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

Theory of Operation

5.2.1 Specification

Operating Symbol Rate Range
Operating Code Rate Range
Input Signal
Output Signals
Carrier Phase Error
Carrier Loop Bandwidth
Clock Phase Error
Clock Loop Bandwidth
Clock Jitter
Bit Error Rate
Maximum Data Rate
Synchronization Time
Output Fault Indicators
Raw BER Detection
Descrambling
Differential Decoding
I/O Connector
5–8
Demodulator Processor
32 Ks/s to 2048 Ks/s
7/8, 3/4, 1/2
11 Level Quantized I and Q
VCXO Drive, AGC Drive, I sign, I mag,
Q sign, Q mag, Symbol, Clock, Data Clock
± 3° max.
Software controlled
± 5%
Software controlled
5% P-P max.
Sequential Decoder
See Chapter 1
2.1 Mbit/s (Rate 1/2)
3.2 Mbit/s (Rate 3/4 and 7/8)
19000 bits, max.
Activity detection of I and Q data
Sign bits and descrambler data
From 0 to 255 bits out of 1024 samples
V.35 or none
2 phase
DIN, -96-pin
SDM-650B Satellite Modem
Rev. 6