Comtech EF Data CDM-625A - Manual (Page 480)

CDM-625A Advanced Satellite Modem MN-CDM625A
CDM-625A ODU (Transceiver, BUC, LNB) Operation Revision 3
10–12
10.3.3.3.2 ODU: LNB:PwrSupply+Ref (Power Supply and Reference)
LNB control/monitor:
PSU-and-10MHz LO-freq PSUmonitor ()
The modem can supply DC power to an LNB connected to the Type ‘N’ rear panel Rx connector.
It can also supply a 10 MHz reference for a phase-locked LNB. Use the ◄ ► arrow keys to select
PSU-and-10MHz, LO-freq, or PSUmonitor, and then press ENTER.
10.3.3.3.2.1 ODU: LNB:PwrSupply+Ref  PSU-and-10MHz
LNB: Voltage=Off 10MHz:Off (Off,On)
Alarm limits, from 000 to 500 mA ()
Use the ◄ ► arrow keys to select Voltage, 10MHz, or Alarm Limits. Then, use the ▲▼ arrow
keys to change that setting:
Selection Setting
Voltage Select Off, 13V, 18V, or 24V
10MHz Set the 10MHz Reference as Off or On.
Alarm Limits
Use the◄ ►arrow keys to select a digit to edit, and then use the ▲▼ arrow keys to
change that digit. Valid range, in mA, is 000 to 500.
Press ENTER when done.
10.3.3.3.2.2 ODU: LNB:PwrSupply+Ref  LO-Freq (Local Oscillator
Frequency)
LNB-LO: Frequency= 00000 MHz
Mix= High [-] (Hi,Lo) ()
Use the ◄ ► arrow keys to select the LNB-LO (Local Oscillator) Frequency for the
downconversion, or Mix to set the polarity for the downconversion mix in the LNB.
On the top line – To set the LNB-LO Frequency, use the ◄ ► arrow keys to select a digit to edit,
and then use the ▲▼ arrow keys to change that digit. The valid LO range is 3000 to 65000 MHz.
Entering a non-zero value for LNB LO causes the Rx-IF frequency menu to show LO and Satellite
frequencies ( satellite frequency = LO frequency ± modem frequency ).
Press ENTER when done.
On the bottom line – To set the Mix polarity, use the ▲▼ arrow keys to set polarity as Hi (to
indicate a high side, inverting mix) or Lo (to indicate a low side, non-inverting mix).
Press ENTER when done.