gsm tma installation manual v1

8/10/2019 GSM TMA Installation Manual V1

1/14

TMA Installation Manual

Page 1 of 14

Contents

1 SYSTEM OVERVIEW ........................................................................................................ 4

1.1 OVERVIEW.................................................................................................................... 41.2 SYSTEM STRUCTURE.................................................................................................... 5

1.3 REPRESENTATIVEAPPLICATIONS.................................................................................... 5

1.4 FEATURE HIGHLIGHTS................................................................................................... 5

2 SYSTEM INSTALLATION ................................................................................................. 6

2.1 INSTALLATION OVERVIEW............................................................................................... 6

2.1.1 REQUIREMENTS OF INSTALLATION SITE........................................................................ 6

2.1.2 REQUIREMENTS OF CAUTERY-FREE AND SHOCK-RESISTANT.......................................... 6

2.1.3 REQUIREMENTS OF ILLUMINATION,AIRINESS AND FIRE PROTECTION.............................. 7

2.1.4 REQUIREMENTS OF LIGHTNING PROTECTING AND GROUNDING...................................... 7

2.1.5 INSTALLATION PREPARATION....................................................................................... 7

2.2 TMAINSTALLATION........................................................................................................ 8

2.2.1 INSTALLATION OF THE TMAON THE MAST.................................................................... 9

2.2.2 INSTALLING TMAGROUND CABLE............................................................................... 9

2.2.3 INSTALLING COAXIAL CABLE..................................................................................... 10

2.3 PDUINSTALLATION...................................................................................................... 11

2.3.1 MECHANICALATTACHMENT OF PDU .......................................................................... 11

2.3.2 STANDARD WALL MOUNT.......................................................................................... 11

2.3.3 MASONRY WALL MOUNT ............................................................................................. 112.3.4 RACK MOUNT.......................................................................................................... 12

2.3.5 INSTALLATION OF PDUCABLES................................................................................ 12

2.4 INSTALLATION OF BIAS-T .............................................................................................. 13

2.4.1 MECHANICALATTACHMENT AND CABLE CONNECTIONS.............................................. 13

2.4.2 LIGHTNING PROTECTION.......................................................................................... 14


2/14


Page 2 of 14

Table List

1 OVERVIEW INSTALLATION FLOW ................................................................................. 6

2 INSTALLATION FLOW OF TMA UNIT ............................................................................. 9

3 INSTALLATION FLOW OF PDU ..................................................................................... 13

4 INSTALLATION FLOW OF BIAS-T ................................................................................ 13


3/14


Page 3 of 14

Figure List

1 SYSTEM OVERVIEW ........................................................................................................ 4

2 SYSTEM STRUCTURE ..................................................................................................... 5

3 TMA UNIT .......................................................................................................................... 8

4 PDU UNIT ......................................................................................................................... 11

5 PDU INSTALLATION ....................................................................................................... 12

6 PHOTO OF BIAS-T UNIT ............................................................................................... 13

7 BIAS-T UNIT .................................................................................................................... 14


4/14


Page 4 of 14

1. System overview

1.1 Overview

A TMA is used to reduce the system NF and therefore increase sensitivity.

As previously mentioned a TMA is a LNA mounted as close as practical to the sector Rx

antenna. In this way, the cable losses are negligible and do not significantly affect system

noise figure.

Figure 1 System Overview


5/14


Page 5 of 14

1.2 System Structure

Figure 2 System Structure

System is composed of four parts: TMA, power supply unit (PDU), Bias Tee and cable.

TMA is installed at the end of feeder line neighboring the antenna.

PDU is installed by receiving and sending system of BTS or in the frame of receiving

and sending system of BTS

Bias Tee is connected directly to the feeder line and PDU supplies power to TMA via

Bias Tee and the feeder line or supplies power by independent DC feeder line.

1.3Representative Appl ications

Applicable for both directional and omni BTS

Applicable for signal coverage of roads, villages, lake and sea, and open fields in remote andboundary areas

Applicable for signal coverage of remote mountainous areas

Applicable for signal coverage of expressway

Applicable for the enhancement of donor signal for IBS from micro BTS

Applicable for the compensation of introducing of noise and interference caused by long feeder

(around 50 meters)

RX-D1

RX-D2

DC

LNA

RF-block

TX

Antenna

Bypass

RF to/form BTS

DC from APDU


6/14


Page 6 of 14

1.4 Feature Highlights

Lower Noise Figure

Step Adjustable Gain

High reliability, Stability, Automatic Level Control

Feed-line supply Power, Convenience fixable

Automatic Bypass Protection

Water, Fog, Lighting Strike Resistance

Forward & Backward Power Protection, Temperature Protection Function

2. System InstallationInstallation Flow

Table 1 Overview Installation Flow

Step Description

1 Installation preparation

2 TMA installation by the antenna

3 PDU installation inside the BTS

4 Bias-T installation inside the BTS

2.1 Installation Overview

2.1.1 Requirements of installation site

1. Requirements of the wall for outdoor unit installation

The wall should be water-resistant, dry, non-caustic and without high-voltage power leaking.The cabinet should be mounted in the wall which bearing capacity is more than 40kg.

The concrete wall and brick wall are recommended, which can fix expanded screws.

Masonry wall or sandy-dust wall is not suitable.

2. Requirements of the mast for outdoor unit installation

The mast should be stable, dry, non-caustic and without high-voltage power leaking.

The mast should be suitable for installing the U-bolts.


7/14


Page 7 of 14

2.1.2 Requirements of cautery-free and shock-resistant

To keep the safety of products and operators, the installing location must be without caustic

or poisonous fog and gas. The wall which cant meet the requirement of shock-resistantmust be pined up or fixed.

2.1.3 Requirements of illumination, airiness and fire protection

The installation site should have enough illumination for installation and maintenance need.

Flammable and explosive material should not be near to the site. The portable fire

extinguishers must be setup around in regular distance to prevent fire.

2.1.4 Requirements of lightning protecting and grounding

The cross section of grounding cable must be more than 25mm2.

The grounding cable should be connected to the ground unused connector.

Keep the grounding cable as short as possible.

Warning: The lightning arrestor must be installed between Bias-T and the BTS;

otherwise the TMA will be damaged because of the lightning.

2.1.5 Installation preparation

The following technical files and tools are needed:

1. Technical files

Contract, equipment scheme chart.

Designing and construction drawing of installation site.

TMA User Manual

2. Tools and meter

Multi meter

Cross point screwdriver

Slotted screwdriver

Wrench

Drill

Spectrum analyzer

Signal generator

VSWR testing device

N connector

RF testing cable

GPSTest mobile


8/14


Page 8 of 14

Telescope

2.2 TMA installation

Each Clear Gain Tower Top Amplifier (TTA) or Mast Head Unit (TMA) includes a bracket kit,

ground cable and hardware for proper installation on a tower. U-bolts are provided for

mounting the TMA.Figure 3provides an exploded view. The kit may be used for tube

diameter 30-140 mm

Figure 3 TMA unit

2.2.1 Installation of the TMA on the Mast

Note:All hardware is specified in metric units.

Before any installation, check that the Clear Gain TMA has no visible damages or

defects.


9/14


Page 9 of 14

Note: The Clear Gain TMA must always be installed so that the

connectors point downward. Not more than a 45-degree installation angle is

recommended.

Installation Flow

Table 2 Installation Flow of TMA unit

Step Description Impression

1 Prepare the brackets parts

Note:Totally have 4 packages of brackets and

each package has 3 different types.

2 Place the TMA so that you can attach the bracket

parts into the unit. (Two poles)

Note:The threads are sensitive to damages.

3 Place the TMA so that you can attach the bracket

parts into the unit. (One pole)

Note:The threads are sensitive to damages.

4 Temporarily remove the connector protector

plugs, inspect the 7/16 DIN connectors for

damage, and return the connector protector

plugs.

5 Place the Clear Gain TMA as close to antenna

as possible. Attach the rest of the fasteners to

the bracket system. Fasten the bracket parts

with poles. Verify that the TMA is tightly in place.


10/14


Page 10 of 14

2.2.2 Installing TMA Ground Cable

Good grounding of the Clear Gain TMA is important to protect the unit against voltage

surges.These surges could be caused by, for example, lightning. Install the ground cable as

follows:

1. Connect the ground cable to TMA side using M5 attachment screw and washer.

2. Connect the other end of the cable to a good ground (site ground) with a reliable joint.

GROUNDING and BONDING CONSIDERATIONS

Grounding is very important in tower applications. Shipped with each TMA, is a #6 AWG,3-foot ground cable with single hole crimp lug connectors on both ends. Installationhardware is provided to attach one end to the TMA.

1. Keep ground wire as short and direct (no loops or knots) as possible, secure it to a

good ground point (metal to metal).

2. Following local grounding practices the single hole lug is usually re-terminated by the

tower crew with a double hole lug and bolted to a dedicated tower ground bus.

3. In the absence of a dedicated ground, the tower structure itself can be used by using

an exothermic weld joint (not very common) or a mechanical ground clamp. If a clamp

is used, it must be very tight and protected from corrosion effects with a corrosion

preventative compound. It is recommended that the ground integrity resistance at

any mechanical junction be checked during periods of regular tower maintenance.

4. If ground cable length is too short, customer may make a longer ground cable (#6

AWG) as long as all the mechanical connections are tight and clean.

2.2.3 Installing Coaxial Cable

Caution: Before connecting any coaxial cables, ensure that the BTS transmitter output

is turned off and that precautions are taken to ensure that the transmitter cannot be

activated during the equipment installation.

Two short coaxial jumpers should be pre-made. One will connect the BTS port to thehard line and the other will connect the ANT port to the antenna.

Most installations require two good quality flexible coax jumpers, normally terminated

with

7/16DIN-7/16DIN plug connectors. Check gender of hard line and check if Antenna

pigtail is present, adjust accordingly for a correct match.

The coaxial feeder that runs from the base station should be hooked to the BTS port ofthe TMA using jumper cable. The reason for the jumper cable is to ensure that


11/14


Page 11 of 14

mechanical forces caused by temperature change will not damage the TMA connectors.

Tighten the connectors to 25-30 Nm (18.43-22.13 ft-lbs.) torque.

To improve the reliability of the connection, the connector joint can be protected. This

can be done, for example, by installing specific weatherproof tape over the cable

connectors.

Loose cable should be fixed to the tower using cable brackets.

2.3 PDU Installation

2.3.1 Mechanical Attachment of PDU

Warning: Never install the Power Distribution Unit in a wet location or during a lightning

storm. When installing on modifying communication lines, disconnect lines at the

interface before working with uninsulated lines or terminals to prevent electrical shock.

The PDU should be mounted in accordance with local code using appropriate hardware(customer provided). The PDU has two mounting holes on either side, as shown inFigure 4. Below are guidelines for standard wall mount, masonry wall mount, and rackmount of the PDU.

2.3.2 Standard Wall Mount

When mounting the PDU on a wooden or metal surface, it is recommended that it be

installed on pressure-treated plywood (customer provided) with a minimum thickness of

0.75-inch (19.0 cm). The plywood should be firmly secured to the wall studs.

2.3.3 Masonry Wall Mount

When mounting the PDU on a masonry surface, it is important that the bolts (especially

the upper bolts) be located as close as possible to the center of bricks or blocks.


12/14


Page 12 of 14

Figure 4 PDU unit

2.3.4 Rack Mount

A mounting bracket, shown in Figure 5, is available that will allow the PDU to be mounted on A

19-inch rack. If mounting the PDU on a rack, refer to the installation drawing provided with the

mounting bracket.

Figure 5 PDU Installation

2.3.5 Installation of PDU Cables

Installation Flow

Table 3 Installation Flow of PDU


13/14


Page 13 of 14

Step Description

1 Connect the ground cable under the grounding screw on the PDU front panel.

Connect the other end of the cable to the site grounding pole.

2 Connect the alarm cable leads to the base station or site

alarm system. Use either "Normally Open" or "Normally Closed" contacts.

3 Connect the other end of the alarm cable to the PDU "ALARM" connector.

4 Connect the power cable to the site DC power connector. (The power cable

has three leads. Red is positive, Black is negative, and Yellow/Green is for

ground.)

5 Connect the power cable to the "INPUT" connector on the PDU front panel.

2.4 Installation of Bias-T

2.4.1 Mechanical Attachment and Cable Connections

Caution : Prior to installing any Bias-T unit, ensure that the BTS transmitter output is turned off

and those precautions are taken to ensure that the transmitter cannot be activated during the

equipment installation.

The BIAS-T is designed to fasten directly into BTS coax-connector or directly to the feeder

cable. There is no additional mounting hardware required. The Bias-T can be installed inside

or outside. Connect the Bias-T as follows:

Installation Flow

Table 4 Installation Flow of Bias-T

Step Description

1 Connect the ground cable to the Bias-T grounding pole (see Figure 17).

2 Connect the other end of the ground cable to the site grounding pole.

3 Connect the BIAS-T "BTS" connector directly into the BTS coax-connector.

4 Connect the coaxial run going to the TMA to the "ANT" port of the BIAS-T.

5 Connect the mini coax cable to the SMB connector of the BIAS-T unit.

6 Connect the other end of the mini coax cable to the PDU front panel SMB connector


14/14


Page 14 of 14

Figure 6 Photo of Bias-T unit

Figure 7 Bias-T unit

2.4.2 Lightning Protection

Warning: The lightning arrestor must be installed between Bias-T and the BTS,

otherwise the TMA will be damaged because of the lightning.

Ground Location

gsm tma installation manual v1

Documents