CEG-P10 ~ CEG-P20 GSM Series Band selective repeater User`s
Contents
1. CEG P10 CEG P20 GSM Series Band selective repeater User s Manual CenRF Contents Di SAFEN WARNINGS E 2 ENEE Eege 2 1 REASON E 2 2 REASON EE 3 INTRODUC HEH A SYSTEM CHARAGTERIS HOS sesasicesereceseconeccoesccecenasnentscweanenccos sccesenadteatscmeanesucecesassessocneeseeens AA Gg 4 2 APPEARANCE OF CEG P10 CEG P20 GSM REPEATERS cccecececececececececececucececececececes 5 BLOCK DIAGRAM AND WORK PRINCIPLE 000 ccccceeeeesseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeenneees 6 THE ey Ee 7 CEG P10 CEG P20 MAIN TECHNICAL SPECIFICATION ccc eesti 7 1 MECHANICAL SPECIFICATION wicca snc vnntusuia snan scsavndirsnniisnainswdantinneis shas NENEA ASEA i NEEE aaratatieariaers 7 2 ENVIRONMENT LONDITIONS rreri nrre nre rrnni 10 RF TECHNICAL SPECIFICATION RE ZA REQUIREMENTS FOR ADAPTERS ss issssesssssctcsassescvsacueraciacuereusasbeseesasavscesannsacniacascesianeasentannends Be INSTALEA THON HE 8 1 INSTALLATION LOCATION REQUIREMENT REENEN ENNEN 8 2 POWER REQUIREMENT E 8 3 INSTALLATION TOOLS AND ACCESSORY ssssssssssennnnriririirrrrnsssssnnnnnrrrrrrrensssrsnnnnnrrrrrrrrrerens 8 4 INSTALLATION OF DONOR ANTENNA cccccccccccccceesccessssssseeeeeeeeeceeceeeeseeeaaasssseeeeeeeeeeeeeseeeeaaas 8 5 INDOOR ANTENNA INSTALLATION g et tee egene eege Ae gedet 8 6 REPEATER INSTALLATION egener 8 4 1 Installation Steps acca secctessascdctnessvcttusebeateaesseastevebcdetaenbee cdtvees2. System Requirement of CDMA or PCS 1 The total input power level shall be around 50dBm lowest shall be more than 80dBm 2 Test by mobile phone or data card by 3 5 times to make sure Ec lo is more than 7dB and no handovers 3 Ec lo of adjacent carrier shall be 8dB less than that of donor carrier to avoid soft handover The active PN shall be only 1 8 5 Cable layout and connector assembly 1 Keep the type specifications routing direction location and curvature radius of cables in compliance with the design requirement Place cables in good order bend them smoothly and protect the outer skin against any damage 2 Bind cables in good order when laying them on cable racks Keep cables within cable troughs without any cross when you do not bind them When leading cables in or out of troughs use a hole opener to open cable troughs and then install PVC lock nuts to protect them Page 16 of 25 CenRF 3 Keep horizontal cables straight and fasten them stably with a fixing clip every 1 to 1 5 meters with a proper stress 4 Bind and fasten vertical cables every two to three meters to avoid damaging cables or connectors owing to their own heavy weight Take back the cables and re lay them when you have difficulty in pulling them and avoid using a strong force to pull them 5 Separate RF cables from power cables Take proper isolation measures if they have to be placed on the same cable racks owing to the site con
3. 8 5 Indoor antenna installation Proper antennas shall be selected according to the site conditions and the requirement 1 Omni antenna Indoor ceiling omni antenna or whip antenna suitable to installed in the center and radiate all directions Page 17 of 25 2 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 8 6 Repeater Installation 8 4 1 Installation Steps CEG P10 CEG P20 shall be installed in indoor areas only 1 Drill four holes as per the bracket size on the location where the repeater shall be installed and input expanding plastic 2 Fasten the bracket vertically onto the wall by the screws 3 Hang the repeater onto the bracket The other bracket is installed onto the back side of the repeater 4 Connect the power supply and the cables properly to the repeater ports Page 18 of 25 CenRF 5 Check again to make sure the repeater is installed firmly and repeater alarm LED is green g s47 5m The distance between d two hole 8 4 2 Repeater s ports description 1 Outdoor port connected with the donor antenna by cable 2 Indoor port connected with server antenna directly or by cable 3 DC IN connected with power supply MULL H H Ir lt Donor ant wee cable Indoor port pee Outdoor port gt Whip ant
4. Kee Power Adaptor Page 19 of 25 CenRF 8 4 3 Accessories selection Please pay attention to the two points of frequency and impedance during the selection of the accessories All accessories shall support the repeater s frequencies from feeder line antenna and splitter to combiners etc For example the repeater s frequency is GSM900 so all the accessories must support the GSM900 frequency And the repeater s impedance is 50ohm so the accessories shall all be 500hm To use any other impedance of coax will put an extra load on your repeater shorten its life soan and decrease the system performance 8 5 Repeater Settings Please check very carefully all cable connections are correct and firm before running operation test and then carry out following tests 8 5 1 Switch on power After power is on check firstly the alarm and power LEDs Status and definition of POWER indicators gt SSS el Status and Definition of ALARM indicators Status It is working in linearity attention Input signals may be not enough There are overloading or self oscillation strong input signals measures shall be taken It is working in linearity Attention Please adjust MGC to increase the attenuation value till you find the edge point I E the Alarm LED shall stay at green color with intention of turning Orange and let the repeater work at this point D Repeater break down or deep s
5. overloading status of red the equipment would hold higher interference and depression ability at this stage So we try our best to set the equipment near edge point of green and intention of turning orange during engineering Page 22 of 25 CenRF Setting of edge point Switch on the power supply after connection with donor antenna and server antenna and observe ALARM LED m If it shines orange use 1dB as step to reduce the gain until green turns on then increase the gain 1 3dB attenuation value until orange starts to turn on then brings back 1 2dB till green is on then fix the gain and the repeater s downlink output power reaches the perfect status m If it shines green then To check whether the attenuation value has been set if it is use 1dB as step to increase gain until the orange turns on then brings back 1 2dB till green is on again then the repeater s downlink output power reaches the perfect status But if attenuation is not set it indicates that the input power is not enough lt Then please check coverage effect first if the coverage effect is good the engineering has reached expecting target lt But if the coverage effect is not good the donor antenna should be adjusted to get a stronger signals until orange intends to turn on or the effect reaches the target At this stage please make sure Orange color is not generated by self os
6. 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 Page 5 of 25 CenRF 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 osci
7. 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 Page 9 of 25 CenRF 7 CEG P10 CEG P20 Main technical specification 7 1 Mechanical specification Weight 1 2 kg Environment Conditions IP54 Cooling mode Nature cooling 7 2 Environment Conditions 86 kPa to 106 kPa 7 3 RF technical specification oe Im Pom CEG P10 10dBm 10dBm Max Output power CEG P15 gt 10dBm 15dBm CEG P20 15dBm 20dBm MGC Step Attenuation 31dB 1dB step Page 10 of 25 CenRF 600KHz 7 TI r S aaa ee Spurious Emission Group Delay mm E a LED Alarm Out of Band Gain LED 2 ALC 1 5dB Grange ALC 20 25dB Red 7 4 Requirements for adapters Input Voltage Range 100 V 220 V mmn V Total Power Consumption Page 11 of 25 CenRF 8 Installation CEG P10 CEG P20 micro repeater should be used to cover the area indoor and the humidity and temperature of working can affect the re
8. building to enlarge the isolation Please try to place the donor antenna and server antenna in different floors gt Use some obstacles Such as wall 2 The repeater s power is on but the phone is not connected into the network and still can not communicate gt Reason 1 There are loose or wrong connections in the repeater system lt Solution Please try to fasten the connections between the different parts of the system gt Reason 2 The signals received by donor antenna of other operators nearby are too strong For example the other operators signals are 10 dB stronger than the needed signals lt Solution 1 Change the direction of donor antenna or its installation position so that the gap of signal strength between operators are reduced lt Solution 2 Use barriers like buildings to block signals of other operators Page 25 of 25
9. cillation Please take off the server antenna to test if it is self oscillation or not if the Orange turns to be Orange it is self oscillation if it stays as Orange it is not self oscillation Uplink gain setting Standard uplink attenuation values downlink attenuation values Remark Keep in mind that you do not want to have more than a 5dB difference between the uplink and downlink values for optimum system performance and it is better to keep the same attenuation value of Uplink with that of Downlink 8 6 System Test 8 6 1 Check whether the coverage is good 1 Have atest with mobile phone or data card engineering mobile phone is preferred If the signals in most areas have not been improved please check below again The weak input signal leads to the low output power Change the direction of donor antenna or Its installation position or replace donor antenna with higher gain to increase input signal power level Check whether it is necessary to add more server antennas due to barriers whether the repeater s Page 23 of 25 CenRF power is enough please install more server antennas or change with a repeater with higher power level 2 If the signals in small part of the areas have not been improved please check below Check whether the service antenna is installed correctly or not you may try to move the antnena location improve coverage Check if it is necessary to use use a directional antenna Check w
10. dition restriction 6 Correctly fasten all connection parts of the whole system from the antenna to active interfaces to passive interfaces and keep electrical interfaces well contacted Give waterproof treatment to outdoor connection parts 7 Take lightning protection measures for the antenna and feeder system in accordance with the design requirement Avoid deforming the antenna feeder where grounding clips are placed and give waterproof treatment to the feeder 8 Keep exposed indoor cables in good order Install PVC troughs or tubes if the exposed cables are more than 1 meter long Place small passive RF parts such as power splitter in cable troughs 9 Process both ends of RF coaxial cables as follows Keep the same redundant cable length and keep the length of stripped cables to agree with the corresponding connectors Use a proper force to cut the jacket layer or insulation layer and avoid damaging the braid shielded net and cores Weld cores firmly and smoothly with a proper amount of solder without solder projections or nodules Assemble coaxial cables strictly in accordance with the installation specifications Keep a moderate length of heat shrinkable tubes and heat shrink the tubes evenly when adding heat shrinkable tubes to the end of cables Protect the ends of cables against water and dampness Use waterproof tape to give waterproof treatment to exposed cable ends Cut off the end if it is dampened or water soaked
11. elf oscillation Remark For GSM system only Alarm LOW LED works Alarm High LED will only work when the closet is used for DCS PCS or WCDMA repeaters Please note that Alarm LED works on repeater downlink signals only LE the repeater input signals from BTS Page 20 of 25 CenRF 8 5 2 Manual Gain Control MGC Uplink attenuation Downlink attenuation DIP switch uplink attenuation setting KERA nae or Tor or or T or pral on Ton T or on T or paas of on on or Ton Gap ofi off ON ON off baecalololal ON off off 1308 ON off ON ON lor oaas off off off ON ON off fiaa of ON ON ON off Sa ON off of ON ON 10B ag ON ON ON ON off feae of ON off ON on 5 dB or of freas of oft off of ON farast oN ON of ON ON TaB on or off iaa of lon off off ON bag on of ON ON ON BaB off of off ON off ieas ON ON off off ON fs0a8 of ON ON ON ON aB ON of off ON off fogs off of ON of ON bag ON ON ON ON ON ug of ON of ON off pralon of on of fon DIP switch downlink attenuation setting Tat e 7 e e w alel7 e e w l ol7 e e w oas off off off off or maB On ON off ON ab off ON ON off ON as oN of of of of fraas of of TonTon ol on Ton ON of Ton off ON off off off fisas ON off ON ON off faae off off off ON ON aa of ON ON ON off f25B ON off o
12. enn taaaedeekveessctiedabnedbveeeeast 8 4 2 Repe ater s ports description 8 4 3 Accessories selechon 8 5 REPEATER SEM TINGS essene E E 8 5 1 Switch ON DOW CF sveracctesasotceeestanecevedsvansceevebaeractavcansettsdessstenddesscebdersebuomensebesddacaveSiere lt is 8 5 2 Manual Gain Control MGC sisicesccessevectansscevsasivawessetssneveisvncentanssvansageiansseksceanendenwectee 8 5 3 Repeater Commssionmg 96 RR E WE 8 6 1 Check whether the coverage IS OOO 8 6 2 Repeater can not communicate IN Power ON status Page 2 of 25 EE 11 EE T CenRF 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 dama
13. f ON on FON off off fisas ON ON ON ON off Bea of ON of ON ON ff ON off off fieas off off off off ON feras ON ON of ON ON EC vol ON off off off LON fasas off off ON ON ON BaB of of of ON or roan on ON of or fon soas or ON ON ON ON Lon off off On off ba off off ON off ON feras ON ON ON ON ON ai of on of on of praslon ofontorfon Page 21 of 25 CenRF 8 5 3 Repeater Commissioning The curve about device working status Poutput Power A Critical stable point Pinput Power VATT gt lt gt Green LED linear Orange LED Red LED Equipment amplification area p Stable work area Overload zone Output power input signal and their attenuation curve P output Power Output Power Pinput Power Input Power Varr Attenuation value of attenuator Pinput Power Mart Input Power Attenuation value of attenuator Pmax Rate output power Downlink gain setting First the alarm LED only indicates the downlink input power level here we use color of Alarm LED to adjust the gain of the repeater As for the downlink working performance Alarm LED of Green color and with the intention of turning orange is a good working point here we refer as edge point At this time downlink output power and coverage effect are stable And the equipment must be as far as possible away from
14. ged 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 Page 3 of 25 CenRF 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 signal
15. hether it is necessary to add one or more antenna to enhance the coverage of special areas Test coverage 1 Mobility Service antenna Check the signal 2 increase the number of service strength is fit antenna 3 reduce the attenuation values 4 increase the output power 1 Mobility Service antenna 2 increase the number of service Check call quality antenna 3 reduce the attenuation values 4 increase the output power Completion Remark gt Reduce the attenuation values at the same time must ensure the isolation lt Increase the output power recommended ways adjust the donor antenna increased input signal strength Page 24 of 25 CenRF 8 6 2 Repeater can not communicate in Power ON status The power is on but there is signal fluctuation 1 The power is on but it has a signal fluctuation or a flash signal The phone call can not achieved It shall be caused by the insufficient isolation between donor antenna and serve antenna Please take below measures gt Firstly check whether the alarm LED becomes red The red light shows the insufficient isolation gt Secondly adjust the antenna directions or locations or enlarge the distance between them gt Thirdly reduce the repeater s gain by ATT DIP if the above methods don t work The best minimum distance between donor antenna and serve antenna should be more than 10 meters The following measures can also be tried gt Use the roof of the
16. ilter 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 Page 8 of 25 CenRF 6 The repeater system Donor Antenna 4 Cell Tower tive er enna ker Mobile Maia Donor Antenna gt 5 dbi outdoor panel or 7 9dBi wide band Yagi are recommended as donor antenna gt 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 gt 2 3dBi indoor omni ceiling or 5 7dBi indoor panel are recommended gt 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
17. liability of repeater So temperature humidity dust interference power space requirements and other factors should be considered during installation of repeater 8 1 Installation Location Requirement 1 It is appreciated that the repeater is installed in a cool dry and ventilated room without erosive gas and smoke and without leakage on its proof 2 Besides above a cool and ventilated wall of which sun proof and waterproof is expected 3 Besides above common wall tower or high pole is ok 4 Installation height should be easy for RF cable wiring heat dissipation security and maintenance 5 Have a set of independent and stable power supply 6 Have lightning conducer in the building tower or high pole with enough strength or stability 8 2 Power requirement Generally it is AC power supply and the requirement of AC is 100 264VAC 50 5Hz 8 3 Installation tools and accessory Plastic Expansion Bolt M5 24 e Standard accessories Tapping screw M3 27 Standard accessories 3 Isgepge 11 Tore b Engineering owned punch the 4 reciprocating drill 1 wall l Engineering owned punch the 5 Shot bit M3 wall 8 4 Installation of donor antenna The repeater s main function is to improve weak RF signals to an area A simple formula Input power Gain Page 12 of 25 CenRF Output power The signal strength from the outdoor antenna directly affects the efficiency of the indoor coverage It is very important to cho
18. llation 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 amp 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 Yagi Antenna NM Cell Tower ij Tj Er aen ater a 7 d CenRF 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 applicatio
19. nna and server antenna is less than the required distance then the amplified signal R T will back to server antenna donor antenna So it will lead to self oscillation and reduce the coverage area also the bad calling quality could happen at the same time i bea yl li r Outdoor antenna Ke Base staion oo H lindoor Cellular Phone If isolation can t be achieved by the limited distance the roof of the building or other barriers can be used to increase isolation Page 14 of 25 CenRF WR Installation of panel antenna as donor antenna WR Installation of wide directional antenna as donor antenna K en A Ki F i a F 4 LL Pa l Fy li i J Le cl i ar Lei f e j V d d N ff e ya L m Installation of YAGI antenna as donor antenna Page 15 of 25 CenRF m Test the call quality of donor antenna Fix the donor antenna after selecting the best position and adjust slightly its height or angles in order to get the signals with suitable input power level and calling Quality System Requirement of GSM or DCS 1 The total input power level shall be around 50dBm lowest shall be more than 80dBm 2 Test by mobile phone or data card by 3 5 times to make sure the calling quality is good in 95 of the time and no handovers 3 It is requested that the leading BCCH shall be 6dBi higher than the second for professional engineering reference only
20. ns MTBF gt 50000h low failure rate 4 2 Appearance of CEG P10 CEG P20 GSM repeaters C7 SUNRF Figure 1 the front view colors may differ from real products ee ME KLTL ana e Oe a 0 DR i F Figure 2 Side View Page 7 of 25 CenRF 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 Down link ALC MGC Mixer IF SAW Mixer Drive PA Isolator Im mm O A A LNA To sever ant Duplexer From Donor ant PLL eo MS Port BTS Port Duplexer PLL z LNA W LED DW Ka lt q Gi E Gi EH BR isolator PA Drive Mixer IF SAW Mixer ALC MGC DC IN Attenuator UP LINK u P AC IN a amp Switch I POWER SUPPLY 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 f
21. ose the location of the outdoor antenna carefully With this in mind it is not recommended the donor antenna to be installed in an attic m Testing the signal strength received from donor antenna mounted in site by mobile phone Please select the top of the building to install the donor antenna if the total floors are less than 7 and must select a place like balcony or platform lower than 7th floor for the donor antenna if the buildings are over 7 floors The mobile phone shall display full bar signals in location where the donor antenna is installed The phone calls or data transmission are smooth and stable by 3 times testing in location where the donor antenna is to be installed As shown from the above illustration testing the signals from A to E and select a best place that displays full bar signals to install the donor antenna M Selection the installation direction of donor antenna The donor antenna shall point to the direction of the tower and it would be much better to keep line of sight Please select the opposite directions for donor antenna and server antenna If donor and server antennas have to be installed in the same direction please install them only after the signal quality is tested and the self oscillation is avoided If the directional antenna is selected the main directional angle should point to the tower antenna f the performance is poor due to weak signals or poor phone call quality after installa
22. s 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 amp 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 Page 4 of 25 CenRF 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
23. tion please adjust the direction of donor antenna or change its installation position in order to obtain the best calling effect m Donor antenna installation Notes Do not install the donor antenna during the rainy day with lightning Please follow the instructions to install the donor antenna t is a must that the waterproof shall be done to connectors of donor antenna and feeder lines Page 13 of 25 CenRF In order to avoid interference please note that the donor antenna should be far away from the following objects lt Metal ze High voltage line ze RF antenna lt High voltage transformer Repeater is a two way signal amplifier So proper isolation between donor antenna and server antenna is necessary in order to avoid self oscillation About the definition for self oscillation take MIC and loudspeaker for example if it is too close for each other it could make big noise So the repeater can run smoothly if the isolation between donor antenna and server antenna is 15 dB higher than the gain of booster For example if the booster gain is 60 dB then the isolation between donor antenna and server antenna should be 75 decibel The minimum distance between donor antenna and server antenna is 10 meters again the direction of donor and server antennas shall be opposite As shown in the below illustration the booster amplifies the signal R and signal T from the tower at the same time If the distance between donor ante
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