Preselector; Duplexer; Table 7: Preselector Filter Bandwidth; Table 8: Duplexer Filter Bandwidth - Motorola MTS LiTE Installation, Configuration And Basic Service Manual

6802800U74-AN
Chapter 1: MTS Overview
• Hybrid Combiner (HC) (MTS 2 and MTS 4 Prime Cabinet only)
• Rx Splitter (Expansion Cabinet Only)
NOTICE: The Preselector types and Duplexer types used in MTS LiTE and MTS 2 are different
from the types used in MTS 4.
1.7.1.1

Preselector

The Preselector is a bandpass filter, which allows only the receiver signals to pass. The Preselector
incorporates a Receiver Multicoupler (RMC).
For 400 MHz, the filters bandwidth is 5 MHz, and it is designed to block transmitter frequencies as
close as 5 MHz from its band edges.

Table 7: Preselector Filter Bandwidth

MTS Frequency
260 MHz
400 MHz
800 MHz
900 MHz
1.7.1.2

Duplexer

The Duplexer consists of two bandpass filters. One filter allows the transmitter signal to pass, while the
other filter allows the receiver signal to pass.
The Duplexer incorporates both a Receiver Multicoupler (RMC) and a Digital Power Meter (DPM).
The following table describes filter bandwidth depending on the MTS frequency.

Table 8: Duplexer Filter Bandwidth

MTS Frequency
260 MHz
400 MHz
8
Bandwidth
6 MHz
5 MHz
19 MHz
5 MHz
Bandwidth
6 MHz
5 MHz
Description
Designed to block transmitter
frequencies as close as 6 MHz
from its band edges.
Designed to block transmitter
frequencies as close as 5 MHz
from its band edges.
Designed to block transmitter
frequencies as close as 19
MHz from its band edges.
Designed to block transmitter
frequencies as close as 5 MHz
from its band edges.
Duplex Spacing
Duplex spacing between a
transmitter frequency and the
corresponding receive fre-
quency is 9 MHz.
Duplex spacing between a
transmitter frequency and the
corresponding receive fre-
quency is 10 MHz, with the