrambler Type
Differential Encoding
FEC Convolution Encoding/
Viterbi or Sequential Encoding
Filter Masks
I/O Connector
Reported Faults
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Table 4-2. Modulator Specifications (Continued)
2.5° maximum
Nyquist, pre-equalized
Spectral density is -30 dB at ± 0.75 symbol rate
-55 dBc, 0 to 500 MHz
-5 to -30 dBm, ± 0.5 dB (+5 to -20 dBm high-power option)
± 0.5 dB
0.1 dB step size
50Ω (75Ω optional)
20 dB minimum
V.35
2-phase or none
Rate 1/2, 3/4, 7/8, 2/3 (Viterbi/TCM)
Rate 1/2, 3/4, 7/8 (Sequential)
Reed-Solomon: Rate 225/205, 126/112, 219/201
IBS: 219/204
FEC 'OFF' Uncoded
Open Net (Intelsat or Eutelsat), EFD Closed, Comstream Closed, FDC
Closed, and SDM-51 Compatible
TNC 50Ω (TX IF)
AGC Level
IF Synthesizer
I Channel Filter Activity
Q Channel Filter Activity
Modem Reference Activity
Data Clock Syn
Module
Modem Reference PLL
4–10
Specification
Revision 3
MN/SLM3650.IOM
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