Cerevo GSM900 User manual

User’s Manual for CR-SIG09WB-20
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User’s Manual
GSM900 Mini Repeater
Model: CR-SIG09WB-20

User’s Manual for CR-SIG09WB-20
www.cerevotech.com
Copyright 2010 CEREVO TECHNOLOGY LIMITED.
All rights reserved.
The information contained herein is confidential and the property of CEREVO
TECHNOLOG LIMITED. No Part may be reproduced, disclosed or used except as
authorized by contract of other written permission. No responsibility is assumed
by CEREVO TECHNOLOG LIMITED for any business or personal use, or for any
infringements of patents or other rights of third parties that may result from its
usage.

User’s Manual for CR-SIG09WB-20
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CONTENTS OF DELIVERY
Items Quantity
CR
-
SI Series In
-
building R
epeater
1
9V DC
P
lug
-
in
Power S
upply
1
Screw
4
Plastic
Expansion Bolt
4
User’s Manual
1

User’s Manual for CR-SIG09WB-20
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Content
CHAPTER 1 GENERAL
1.1 Abbreviations
1.2 Safety Warnings
1.3 For Helps
CHAPTER 2 BEFORE GETTING STARTED
2.1 Product Description
2.2 How Does It Work
2.3 Accessories Selection
CHAPTER 3 INSTALLATION
3.1 Overview
3.2 Internal Antenna Installation
3.3 In-building Repeater Installation
3.4 External Antenna Installation
3.5 Repeater Launched
CHAPTER 4 TROUBLESHOOTINGS& F.A.Q
CHAPTER 5 SPECIFICATIONS

User’s Manual for CR-SIG09WB-20
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Chapter 1 GENERAL
1.1 Abbreviations
AGC Automatic Gain Control
ALC Automatic Level Control
ANT Antenna
ATT Attenuation
BTS Base Transceiver Station
CDMA Code Division Multiple Access
dB Decibel
dBm Decibels Relative to 1 milliwatt
DL Downlink
DSP Digital Signal Processor
DPX Duplexer
GSM Global Standard for Mobile Communication
Hz Hertz
IF Intermediate Frequency
LNA Low Noise Amplifier
MGC Manual Gain Control
MHz Megahertz
MTBF Mean Time Between Failures
PA Power Amplifier
RF Radio Frequency
RSSI Receive Signal Strength Indication
SAW Surface Acoustic Wave
SMA Sub-Miniature A Connector
UL Uplink
UMTS Universal Mobile Telecommunication System
VSWR Voltage Standing Wave Ratio
WCDMA Wideband Code Division Multiple Access

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1.2 Safety Warnings
1 Repeater must be installed following user’s manual strictly,
and assure good groundings and lightning for delivering
repeaters stable protection.
2 The power supply of repeater should meet the standards of
security.
3 Any user should disconnect power prior to operate repeater.
4 Do not carry out any modification or internal components
adjustment. The adjustment or repair of the equipment must
only be produced by trained and authorized personnel.
5 For better heat-dissipation, please keep the repeater away
from other electrical appliances, and do not cover repeater
with anything.
6 For the purpose of regular supervision or maintenance,
please pay attentions to the indicator lights during operation.

User’s Manual for CR-SIG09WB-20
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1.3 For Helps
If you need additional copies of this manual, or have questions about products
selection, solution configuration, or need help with installation or operation and
any other technical supports, please contact us:
Cerevo Tech Headquarter
Add: Rooms 1318-20, 13/F, Hollywood Plaza, 610 Nathan Road,
Mongkok, Kowloon, Hong Kong.
Tel：[phone] ext. 3359
Fax: [phone]
Website: www.cerevotech.com
Email: [email protected]
Cerevo Tech Beijing Office
Tel：[phone]
Email: [email protected]
Cerevo Tech U.S. Office
Tel：[phone]
Email: [email protected]

User’s Manual for CR-SIG09WB-20
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Chapter 2 BEFORE GETTNG STARTED
2.1 Product Introduction
The in-building repeaters are designed to improve cellular coverage within a
facility. Combined with interior antennas, and an exterior antenna, the repeater
boosts the signal level for distribution within the interior areas, reducing dropped
calls and expanding the carriers’ service area. It significantly improves the
performance, including both voice and data service. The figure shows a typical
application of an in-building repeater.
In-building Application

User’s Manual for CR-SIG09WB-20
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Panel Introduction
Panel and Interfaces
Internal Structure
Schematic Diagram
Connected with
DC power
Power Light
ATT Dips Power Switch
Connected with
service antenna
(internal antenna)
Connected with
Donor antenna
(
External
antenna
)
Alarm LED

User’s Manual for CR-SIG09WB-20
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2.2 How Does It Work
The single-band indoor amplifiers operating within one band guarantee better
cellular service and reduce dropped calls by enhancing signal strength. The
in-building repeaters work combining with two antennas. One is donor antenna and
the other one is service antenna. The signals obtained from nearest cell tower by
donor antenna, will be filtered and boosted by amplifiers, and then, the amplifiers
retransmit the amplified signals via cable to a service antenna to give subscribers
better service. That is the downlink process (Tower to Cell phone), and vice versa for
uplink (Cell phone to Tower).
How does it work

User’s Manual for CR-SIG09WB-20
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2.3 Accessories Selection
STANDARD PACKAGE, WHICH INCLUDE:
1. CR-SI series in-building repeater
2. 9V DC plug-in power supply
3. Installation Tools
ADDITIONAL EQUIPMENTS REQUIRED FOR INSTALLATION：
：：
：
1. Donor Antennas
2. Service Antennas
3. Coaxial Cables
4. Power Splitters or Couplers (Necessary for multi-antennas or multi-spots
coverage)
Donor Antennas Selection
Donor antennas are applied for obtaining signals from cell tower on DL, and
retransmitting the amplified signals to cell tower on UL. It requires high directional
capability and narrow beam width. Cerevo recommend you use agi Antenna as a
Donor Antenna:
Yagi Antennas
Service Antennas Selection
Service antennas are used for retransmitting the amplified signals to the coverage
areas on DL, and obtaining the signals from cell phones on UL. The selection of
service antennas depends on the actual applications. For example, if if the target
coverage areas need Omni-directional coverage, then omni-directional antennas,
such as ceiling antennas or card antennas, which will be the best application.
Ceiling antennas installed on the ceiling is often used inside personal houses,
offices, restaurants or shopping malls. Card antennas, with lower gain and smaller

User’s Manual for CR-SIG09WB-20
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size compared with ceiling antennas, can be used in places where has more strict
requirement on antenna’s size and its compact appearance.
Ceiling Antennas Card Antennas
If the target coverage area is narrow or just a spot, such as a long aisle or a lift, a
directional antenna, such as panel antenna, will be the best application.
Panel Antennas Log-periodical antennas
For more information about Cerevo Antennas, please visit our website:
www.cerevotech.com
Coaxial Cables Selection
Coaxial cables with lower loss and easy layout is strongly recommended, such as
50 ohm 1/2’’ super-flexible cable or jumper.
0ohm 1/2’’ super-flexible cables Jumpers

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Splitters and Couplers Selection
An in-building mini repeater will be used by combining with splitters or couplers if
it is multi spot coverage, so that the signals will be divided and sent to several
different service antennas in different locations.
Typical Application
Power Splitters Couplers

User’s Manual for CR-SIG09WB-20
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Chapter 3 INSTALLATION
3.1 Overview
The following steps can be followed in the in-building repeater’s
installation
Step1 Determine the internal antennas positions and install the antennas on
roof or wall.
Step2 Install the repeater inside at convenient (considering the power supply)
and safe (far away from other electrical appliances for heat-dissipation)
location.
Step3 Determine the external antenna’s position and point to nearest cell tower
directly, and install the external antenna outside.
Step4 Run cables from repeater to external antenna and from repeater to
internal antenna.
Step5 Power up the in-building repeater.
Step6 Check indicator lights and rotate the external antenna until maximum
signal strength on phone.
3.2 Internal Antenna Installation
First of all, determine the installation location of the internal antennas. For the
360-degree coverage, such as a room, the basic installation principle is that install
them in the center of where the signal needs to be boosted. The higher it is
mounted, the better performance is.

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Omni-directional Antennas Application
For narrow area coverage, such as covering a narrow aisle or garden road, install
the internal antenna (generally use directional panel antenna) at one side of the
target area, and rotate the direction of the internal antenna pointing directly to the
rest of the coverage area.
Directional Antennas Application

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3.3 In-building Repeater Installation
Select a suitable location for repeater installation. The installation location should
be convenient for AC power supply and safe, dry, cool and with adequate
ventilation for heat-dissipation. In addition, considering the cable loss, the
minimize coaxial cable lengths to these antennas is better, in other words, the
repeater should be installed near to service antennas.
After installation location determined, if you select wall mounted, please follow
below installation guide:
1. Drilling fourΦ7 holes on the wall.
2. Put the four screws in to the four holes of repeater body, then install repeater
on the wall and fasten repeater on the wall using plastic expansion bolts.
Amplifier Installation
3. Grounding
Using any conducting wire connect repeater to wall or ground at the Grounding
Access Point.

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Besides wall mounted, you also can select other installation locations, like on a
table or a bookshelf. No matter where you put it on, do not forget to fix the
repeater.
IMPORTANT:
1. The repeater should be placed at a safe, dry and safe location with enough
ventilation.
2. Do not block air flow to the repeater.
3. Be convenient to reach AC power.
3.4 External Antenna Installation
The external antenna, also called donor antenna, is used to obtain the signal from
cell site. It should be mounted on the outside of the building as high as possible.
In addition, the external antenna should point directly, without any other
obstacles, toward the nearest cell tower to obtain optimum signal reception and
transmission.
IMPORTANT:
1. At least 24-inches separation between the external antenna and all persons
must be guaranteed during normal operation.
2. Give line-of-sight path to the donor cell tower.
3. The external antenna should not point toward internal antenna.
4. At least enough separation (Below table has more details) between the
external antenna and internal antenna must be guaranteed to avoid oscillation.
It is better to use some obstacles, such as windows or walls between the two
antennas.

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Separation between Donor and Service ANT
5. If there is no any obstacle between donor antenna and service antenna,
following separation between donor antenna and service antenna must be
guaranteed:
Type of Amplifier Minimum Separation
60dB Amplifier 65 ft
65dB Amplifier 75 ft
70dB Amplifier 85 ft
75dB Amplifier 95 ft
Table of Separations Recommended
3.5 Connections and Running Cables
After the locations of repeater and antennas are determined, you should run the
coaxial cables from the external antenna to repeater and from repeater to internal
antenna. To reduce return loss, you must make sure all connections between
connectors are tightened and secure. When you run the cable, try to avoid too
many bending angles instead of making the cables as straight as possible. If the
bending angles are unavoidable, then the bending angles should not be sharp.

User’s Manual for CR-SIG09WB-20
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IMPORTANT:
1. Only apply power to the repeater after the donor and server antennas are
installed and connected
2. Indoor Port connects to internal antenna and Outdoor Port connects to external
antenna.
3. Make sure all the connections are tightened.
4. Avoid sharp bending.
3.6 Repeater Launched
Verifying
It is the final step to enjoy your cell phone services with excellent signals. Before
repeater powering up, please verify below steps:
1. Turn off all cellular phones and data service cards within 20-feet of the inside
antenna. (Switch them on after repeater launched)
2. Make sure enough separation between the external antenna and internal
antenna. (Refer to above Table of Separations Recommended )
3. Verify whether the external antenna points toward nearest cell tower and does
not point toward internal antenna.
4. Verify all the connections correct and tight. (Indoor Port connects to internal
antenna and Outdoor Port connects to external antenna)
5. Pre-set the Dipswitches down, and these dips can be adjusted if necessary.
Below has more details about dipswitch:
ATT Dip is used to adjust the value of gain on both downlink and uplink.
DOWNLINK Column and UPLINK Column include various attenuating values on
downlink and uplink respectively. The first five dips with sequence number 1 -- 5
are used to control attenuating value on downlink, and the last five dips with
sequence number 6 -- 10 are used to control attenuating value on uplink. Below

User’s Manual for CR-SIG09WB-20
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each sequence number, there is one-to-one correspondence attenuating value in
dB.
Fox example, one repeater has 70dB gain on downlink, and 65dB gain on uplink,
when all the dips are dipped down, it means 0 dB attenuating value on downlink
and uplink. So, the current gains of downlink and uplink are 70dB and 65dB
respectively. While if we dip up the dips of No.1, No.6 and No.7, the current gain
of downlink is: 70dB-1dB=69dB, while the uplink gain reduces 1+2=3dB, which is
65-(1+2) =62dB.
6. Please never connect the cell phone directly to the repeater since this will
damage it.
Powering Up
Plug the 9-volt power supply and switch it on, two indicator lights stand for POWER
and ALARM respectively will be green, it illuminates that the amplifier is ready for
use. Observing the signal bars on your cell phone and trying to make calls, if the
signals strength still is not improved, the reason is that input signals are too low,
you should rotate or reposition the external antenna to get higher input signals
from cell tower. For more, please refer to Chapter 4.