Motorola DIMETRA MTS 2, Installation, Configuration And Basic Service Manual

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MTS 4 Duplexer Chapter 7: Radio Frequency Distribution System
MTS 4 Duplexer
The Duplexer is a Preselector with an integrated receiver multicoupler (RMC) and a Post Filter
with a digital power monitor (DPM) combined into one unit. These form the two bandpass
fi
lters that make up the Duplexer; one is a receive
fi
lter and the other a transmit
fi
lter. See
the block schematic of the MTS 4 Duplexer in Figure 7-21
For 400 MHz, the duplex spacing between a transmitter frequency and the corresponding receive
frequency is 10 MHz, with the transmitter frequency highest. This leaves a 5 MHz spacing between
the lowest possible transmit frequency and the highest possible receive frequency.
For 800 MHz, the duplex spacing between a transmit frequency and the corresponding receive
frequency is 45 MHz, and leaves a 19 MHz spacing between the lowest possible transmit
frequency and the highest possible receive frequency.
The MTS 4 Duplexer has 4 RX outputs and one expansion output. It can handle a maximum power 180 Watts.
Figure 7-20 MTS 4 Duplexer
7-22
6802800U74-N September 2009