Comtech EF Data DD240XR Rev Е - Manual (Page 107)

DD240XR High-Speed Digital Demodulator Technical Specifications
TM115 – Rev. 1.2 7-1
Technical Specifications
7
7.0 Introduction
This section defines the technical performance parameters and specifications for the
DD240XR Digital Demodulator.
7.1 L-Band IF Specification
Rx IF:
950 –2150 MHz
IF Step Size: 1 Hz
IF Tuner Accuracy: ±2 kHz
Input Level: C
0
+10 log (Symbol Rate),
C
0
: -130 dBm/Hz to 105 dBm Hz
-70 to -45 dBm @ 1 Msps
-60 to -35 dBm @ 10 Msps
-53 to -28 dBm @ 45 Msps
Composite Power: < -20 dBm total input power
LNB Power: 18 V ± 0.5 V, 350 mA maximum
Input Impedance: 75 Ohm
Return Loss: 7 dB
Input Connector: F Connector
7.2 Optional 70/140 MHz Specification (includes L-Band)
Rx IF:
50 - 180 MHz
IF Step Size: 1 Hz
IF Tuner Accuracy: ±2 kHz
Input Level: C
0
+10 log (Symbol Rate),
C
0
: -130 dBm/Hz to -105 dBm Hz
-70 to -45 dBm @ 1 Msps
-60 to -35 dBm @ 10 Msps
-53 to -28 dBm @ 45 Msps
Composite Power: < -20 dBm total input power
Input Impedance: 75 Ohm
Return Loss: 15 dB
Input Connector: BNC Female
7.3 Baseband Specification
Compliance:
EN 300-421 and EN 301-210
Modulation Types: QPSK, 8PSK, 16QAM
Data Rate: 2 – 78.75 Mbps, 1 bps steps (QPSK, 204 framing)
2 – 120 Mbps, 1 bps steps (8PSK, 204 framing)
3 – 157.5 Mbps, 1 bps steps (16QAM, 204 framing)
Variable Data Rate: 1 – 157.5 Mbps
Step Size: 1 bps
Symbol Rate: 1 – 45 Msps, 1 sps steps
Frame Size: 187 payload bytes, 1 sync byte, 16 parity bytes
Terrestrial Framing: 204, 188, 187 (unframed data)
Baseband Roll-Off: 0.35 Square Root Raised Cosine (QPSK, 8PSK,
16QAM)
0.25 Square Root Raised Cosine (8PSK, 16QAM)