Service Manual

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6802800U74-AN
Chapter 7: Radio Frequency Distribution System
Figure 139: MTS 2 TX/RX on 1 ant., RX on 1 ant - Filter Configuration
Figure 140: MTS 2 TX/RX on 1 ant., RX on 2 ant - Filter Configuration
7.2.2
MTS LiTE / MTS 2 Preselector
The MTS LiTE/MTS 2 Preselector is a bandpass filter, which only allows the receiver signals to pass.
With a bandwidth of:
• 5 MHz for 400 MHz version
• 6 MHz for 260 MHz version (MTS 2 only)
• 19 MHz for 800 MHz version
• 5 MHz for 900 MHz version
The filters bandwidth is designed to block transmitter frequencies. The receive and transmit bandpass
are 10 MHz apart for 400 MHz, 45 MHz apart for 800 MHz and 15 MHz apart for 900 MHz. The
Preselector incorporates an LNA followed by an RMC.
NOTICE: The MTS LiTE Preselector FRU is common with the MTS 2 Preselector.
PRESELECTOR
DUPLEXER
HYBRID
COMBINER
TX A
BR 1 BR 2
BR 1 BR 2
TX Out
TX
CAN 1 CAN2
TX B
PRESELECTOR
PRESELECTOR
DUPLEXER
HYBRID
COMBINER
TX A
BR 1 BR 2
BR 1 BR 2
BR 1 BR 2
TX Out
TX
CAN 1 CAN2
TX B