Westell AWC?TMAV?850?FB Installation Manual

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Westell
1.

GENERAL

1.1

Document Purpose

This document provides installation and specification information
on Westell's AWC‐TMAV‐850‐FB 850 MHz Full Band Tower
Mounted Amplifier (TMA). A Westell AWC‐TMAV‐850‐FB
TMA is shown in Figure 1. See Table 1 for ordering information.
1.2 Document Status
Whenever this document is updated, the reason will be stated in
this paragraph.
‐ NOTE ‐
Hereafter, the AWC‐TMAV‐850‐FB Tower Mounted Amplifier may
be referred to as the "TMA."
1.3 Product Purpose & Description
Westell's TMA's are cost­effective tools to extend cell site cover­
age and improve cell site capacity by conditioning and
amplifying the user‐endpoint uplink signal in an LTE radio ac­
cess network. Westell's TMAs can be used in any application
which requires improved receiver sensitivity of the BTS/eN­
odeB.
1.4

Product Mounting Location

The TMA is typically installed on a cell tower, close to the an­
tenna. See Paragraph 3.4 for mounting steps and Figure 6 for
dimensions.
1.5

Product Features

Features of the TMA are shown in the following list.
S
Advanced, balanced LNA design with variable gain capability
S
Low noise figure, return loss, and bypass insertion loss
S
Compact size
S
Heavy‐duty top and bottom mounting brackets with various
mounting holes to accept mounting bolts/screws and
mounting straps or bands
S
Two, female, 7/16 DIN connectors at the bottom of the unit;
one for antenna connection and one for BTS
S
Weather rating of IP67 (temperature range of ‐40_ to +65_C)
2

FUNCTIONAL DESCRIPTION

The TMA includes the following functional blocks, as shown in
Figure 2.
2.1 Control, Bias & Alarm Electronics
This block includes the control processor, AISG modem, and
lightning protection.
1312I1RA
‐ Installation Guide ‐
AWC‐TMAV‐850‐FB Tower Mounted Amplifier
E
Copyright 2013 Westell, Inc. All rights reserved.
030‐300302 Rev A, December 2013
Front View
Figure 1. Tower Mounted Amplifier (TMA) Unit
2.2 Pre­LNA Rx BPF
This is the pre­LNA (Low Noise Amplifier) band pass filter.
This filter conditions the uplink signal from the antenna before
the LNA.
2.3

Balanced Low Noise Amplifier

This is the amplifier of the TMA and includes the bypass cir­
cuitry.
2.4 Post­LNA Rx BPF
This is the post­LNA band pass filter. This filter conditions the
uplink signal to the eNodeB.
2.5

Tx BPF

This is the transmit band pass filter. This filter conditions the du­
plexed downlink signal from the eNodeB to the antenna.
Control, Bias &
Alarm Electronics
Balanced Low
Noise Amplifier

Pre-LNA Rx BPF

−
RF Bypass
& Switches
ANTENNA
Figure 2.
Section AWC‐TMV‐850‐301
Equipment Issue 1
Rear View
Lightning
Protection
Post-LNA
Rx BPF
Bias-T
Tx BPF
BTS
Block Diagram
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