Specifications - Comtech EF Data SDM-650B Installation And Operation Manual

SDM-650B Satellite Modem

5.1.1 Specifications

Modulation Type
Frequency Range
Frequency Select Method
Frequency Step Size
Frequency Stability
Channel Spacing
Phase Error
Filtering Type
Spectral Occupancy
Spurious and Harmonics
Output Power Level Range
Output Power Adjustment
Output Stability
Output Impedance
Output Return Loss
Scrambling
Differential Encoding
FEC Encoding
I/O Connector
Rev. 6
QPSK (BPSK optional)
50 to 90 MHz, or 100 to 180 MHz
Synthesized
2.5 kHz
10 PPM
0.7 times the data rate divided by the encoding rate
2.5° max
Nyquist, re-equalized
See Figure 5-2
dB at ± 0.75 symbol rate
-50 dBc minimum in-band, 40 dBc minimum out-of-band
-5 to -30 dBm
0.5 dB step size
± 0.5 dB over -5 to -25 dBm
± 1 dB over -25 to -30 dBm
75 Ω (50 Ω optional)
20 dB minimum
V.35 or none
2 Phase or none
Convolutional, Rate 7/8, 3/4, or 1/2
DIN, 96-pin.
Theory of Operation
5–3