Receive / Demodulator - Comtech EF Data CDM-740 Installation And Operation Manual

CDM-740 Advanced Satellite Modem
Introduction
1.5.2

Receive / Demodulator

L-Band Input
L-Band Input Power Range
Data Decapsulation
FEC
Operating Modes
LNB 10 MHz Reference
LNB Voltage
LNB Current Alarm
950 to 2150 MHz, Type F female
-25 to -55 dBm
MPE/IP (ETSI EN 301 192 Multi-Protocol Encapsulation)
LDPC+BCH: 5 bit soft decision, proprietary
DVB-S (ETSI EN 300 421):
•
Rate QPSK 1/2
•
Rate QPSK 2/3
•
Rate QPSK 3/4
•
Rate QPSK 5/6
•
Rate QPSK 7/8
DVB-S2 (ETSI EN 302 307):
•
Rate QPSK 1/4
•
Rate QPSK 1/3
•
Rate QPSK 1/2
•
Rate QPSK 3/5
•
Rate QPSK 2/3
•
Rate QPSK 3/4
•
Rate QPSK 5/6
•
Rate QPSK 8/9
•
Rate QPSK 9/10
•
Rate 8-PSK 3/5
•
Rate 8-PSK 2/3
•
Rate 8-PSK 3/4
•
Rate 8-PSK 5/6
•
Rate 8-PSK 8/9
Note: Refer to Table 5-2 through Table 5-4 for additional data rate/symbol rate
information.
On center conductor of L-Band input connector, selectable ON/OFF.
Level: -3dBm ± 3 dB.
Source: either Internal modem reference or External reference
Performance: For phase noise, refer to L-Band modulator 10 MHz Frequency
stability same as the modulator 10 MHz reference.
On center conductor of L-Band input connector, selectable ON/OFF, 13, 18 volts
per DiSEq 4.2 and 24VDC at 500 mA maximum.
Programmable MIN and MAX current alarms.
1–11
Revision 0
MN-CDM740
•
Rate 8-PSK 9/10
•
Rate 16-APSK 3/5
•
Rate 16-APSK 2/3
•
Rate 16-APSK 3/4
•
Rate 16-APSK 5/6
•
Rate 16-APSK 8/9
•
Rate 16-APSK 9/10
•
Rate 32-APSK 3/5
•
Rate 32-APSK 2/3
•
Rate 32-APSK 3/4
•
Rate 32-APSK 5/6
•
Rate 32-APSK 8/9
•
Rate 32-APSK 9/10