3 antenna feeder installation training(01 august 2006)

 Installation of Antenna Feeder Introduction to connection Components of Antenna Feeder  Installing Lightning Arrester of Indoor Feeder  Installing Outdoor Grounding Clip Outdoor Wat

Course No : EQA C1—020

Composer : Engineering Quality

Dept.

Antenna Feeder Installation Flowchart

Install the antenna

Route the antenna feeder

Ground the feeder

Connect the indoor part of antenna feeder

Prepare the antenna label

 Installation of Antenna Feeder

 Introduction to connection Components of

Antenna Feeder

 Installing Lightning Arrester of Indoor Feeder

 Installing Outdoor Grounding Clip (Outdoor

Water-Proof Measure)

 Grounding Specifications of Antenna Feeder

 Label Preparation Specifications of Antenna

Feeder

Introduction to Connection Components of Antenna Feeder

 The feeder grounding clip is used to fix the antenna on the cabling ladder or tower

 Feeder connectors on the top of the cabinet and antenna feeder are shown in the upper figures

Introduction to Connection Components of Antenna Feeder

Antenna lightning arrester BTS cable label

Waterproof plaster Feeder connector

Introduction to Connection Components of Antenna Feeder

Grounding layer copper skin

Peel off the skin does not too long,

Jumper connection components

Feeder grounding clip components

Key Points for Antenna Installation

 When installing the antenna, ensure that:

 The azimuth and tilt angle of the antenna are consistent with the

design

 The antenna connection and the sector configuration are correct

 Indices of the BTS calibration test and sensitivity test meet the

 The omni-directional antenna is vertical, with error less than ±2°

 The azimuth error of the directional antenna is less than ±5°, and the down tilt error is less than ±0.5°

 The GPS/GLONASS antenna support is fastened reliably The field angle of the antenna is 90° and there is no obstacle around

 The top of omni-directional antenna jacket is in flush with the support or a bit higher than the top of the support

Key Points for Routing the Antenna Feeder

 Bind the jumper connecting with the antenna to the steel frame on the

tower along the cross bar of the support

 Reserve a certain margin when you trim off the cable ties outside the

 When bending down the feeder on the roof along the wall, the part in

contact with the edge of the wall should install the protection tube

 The minimum bending radius of the feeder must be equal to or larger than

20 times of the feeder diameter

 The feeder is not folded or twisted No copper wire is exposed out of the feeder

Routing the Antenna Feeder on the Mast or Tower

The antenna feeder must be straight and not interlaced You need to fix the feeder at an even interval and prepare connectors in compliance with the specifications You also need to apply water-proof measures to the outdoor grounding part and connectors

Installing Outdoor Grounding Clip (Outdoor

Water-Proof Measure)

 Make a waterproof curve before leading the jumper into the cabinet or

leading the jumper out of the feeder window

 Take the lighting protection grounding measure for the lightning arrester of GSM macro BTSs After the grounding cables are gathered, connect them

to the protection grounding bar outside the equipment room

 Directly and reliably fix the feeder grounding clip to the steel bar of the

nearby tower Prepare the feeder grounding clip in compliance with the specifications Apply anti-rust, erosion-proof and water-proof measures to the connection of grounding clip

 The grounding cable of feeder clips should extend from up to down The angle between the grounding cable and the feeder cable should not be more than 15 degrees

 If the tower is more than 60 meters tall, add one feeder grounding clip to the feeder in the middle of the tower

Installing Outdoor Grounding Clip (Outdoor Proof Measure)

Water- After the feeder leaves the tower, lay the feeder on the roof (or cabling rack) for a certain distance before leading the feeder into the equipment room If this distance exceeds 20 meters, add one lightning grounding clip

on the roof (or cabling rack)

 When routing the feeder from the tower top to the equipment room,

ground the feeder at three points which fall into the following ranges: one meter after the feeder leaves the platform of the tower, one meter ahead

of the outdoor cabling rack after the feeder leaves the tower, and one

meter away from the feeder window Bundle the feeder reliably at the

grounding point and apply water-proof measures

 If the feeder is less than 10 meters, ground the feeder at a point only

 Avoid contact between the connector of the feeder or lightning arrester and the cabling rack

Introduction to Grounding Clip of Antenna Feeder

Fix and fasten the grounding clip

The waterproof wound completed

Wind the first-layer of the waterproof plaster opposite from the direction of feeder routing

Preparing the Feeder Grounding Clip

Fix the grounding cable on the cabling Rack and fasten the screws Wind the secondly -layer of the tape opposite to

the direction of feeder routing

Preparing the Feeder Grounding Clip

 Feeder grounding clip installation specification — Winding the tape on the grounding clip

 Wind the tape from bottom upward layer by layer, and then from top downward, and finally from bottom up

 The upper layer of the tape should cover about one third of the lower layer

Grounding the Feeder when Routing the Feeder Outdoors

 Ground the feeder one to within one

to two meters under the antenna

Feeder must be grounded on the iron

tower If the feeder is routed on the

mast, you can only ground the feeder

at the bottom of the mast because you

cannot install a fixing grounding clip on

the mast In practice, you need to

ground the feeder according to the field

Grounding the Feeder Within One Meter Away from the Equipment Room

Ground the feeder within one meter away from the equipment room.

 Reserve an appropriate margin on the outdoor cable tie of the feeder.

Make a water-proof curve properly

Seal the feeder window properly

Make a water-proof curve before leading the feeder into the equipment room Seal the feeder window properly Reserve

an appropriate margin on the cable tie.

Installing Feeder Tube Clips

 Use the feeder tube clips to fix the feeder on the cabling ladder and tower

 When the antenna is installed on the mast, it is not convenient to use the feeder tube clip for fastening In this case, directly use cable ties to fix the feeder and reserve an appropriate margin on the cable tie

Installing and Bundling Feeders inside the Cabinet

 Bundle the RF cables with appropriate tightness Do not make too tight, in the case, the feeder is damaged Meanwhile, fasten the RF connectors and cover the

RF connectors not in use with protection caps No RF connectors can be

exposed

Grounding Feeder Lightning Arrester

 The grounding point of the feeder lightning arrester must be reliably connected Meanwhile, avoid direct contact between the lightning arrester with the cabling ladder Insulation measures are recommended (You can either use the

insulation tape or the feeder skin for insulation purpose.)

Installing Feeders on the Cabinet Top

 Secure the connection between the feeder connector and cabinet top After the antenna connector is ready, use the heat-shrinkable tube to coat the connector The heat-shrinkable tube be agreeable in appearance and uniformed in

specifications All connecting screws must be fastened

Effect after the Outdoor iSite Installation is

Preparing Feeder Labels

 Feeder labels are generally required

at several points: under the antenna, below the tower, at the entrance to the equipment room, at the connection point of the lightning arrester, and on the top of the cabinet Generally, places where labels are attached and the label directions must be consistent

on different types of cables.

Thank You