6802800U74-AN
Chapter 7: Radio Frequency Distribution System
Figure 142: Schematic Diagram of MTS LiTE / MTS 2 Preselector
Preselector
DC RX
BR1
Antenna LNA
DC
RX BR2
7v DC supply
NOTICE: Unused RX outputs should be terminated.
7.2.2.1
Replacing the MTS LiTE / MTS 2 Preselector
For a list of available FRUs, see Field Replaceable Units (FRUs) on page 446.
Prerequisites:
WARNING: RF energy burn hazard. Disconnect power in the cabinet to prevent injury and
equipment damage while disconnecting and connecting antennas.
Process:
1 Remove the Preselector, see Removing the Preselector – MTS LiTE on page 265 or Removing
the Preselector – MTS 2 on page 266.
2 Reinstall the Preselector, see Reinstalling the Preselector – MTS LiTE on page 266 or
Reinstalling the Preselector – MTS 2 on page 266.
7.2.2.1.1
Removing the Preselector – MTS LiTE
Procedure:
1 Remove the door of the cabinet completely.
2 Unscrew the antenna cable on the Preselector.
3 Remove the two fastening screws behind the antenna.
4 Loosen the two fastening screws at the front enough to free the center tab.
CAUTION: Do not remove the screws entirely because the filter will drop.
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