Gain Offset For Redundant Operations - Comtech EF Data LBC-4000 Installation And Operation Manual

Note that, if you attempt to access this menu and the Redundancy State is Disabled, you will
see this message:
B.2.2 Gain Offset for Redundant Operations
Once you enable redundancy operation, you must use the Ofst (Gain Offset) command to define
the gain offset compensation in order to match gain between the two converters.
Gain Offset is configured at installation and initial setup only. You should use
the normal attenuation functions during normal operations.
To set the Gain Offset parameters for redundant operation, do these steps:
1. Monitor the output signal level on power meter / spectrum analyzer.
2. Enable Redundancy on the converter (SELECT:CONFIG  REDUND 
STATE=Enable).
3. Put the converter into "Manual" Redundancy Mode (SELECT:CONFIG  REDUND 
MODE=Manual).
4. Force Converter B online (SELECT:CONFIGREDUNDFrcBkup=YES). Then,
measure the output.
5. Force Converter A online (SELECT: CONFIGREDUNDFrcBkup=YES). Then, adjust
the Gain Offset. Using the SELECT: CONFIG  Conv-A  ATTEN/SLOPE submenu:
a. Use the [][] arrow keys to select the Gain Offset (Ofst=) digit to edit, and
b. Once the Gain Offset output value matches Converter B, press [ENT].
6. Repeat Steps 4 and 5 until the output levels track.
7. Return unit to the desired redundancy state.
Appendix B
Not Available in
Current Mode
CONFIG CnvA Ofst=+0.0dB
Atten=20.00dB Slope=0.0
then use the [][] arrow keys to change that value.
LBC-4000 L-Band Up/Down Converter System
B–4
Revision 6
MN-LBC-4000