Section AWC‐TMV‐850‐301
R
Equipment Issue 1
030‐300302 Rev A, December 2013
Copyright 2013 Westell, Inc. All rights reserved.
1312I1RA
Page 1 of
6
‐ Installation Guide
‐
Westell
AWC‐TMAV‐850‐FB Tower Mounted Amplifier
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.
Figure 1.
Tower Mounted Amplifier (TMA) Unit
Front View
Rear View
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.
BTS
ANTENNA
Tx BPF
Pre-LNA Rx BPF
−
Bias-T
RF Bypass
& Switches
Control, Bias &
Alarm Electronics
Lightning
Protection
Balanced Low
Noise Amplifier
Post-LNA
Rx BPF
Figure 2.
Block Diagram
