Table of Contents
Advertisement
Operation
3.3.13.2
Utility Demodulator
Refer to Figure 3-18.
ASSIGN RECEIVER
FILTERS
DEMODULATOR TYPE
DECODER TYPE
3–54
RX code rate/type selection. Select one of the following as follows:
RX-x QPSK 1/2
Code Rate
Data Rate Range
BPSK 1/2
2.4 to 1250 kbit/s
QPSK 1/2
4.8 to 2500 kbit/s
QPSK 3/4
7.2 to 3750 kbit/s
QPSK 7/8
8.4 to 4375 kbit/s
8PSK 2/3
64 to 5000 kbit/s
OQPSK 1/2
4.8 to 2500 kbit/s
OQPSK 3/4
7.2 to 3750 kbit/s
OQPSK 7/8
8.4 to 4375 kbit/s
BPSK 1/1
4.8 to 2500 kbit/s
QPSK 1/1
9.6 to 5000 kbit/s
Notes:
1. Max Symbol Rate: 2500 kbit/s
2. Max Data Rate for Low Var Rate: 512.0 kbit/s.
Upon entry, the current RX rate is displayed with the flashing cursor on
the first character of the code rate on line 1. The data rate is displayed on
line 2. Press [↑] or [↓] to select one of the predefined rates. To select the
currently defined variable data rate, select RX-V and press [ENTER]
twice. To change the rate using the variable rate selection, press
[ENTER] when the RX-V is displayed. A flashing cursor is displayed
on the first character of the coding type on line 1.
Press [←] or [→] to move the flashing cursor, and [↑] or [↓] to
increment or decrement the digit at the flashing cursor. Press [ENTER]
to execute the change.
RX filter type select. Select on the following for RX network filtering:
•
INTELSAT OPEN
•
EFD CLOSED
•
CSC CLOSED
•
FDC CLOSED
.
Note: RX FILTER TYPE is selectable only when Custom is selected
for modem type in the Utility Modem Type menu.
Decoder type selection. Select Viterbi or Sequential decoder type. The
modem must have the proper hardware enabled.
Note: This window is only available when Custom or ASYNC mode is
selected for modem type in the Utility Modem Type menu.
SDM-300A Satellite Modem
Rev. 4
Advertisement
Table of Contents
