Comtech EF Data LBC-4000 - Manual (Page 137)

LBC-4000 L-Band Up/Down Converter System with Ethernet Revision 2
Appendix B MN-LBC4000A
B–7
B.3.4 Gain Offset for Redundant Operations
Once redundancy has been enabled, the Ofst (Gain Offset) command, available from the
Configure: Conv‐A Æ Atten/Slope submenu, allows gain offset compensation in order for you
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 Æ REDUND Æ STATE=Enable).
3 Put converter into “Manual” Redundancy Mode (CONFIG Æ REDUND Æ MODE=Manual).
4 Force Converter B online (CONFIGÆREDUNDÆFrcBkup=YES) and measure output .
5
Force Converter A online (SELECT: CONFIGÆREDUNDÆFrcBkup=YES) and then, using the SELECT:
CONFIG Æ Conv-A menu:
CONFIG CnvA: Ofst=+0.0dB
Atten=00.00dB Slope=0.0
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.