Comtech EF Data SDM-309B - Manual (Page 21)

Introduction SDM-309B Satellite Modem
1-1–8 MN/U-SDM309B Rev. #
Forward Error Correction Convolutional Encoding with Soft Decision
K7 Viterbi Decoding
Data Scrambling Selectable, Synchronous (Per IESS-309
Rev 3 Section 4.4.5) or None
Diagnostic Features RF Loopback
Digital Data Loopback
Fault Monitoring
Bit Error Rate Monitoring
Remote Control via Serial Port
Prime Power 90-132 VAC or 180 to 264 VAC, 47-63 Hz
75 W Max. Fused at 2 A
Size 5.25" H by 19.0" W by 18.0" D (3RU)
Weight 30 pounds Maximum
Additional Modulator Specifications
Output Power
Optional
-5 to -25 dBm, Adjustable
in 0.5 dB Steps
+5 to -20 dBm
Output Spurious and Harmonics -50 dBc in Band (50 to 90 Mhz
or 100 to 180 Mhz)
-40 dBc out of band
(spurious measured in 4 KHz BW)
Output Impedance 75
!
Output Return Loss 20 dB
Output Frequency Stability ± 10 ppm
Data Clock Source Internal or External
Internal Data Clock Stability ± 50 ppm
Additional Demodulator Specifications
Input Power (Desired Carrier)
(Maximum Total)
-30 to -55 dBm
+30 dB power within 20 Mhz
from desired carrier
+40 dB power outside of 20 Mhz
from desired carrier
0 dBm
Input Impedance 75
!
Input Return Loss 20 dB
Carrier Acquisition Range ± 25 KHz minimum
Clock Acquisition Range ± 100 ppm
Remote Control Specifications
Serial Interface RS-232 or RS-485/449
Baud Rate 300 to 9600 BPS
Signals Controlled/Monitored Transmit Frequency
Receive Frequency
Transmit Power
Transmitter On/Off
Data Rate Select
RF Loopback
Data Loopback
Scrambler On/Off
Descrambler On/Off
Raw Error Rate
Corrected Bit Error Rate
Receive Eb/N0
TX Clock Internal/External
RX Clock Normal/Invert
Receive Signal Level
Receive Carrier Detect
Power Supply Voltages
Fault Status
Stored Fault Status