Mts 4 Rfds; Mts 4 Filter Tray - Motorola MTS LiTE Installation, Configuration And Basic Service Manual

6802800U74-AN
Chapter 7: Radio Frequency Distribution System
To avoid injury, allow the Hybrid Combiner to cool down before servicing.
3 Remove the TX and antenna cables.
4 Loosen the two screws that secure the Hybrid Combiner onto the bracket.
5 Slide the Hybrid Combiner forward and pull free from the screws. Slide it out from the bracket.
7.2.4.1.2
Reinstalling the Hybrid Combiner
Procedure:
1 Place the Hybrid Combiner on the bracket of the cabinet with the heat sink facing the side of the
cabinet.
NOTICE: In the MTS 2, the heat sink should face inwards towards the center of the
cabinet.
2 Slide in the Hybrid Combiner at an angle.
3 Secure the lip at the back of the Hybrid Combiner behind the bracket.
4 Fasten the screws to the bracket.
5 Attach the TX and antenna cables.
6 Switch ON the Power Supply Unit.
7.3

MTS 4 RFDS

The MTS 4 uses a high-power RFDS intended for up to 4 high power Base Radios. The RFDS in MTS
4 is made up of the following:
• Up to three Preselectors low-loss Preselectors with integrated high performance LNA and RMC.
The supply voltage for the LNA is supplied through the RX out connected to the Base Radios. The
Preselectors have outputs for four Base Radios. Dimensions of the filter are 90 x 180 x 200 mm
excluding connectors. The antenna connectors are DIN 7–16. The RX signals from Base Radios
are connected with QMA connectors.
• Up to two Post Filters low-loss Post Filters rated for up to 8 TETRA modulated carriers. The
antenna connectors are DIN 7–16, the TX signals to Cavity Combiners are connected with QN
connectors.
• Up to two Duplexers Preselectors with an integrated receiver multicoupler (RMC) and a Post Filter
with a digital power monitor (DPM) combined into one unit. Duplexer is rated for up to four TETRA
modulated carriers. The antenna connectors are DIN 7–16, the transmit site is connected with QN
connectors. The receive side has integrated LNA as for the Preselector and four RX outputs (QMA).
The supply voltage for the LNA is supplied through the RX ports.
• Hybrid Combiner – combining of four carriers on 2 TX antennas. Cavity Combiners - combining of
four carriers on 1 TX antenna.
MTS 4 is equipped with a digital power monitor to ensure diagnostic availability. The digital interface
has the same benefits as described for the MTS 2 digital VSWR monitor.
7.3.1

MTS 4 Filter Tray

The MTS 4 filter tray can carry different filter configurations. The antenna connectors extend from the
cabinet top cover and antenna cables connect directly onto the filters.
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