Comtech EF Data SDM-300L3 - Manual (Page 405)

SDM-300Ls Satellite Modem Revision 1
Burst Mode Modulator Operation MN/SDM300L3.IOM
B–7
B.3 Burst Mode Specifications
General Specifications
Operating Frequency Range 950 to 1750 MHz, synthesized in 100 Hz steps
Type of Modulation QPSK
Operating Channel Spacing Less than 0.5 dB degradation operating with 2 adjacent-
like channels, each 10 dB higher at 1.3 times the symbol
rate, or a minimum of 1.2 times the specified acquisition
range
Bit Error Rate See Table 1-3
Phase Noise In accordance with IESS-308
Digital Interface
(Field Changeable Plug-in Modules)
One Interface per Module)
RS-422/449 on 37-pin D
MIL-STD-188 on 37-pin D
V.35 on 25-pin D or 34-pin block
RS-232 on 25 pin-D
Digital Data Rate:
QPSK, 1/2 Rate
QPSK, 1/2 Rate
19.2 kbps
57.6 kbps
Doppler Buffer N/A
Forward Error Correction Convolutional encoding with soft decision, K=7 Viterbi
decoding or Sequential
Data Scrambling Selectable or none, 215-1, synchronous
Prime Power 90 to 264 VAC auto select, 47 to 63 Hz, 50W maximum,
fused at 2A, 38 to 64 VDC
Operating Temperature 0 ° to 50 ° C (32 to 122 ° F)
Humidity 0 to 95% noncondensing
Diagnostic Features IF Loopback
RF Loopback
Baseband Loopback (bi-directional, electrical)
Fault Monitoring
Bit Error Rate Monitoring
Remote Control via Serial Port