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UT-4500-A Series Upconverters Revision 0
Appendix B MN-UT4500A
B–13
B.4.4 Offset Adjustment
The offset is used to compensate for cable and switch losses. When the system is initially set up
and tested, each upconverter needs to be forced to backup and the offset adjusted to minimize
gain mismatch between the normal and bypassed mode. This offset will be different for each
upconverter and is stored in a table in the backup unit. Follow these steps to set the offset:
Step Description
1 Connect a signal source to the input and a power meter or spectrum analyzer to the output of the first
online upconverter.
2 Record the output power.
3 Force a backup of the first online unit and adjust the offset until the output power matches what was
recorded in Step 2.
4 Restore the online unit and repeat for the other online units.
B.4.5 Redundancy Systems – Upconverter Removal and Replacement
In a redundancy system, to remove an “inline” upconverter for repair, the following procedure
must be used:
Step Description
1 Force backup of faulted unit.
2 Turn the power switch on the inline upconverter rear panel to OFF, and remove the power cord from the
upconverter. DO NOT disconnect the RF and IF cables from the TSM.
3 Unscrew the mounting screws on the TSM first, and then unscrew the rack mounting screws on the front
panel of the upconverter.
4 From the rear of the inline upconverter, hold the TSM and push the upconverter to the front of the rack until
TSM is free of the upconverter chassis.
5 Remove the inline upconverter from the front of the rack.
To install the replacement unit, the following procedure must be used.
Step Description
1 Power up the new unit on the bench.
2 Configure the new unit for the correct redundancy settings (Redundant = ON, Address = match old unit).
3 Power off the new unit.
4 Remove existing personality module from the new unit.
5 Carefully install the new unit into the rack. The existing module in the rack will be plugged into the new unit.
6 Power up the new unit and un-force the backup.