Config:) Tx Freq (Frequency); Config:) Tx Fec; Config:) Tx Mod (Modulation) - Comtech EF Data CDM-740 Installation And Operation Manual

CDM-740 Advanced Satellite Modem
Front Panel Operation
When the Tx Monitor Port is turned On, an L-Band copy of the Tx carrier is provided. Note the
following:
•
Monitor 70/140: Frequency = 900 MHz + programmed 70/140 MHz value;
•
Monitor L-Band: Frequency = the programmed L-Band value;
•
The monitor output mutes when Tx Carrier=Off.
5.4.1.2 (CONFIG:) Tx
Tx-IF Frequency:
To edit the Tx Frequency, select each digit of the frequency to be edited using the ◄ ► arrow keys,
then edit the value of that digit using the
The available frequency ranges are 0050.0000 to 0180.0000 (50-180) MHz, and 0950.0000 to
2150.0000 (950-2150) MHz (L-Band). The resolution is 100Hz.
5.4.1.3 (CONFIG:) Tx
Output Power Level: –10.0 dBm
To configure the Tx Output Power Level, select each digit to be edited using the ◄ ► arrow keys,
then edit the value of that digit using the
For Tx frequencies of 50-180 MHz, the permitted level range is –5 to –25 dBm.
For Tx frequencies of 950-2150 MHz (L-Band), the permitted level range is –5 to –40 dBm.
5.4.1.4 (CONFIG:) Tx
Tx FEC Type: TPC (FPC)
This is a 'status only' message. The CDM-740 features TPC (Turbo Product Codec) as its sole
available Tx FEC type.
5.4.1.5 (CONFIG:) Tx
Mod Type=16QAM
FEC Rate=7/8
On the top line, use the ◄ ► arrow keys to select (Tx) Mod(ulation) Type, then set the Mod Type
as QPSK, 8QAM, or 16QAM using the
navigate to (Tx) FEC Rate on the bottom line, then set the Tx FEC Rate to either 3/4 or 7/8 using
the arrow keys. Press ENTER when done.
▲ ▼
Freq (Frequency)
0050.0000 MHz
arrow keys. Press ENTER when done.
▲ ▼
Power
arrow keys. Press ENTER when done.
▲ ▼
FEC
Mod (Modulation)
(QPSK,8QAM,16QAM)
(3/4,7/8)
arrow keys. Next, using the ◄ ► arrow keys to
▲ ▼
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