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

LBC-4000 L-Band Up/Down Converter System
Appendix B
B.3.4

Gain Offset for Redundant Operations

Once redundancy has been enabled, the Ofst (Gain Offset) command, available from the
Configure: Conv‐A
to match gain between the two converters.
Gain Offset is set at installation only. In operation, the normal attenuation setting
should be used.
The procedure to set the Gain Offset parameters for redundant operation is as follows:
Step Task
1 Monitor output signal level on power meter / spectrum analyzer.
2 Enable Redundancy on converter (CONFIG: REDUND
3 Put converter into "Manual" Redundancy Mode (CONFIG: REDUND
4 Force Converter B online (CONFIG: REDUND FrcBkup=YES) and measure output .
Force Converter A online (CONFIG: REDUND FrcBkup=YES) and then, using the
CONFIG: Conv-A menu:
5
Adjust Ofst (Gain Offset) by first using the [←][→] arrow keys to select the Gain Offset digit
to edit, and then the [↑][↓] arrow keys to change that value.
Once the Gain Offset output value matches Converter B, press [ENT].
6 Repeat Steps 4 and 5 until output levels track.
7 Return unit to desired redundancy state.
Atten/Slope submenu, allows gain offset compensation in order for you
CONFIG CnvA: Ofst=+0.0dB
Atten=00.00dB Slope=0.0
B–7
MN/LBC4000.IOM
STATE=Enable).
MODE=Manual).
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