Config: Tx  Freq (Frequency) - Comtech EF Data CDM-625A Installation And Operation Manual

CDM-625A Advanced Satellite Modem
Front Panel Operation
make the modem compatible with certain other manufacturer modems.
• Txα (Tx Alpha Filter Rolloff Factor): Use the
or the default value of 0.35. Press ENTER when done.
The Rxα of the corresponding receiver must match the Txα – see Sect. 6.2.1.4.1
for details. To summarize:
6.2.1.3.2 CONFIG: Tx  Freq (Frequency)
Tx-IF Frequency:
To edit the Tx-IF Frequency, use the
arrow keys to change that digit. The available ranges are 50-180 MHz, and 950-2250 MHz
▲▼
(L-Band) (FAST option). The resolution is 100Hz. Press ENTER when done.
When you use the ODU menus to configure a BUC LO-frequency, this menu displays a second
line of information:
Tx-IF Frequency:
(LO:12500 MHz
As you edit the IF frequency, the Satellite frequency updates accordingly.
Satellite frequency = LO ± IF frequency
by the LO mix parameter:
•
•
6.2.1.3.3 CONFIG: Tx  Power
Output Power: Mode= Manual (Manual,AUPC)
Level= –20.0 dBm
Use the ◄ ► arrow keys to select the Output Power Mode (top line) or to edit the Output Power
Level (bottom line) and then press ENTER.
On the top line – Use the
AUPC (see next section for conditional selection).
• If Txα ≥ 0.25, then set Rxα = 0.35
• If Txα ≤ 0.20, then set Rxα = 0.12
◄ ►
Sat:14250.0000 MHz) ()
High-sided mix [–] (includes a spectral inversion);
Low-sided mix [+].
arrow keys to select the Output Power Mode as MANUAL or
▲▼
arrow keys to select 0.05, 0.10, 0.15, 0.25,
▲▼
0050.0000 MHz
arrow keys to select a digit to edit, and then use the
1750.0000 MHz
, where the sign ± is determined
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MN-CDM625A
()
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