Comtech EF Data CDM-425, Installation And Operation Manual

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CDM-425 Advanced Satellite Modem
Revision 0
ODU (Transceiver, BUC, LNB) Operation 10–6 MN-CDM-425
10.3.3.1 (SELECT: CONFIGURATION) Menu Branches
CONFIG: All Mode Tx Rx Clocks D&I/ACM
CnC EDMAC Misc Mask Remote IP (

)
Use the
◄ ►
arrow keys to select Tx , Rx , or Mask , and then press ENTER .
10.3.3.1.1 CONFIG: Tx

Freq and CONFIG: Rx

Freq Submenus
Tx-IF Frequency: 1750.0000 MHz
(LO:12500 MHz Sat:14250.0000 MHz) (

)
Rx-IF Frequency: 1200.0000 MHz
(LO:12500 MHz Sat:13700.0000 MHz) (

)
When you use the ODU menus to configure a BUC or LNB LO-frequency, the CONFIG:
Tx→Freq
and
CONFIG: Rx→Freq
menu screens provide supplemental information on the
bottom line. As you edit the IF frequency, the Satellite frequency updates accordingly.
Satellite frequency = LO ± IF frequency
, where the ± sign is determined
by the LO mix setting:
•
High-sided mix [–] (includes a spectral inversion)
•
Low-sided mix [+]
To edit the Tx-IF or Rx Frequency :
Use the
◄ ►
arrow keys to select a digit to edit, and then 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.
10.3.3.1.2 (SELECT: CONFIGURATION) Mask Submenus
The Mask submenus allow you to selectively mask (ignore) or make active various alarms and
traffic conditions that are monitored by the modem.
Alarm Masks: AIS Buffer Ref RxIF TxClk
TxSat RxSat Terr ROp BUC LNB CEX (

)
Use the
◄ ►
arrow keys to select BUC or LNB , and then press ENTER .