System Specification; Table 1-1. Operating Specifications - Comtech EF Data SDM-650B Installation And Operation Manual

SDM-650B Satellite Modem

1.3 System Specification

Table 1-1 lists the operating specifications of the modem.
Operating Frequency Range
Type of Modulation
Operating Channel Spacing
BER
Digital Interface
Digital Data Rate:
Forward Error Correction
Data Scrambling
Diagnostic Features
Prime Power
Size
Output Power
Output Spurious and Harmonics
Output Impedance
Output Return Loss
Output Frequency Stability
Data Clock Source
Internal Data Clock Stability
Rev. 5

Table 1-1. Operating Specifications

Variable Rate
Single Rate
Additional Modulator Specifications
System Specifications
50 to 90 MHz, or 100 to 180 MHz. Synthesized in
2.5 kHz steps.
QPSK.
BPSK.
Less than 0.5 dB degradation operating with 2 adjacent
like channels each 10 dB higher at 1.3 times the
symbol rate or 75 kHz minimum.
See Table 1-2.
RS-422/-449.
V.35.
DS-1 STD.
G.703.
Others optional.
19.2 to 3584 kbit/s configurable. Choice of up to four
pre-defined rates, or variable rate option.
19.2 to 48 kbit/s, 1/2 rate BPSK only.
19.2 to 2048 kbit/s.
19.2 to 3584 kbit/s.
2048 kbit/s maximum for 1/2 rate.
3072 kbit/s maximum for 3/4 rate.
3584 kbit/s maximum for 7/8 rate.
Convolutional encoding with soft decision, sequential,
or K=7 Viterbi decoding.
Selectable.
CCITT V.35.
None.
RF Loopback.
IF Loopback.
Digital Data Loopback.
Fault Monitoring.
BER Monitoring.
Remote Control via Serial Port.
90 to 132 VAC, or 180 to 264 VAC, 47 to 63 Hz.
75W maximum, fused at 2A.
-48 VDC optional.
5.25" x 19.0" x 18.0" (3RU).
-5 to -30 dBm, adjustable in 0.5 dB steps.
+5 to -15 dBm with high power option.
-50 dBc in-band (50 to 90 MHz, or 100 to 180 MHz).
-40 dBc out-of-band.
75 .
Ω
20 dB.
± 10 PPM.
Internal or External.
± 50 PPM.
Introduction
1–5