CenRF CEG-P10 User manual

CEG-P10 ~ CEG-P20
GSM Series
Band selective repeater
User’s Manual

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Contents
1. SAFETY WARNINGS .....................................................................................................................................................3
2. WHY REPEATER............................................................................................................................................................4
2.1. REASON 1 .................................................................................................................................................................4
2.2. REASON 2 .................................................................................................................................................................4
3. INTRODUCTION.............................................................................................................................................................6
4. SYSTEM CHARACTERISTICS......................................................................................................................................7
4.1. FEATURES: ................................................................................................................................................................7
4.2. APPEARANCE OF CEG-P10 ~CEG-P20-GSM REPEATERS.........................................................................................7
5. BLOCK DIAGRAM AND WORK PRINCIPLE................................................................................................................8
6. THE REPEATER SYSTEM.............................................................................................................................................9
7. CEG-P10 ~ CEG-P20 MAIN TECHNICAL SPECIFICATION.......................................................................................10
7.1. MECHANICAL SPECIFICATION.....................................................................................................................................10
7.2. ENVIRONMENT CONDITIONS......................................................................................................................................10
7.3. RF TECHNICAL SPECIFICATION ..................................................................................................................................10
7.4. REQUIREMENTS FOR ADAPTERS: ...............................................................................................................................11
8. INSTALLATION.............................................................................................................................................................12
8.1. INSTALLATION LOCATION REQUIREMENT ....................................................................................................................12
8.2. POWER REQUIREMENT .............................................................................................................................................12
8.3. INSTALLATION TOOLS AND ACCESSORY.......................................................................................................................12
8.4. INSTALLATION OF DONOR ANTENNA............................................................................................................................12
8.5. INDOOR ANTENNA INSTALLATION ....................................................................................................................................17
8.6 REPEATER INSTALLATION ...............................................................................................................................................18
8.4.1. Installation Steps............................................................................................................................................18
8.4.2. Repeater’s ports description ..........................................................................................................................19
8.4.3. Accessories selection.....................................................................................................................................20
8.5. REPEATER SETTINGS ...............................................................................................................................................20
8.5.1. Switch on power.............................................................................................................................................20
8.5.2. Manual Gain Control (MGC) ..........................................................................................................................21
8.5.3. Repeater Commissioning...............................................................................................................................22
8.6. SYSTEM TEST ..........................................................................................................................................................23
8.6.1. Check whether the coverage is good.............................................................................................................23
8.6.2. Repeater can not communicate in Power-ON status.....................................................................................25

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Preface
This user’s manual describes the installation, commissioning and maintainance of CEG-P10
~ CEG-P20 repeaters.
Please do read the user manual carefully before installing and maintaining CEG-P10 ~
CEG-P20 repeaters.
The information in this manual is subject to change without prior notice
Opinions are welcomed about the manual improvement.
1. Safety Warnings
Users must follow the below principles:
Repeater should follow system requirement of communication equipment, assure good
groundings and lightning protection.
The power supply voltage of repeater should meet the standards of security requirement; any
operation shall be carried out only after cutting off power in advance. Only the professional is
authorized for the operation.
Do not dismantle machine, maintain or displace accessories by yourself, because in
this way, the equipment may be damaged or even get an electric shock.
Do not open the repeater; touch the module of repeater, or to open the cover of
module to touch the electronic component, the components will be damaged due to
electrostatic.
Please keep away from heating-equipment, because the repeater will dissipate heat during
operation. And do not cover booster with anything that influences heat-dissipation.

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2. Why repeater
2.1. Reason 1
1) Blind or weak signal areas are formed if the buildings are too far away from BTS, or the buildings
themselves shield or absorb the signals.
2) There are too many complicated signals in the higher part of the buildings, therefore ping-pong switching
effect has been formed and the signals fluctuate a lot, there are annoying noises during phone calls and
there are dropped phone calls accordingly.
3) Elevators and basements are well-known blind areas.
4) Downtown areas of the cities, congested with many high-rise buildings are usually the weak or blind
areas.
2.2. Reason 2
The remote villages, mountains, hills, valleys, etc. are mostly scarcely populated areas with quite few mobile
users, so the main target is to send coverage to these areas, and it will not be cost effect to install a BTS tower,
therefore a booster is a quite good option.
Can we not use mobile phones? The answer is definitely NO. But it might be much more miserable that the
communication can’t be achieved due to no or weak signals though there is a mobile phone.
Will your customers stay comfortable when there is no smooth communication in your shops or restaurants?
Will your business be influenced if your clients couldn’t call you through due to weak signals in offices?
Will your life be influenced if your mobile is always “out of service” at home when your friends call you?
How to solve the problems?
Best Solution:
Plug & play: Purchase a set of booster solution and install it at your home, offices, and plug on the
power and immediately you would be able to enjoy the full bar and high quality signals!

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Question: Will booster increase the RF radiation?
A: No, it will decrease instead.
As it can be searched easily through internet, the tower would “order” the mobile phone to increase its output
power, in order to ensure successful connection when the mobile signal bar is few, there will be stronger mobile
output power level when the mobile signal bar is less and the strongest one can reach 2W (GSM); moreover,
the mobile phone is usually as near as less than 5cm to human body when people are in phone calls. Not only
it influences badly the human bodies, but also run out of the battery power much more quickly; usually the
mobile phone gets hot in such status.
The maximum power level of CEG-P10 ~ CEG-P20 is 0.01W, and it decreases to be maximum 0.003W when
reaching server antenna. And since the server antenna is installed over the ceiling or onto the wall, there are
usually more than 3 meter away from the human body, 3meter away means at least 40dB propagation loss, or
10000 times less, 0.0000003W, therefore it is too weak to influence human bodies though it is still a very good
signal for mobile phones.
And when a booster is installed, it improves the mobile signals in the coverage, and the successful phone call
can be connected easily with a much less power level of the mobile phone, thus it will reduce tremendously the
RF radiation.

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3. Introduction
This CEG-P10 ~ CEG-P20 full duplex mobile communications repeater from CenRF is the perfect solution for
providing a wireless improvement in the cellular reception of a home, office, restaurant, VIP Room, apartment,
building or shopping mall, in the quickest time possible. One repeater covers 300 to 600 square meters.
It is designed to improve the call quality of an area by receiving, amplifying and re-transmitting signals of the
base station into a specified area via the server antenna of the repeater.
This repeater has Manual Gain Control (MGC) feature that enables engineers to reduce the gain of the repeater
manually if oscillation is detected or too strong input power level during installation, this will help to get the best
coverage effect without any interference back to mobile network.
And to maintain safe and specific output signal levels during the repeater’s operation, this repeater has a built-in
signal oscillation detection circuit to adjust the gain automatically so as to avoid interference to the cellular network,
also it gets color changing LED’s indicate its environmental status: the Alarm LED’s located on the front of the unit
(Alarm Low & Alarm High) will change color from green to orange or red, (depending on the input power level) if the
system detects signal oscillation in either band or, if the input signal is beyond a safe limit.
Below diagram shows how simple and fast CEG-P10 ~ CEG-P20 repeater system is installed and works
effectively. One Yagi antenna, as a donor antenna, has been installed at the top of the roof to pick up good mobile
signals from outside, and send through a 5D-FB cable to a CEG-P10 ~ CEG-P20 repeater to be amplified
significantly, then the output signals are divided into two signals by a 2way splitter, sent to two indoor omni antennas
and finally transmitted into the coverage area. Very clear phone call or high speed mobile data services are
immediately effected within the area.

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4. System Characteristics
4.1. Features:
CE Certified
Streamline shape
Excellent out of band rejection.
Wide power supply range and low power consumption
High-integration (One board to contain low-noise amplifier, frequency selection module, power
amplifier module, both uplink and downlink one for all)
Manual gain control provides a variety of applications.
MTBF>50000h, low failure rate
4.2. Appearance of CEG-P10 ~ CEG-P20-GSM repeaters
Figure 1 the front view (colors may differ from real products).
Figure 2 Side View

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5. Block diagram and work principle
CEG-P10 ~ CEG-P20 is basically a bi-directional amplifier, the downlink signals are received by the repeater
from BTS by the donor antenna, filtered by its internal duplexers and FC unit, amplified by low noise amplifier (LNA)
and downlink PA unit, and then sent via the server antenna to the coverage area. The bandwidth is operators’
working frequency only.
The uplink signal of mobile terminal from the coverage area is input via the server antenna, then filtered by
duplexers and FC unit, amplified by the uplink low noise amplifier (LNA) and the uplink PA unit and finally sent via
the donor antenna to the BTS.
Modules in the system diagram:
Duplexer: The main purpose of duplexer is to combine downlink and uplink to share the same
antennas, the duplexer is composted of one pair of band pass filter that can not only reject the
spurious interference, but also increase the isolation of Uplink and Downlink
LNA: LNA is the first active sub system of the repeater, of which low noise and high linearity is
requested under strong input signals. LNA is the major sub system that determines the noise figure
of the repeater system.
IF Filter: IF SAW filer is adopted in FC sub system to reject signals of other operators to make sure
the signals clean and increase the UL and DL isolation.
PA: The power amplifier sub system helps the repeater to reach its targeted output power, linearity
of which decides the linearity of the repeater
Power supply is to supply power electricity to all repeater’s modules

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6. The repeater system
Donor Antenna:
5~7dbi outdoor panel or 7~9dBi wide band Yagi are recommended as donor antenna.
Function: Pick up donor signals from the BTS and send to the repeater by cable; the received
signals’ power level and quality influence a lot on the coverage effect. Donro antenna also
transmit the uplink signals from the repeater to BTS.
Server Antenna:
2~3dBi indoor omni ceiling or 5~7dBi indoor panel are recommended.
Omni antenna (Indoor ceiling omni antenna or whip antenna), suitable to installed in the center
and radiate all direction; It is better to use a directional panel antenna or Yagi when the coverage
shape is long and narrow (corridors, long row of houses in two sides, tunnels or elevators or rural
open space)
Cables: LMR 300 or 400, 5D or 8D –FB coax cables are recommended.
Splitters or couplers: when the building structure is too complicated or there is big loss due to thick
walls, etc., splitters or couplers shall be used so that more antennas can be installed in more areas
to distribute the signals to each corner of the coverage area.
Power Box including electricity meter, air switch and groundings, some sites might need surge
arrestors.

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7. CEG-P10 ~ CEG-P20 Main technical specification
7.1. Mechanical specification
SN Item specification
1 Dimensions 218x 155 x 65 mm
2 Weight 1.2 kg
3 Environment Conditions IP54
4 Cooling mode Nature cooling
7.2. Environment Conditions
SN Item specification
1 Operating Temperature -25°C to +55°C
2 Storage Temperature -40°C to +80°C
3 Humidity 5% to 85%
4 Air Pressure 86 kPa to 106 kPa
7.3. RF technical specification
Electrical specification Uplink Downlink
Frequency Range 880 ~ 915 MHz 925 ~ 960 MHz
CEG-P10 ≧60dB ≧60dB
CEG-P15 ≧65dB ≧65dB
Max. Gain
CEG-P20 ≧70dB ≧70dB
CEG-P10 ≧10dBm ≧10dBm
CEG-P15 ≧10dBm ≧15dBm
Max. Output power
CEG-P20 ≧15dBm ≧20dBm
Band width（-3dB）35MHz
MGC (Step Attenuation) ≧31dB / 1dB step