Gain Offset For Redundant Operations - Comtech EF Data MN/LBC4000.IOM Installation And Operation Manual

LBC-4000 L-Band Up/Down Converter System
Appendix B
To force the redundant unit into standby mode, use the [][] arrow keys to
select YES or NO. Press [ENT].
Note that, if you attempt to access this menu and the Redundancy State is
Disabled, you will see this message:
B.2.1.4 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 then use the [][] arrow keys to change that value.
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.
Not Available in
Current Mode
CONFIG CnvA Ofst=+0.0dB
Atten=20.00dB Slope=0.0
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MN/LBC4000.IOM
Revision 5