CEW-P10 ~ CEW-P20 WCDMA Series Band Selective Pico
Contents
1. 4 System Characteristics 4 1 Features 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 gt 50000h low failure rate 4 2 Appearance of CEW P10 CEW P20 W repeaters Figure 1 the front view colors may differ from real products zg gel M i Pee mee tee engen 1 i I I Figure 2 Side View Page 6 of 24 CenRF 5 Block diagram and work principle CEW P10 CEW 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 mm A LNA To sever ant BTS Port Duplexer L a LNA v LED Monitor 8 Ka lt q AF Gi Wm 98 BR isolator P2. CEW P10 CEW P20 WCDMA Series Band Selective Pico Repeater User s Manual CenRF Contents t SAFETY ET e 3 2 WHY REPEATER aaa ceca ecetere eet sec ce seated eee clue desc beached vacant acne weeds a a a aae 4 SC E e Hil RE 4 E e 4 3 INTRODUCTION E 5 A OYOTEM CHARACTERISTICS E 6 Mele FEAREN E E 6 4 2 APPEARANCE OF CEW P10 CEW P20 W REPEATERS 0sccccccssececceseeeceesseecceuseeecsaeeeceaseeseeageeessageeessageesnsaseeeess 6 5 BLOCK DIAGRAM AND WORK PRINCIPLE ccceeeeeeseeeeeeseeeeeeeceeeesnseeeeeeeeoenssseeeeseeeooensseeeeeeeooensssensesesseeoonnnas 7 6 THE REPEATER SYSTEM icc ere et a Ea aa eterna acta cn a A aaa EE neaiues 8 7 CEW P10 CEW P20 MAIN TECHNICAL SPECIFICATION ccccssssssseeeeeeeceesseeeeeeeeeeoeenseeeeeesecooensseeeeesseeeoeeanss 9 EN MECHANICAL OPECIFRIGATION oprasi EEE E E E E 9 T2 ENVIRONMENT CONDITIONS sisernienei ine E a E e R 9 7 0 RF ERNEIEREN eene 9 7 4 REQUIREMENTS FOR ADAPTERS ccccccccccsssseeceeccccccossseneeeeeceecassseneeeeessecasseneeeeeeseecauseneeeseescasseneeeeeeeesaasseaeeesesseseseees 10 INS IN ME 11 8 1 INSTALLATION LOCATION REQUIREMENT s0 ccscsecessssesseceessccesesceaeseneccecessessecsenecedasseesseesensnedeescuecadecensseaateeecsecesesees 11 0 PONER el Pe er ae ee es eee 11 8 3 INSTALLATION reel 11 8 4 INSTALLATION OF DONOR ANTENNA ccccsccccsseeeseeeecscccssenseeceesenecesseeseececseccesseusceneecdecesseeetencecccusce
3. Tatas on ON on ON ON el of ON of On off fataB On of on ln Page 20 of 24 CenRF 8 5 3 Repeater Commissioning Testing Effective Downlink Path Loss The downlink path loss between NODE B and the donor antenna is as follows Lp link PNope sB Paonor Paonor iS the downlink signal power received at the donor end Suppose The maximum transmitting power of NODE B is 20 W and the overhead power accounts for 10 When there is no traffic the transmitting power of NODE B is as follows Pnope B 20W 10 2W 33 dBm The effective downlink path loss is as follows LD ink 33 Paonor Budgeting Maximum Uplink Low Noise Power Output at Donor Port of Repeater Therefore the repeater UL gain shall be Gup SLp ink NF NF is the repeater Uplink Noise figure Suppose Gpoise Lp link NF Downlink gain setting There are three factors to be followed to set DL gain of indoor repeater A Meet with isolation requirement of G1 Liso 10dB The repeater s gain shall be less than Isolation 10dB and if it allows the gain shall be less than Isolation 15dB D Meet with UL noise Gyoise The UL noise from the repeater shall be less than the thermal noise floor when reaching NODE B tower C The DL gain G2 shall be set so that the repeater can reach its full downlink output power D Finally to set the gain Gp_ MIN G1 Gproiset8dB G2 UL Gain GuL MIN G1 H EE G2 Downlink gain setting procedures A Use engineeri
4. 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 Page 3 of 24 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 sen
5. A Drive Mixer IF SAW Mixer ALC MGC DC Im Attenuator UP LINK my AC IN a i amp Switch I POWER SUPPLY Duplexer From Donor ant PLL H SS TS MS Port Pi 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 Page 7 of 24 CenRF 6 The repeater system Donor Antenna 4 Cell Tower 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 Don
6. antenna and server antenna should be 75 decibel E 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 antenna 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 fu bt il Ili I r Base staion Outdoor antenna Ke i EI T 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 13 of 24 CenRF WR Installation of panel antenna as donor antenna mM Installation of wide directional antenna as donor antenna m Installation of YAGI antenna as donor antenna Page 14 of 24 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 WCDMA or AWS 1 The total input power level shall be around 50dBm lowest shall be more than 70dBm 2 Test by mobile phone or data card by 3 5 time
7. d LED off after 5 seconds red color 7 4 Requirements for adapters Input Voltage Range 100 V 220 V 264 V Ge Total Power Consumption Page 10 of 24 CenRF 8 Installation CEW P10 CEW P20 micro repeater should be used to cover the area indoor and the humidity and temperature of working can affect the reliability 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 Hanging folder Standard accessories Engineering owned punch the 4 reciprocating drill wall l Engineering owned punch t
8. d 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 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 24 CenRF 3 Introduction This CEW P10 CEW 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 Contr
9. eater 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 Page 23 of 24 CenRF 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 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 anten
10. ell 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 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 wh
11. he 5 Shot bit M3 Gail 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 11 of 24 CenRF Output power The signal strength from the outdoor antenna directly affects the efficiency of the indoor coverage It is very important to choose 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 Ato E and select a best place that displays full bar signals to install the donor antenna WR 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 serve
12. ip antenna suitable to installed in the center and radiate all directions Page 16 of 24 CenRF 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 CEW P10 CEW P20 shall be installed in indoor areas only 1 2 3 4 5 Drill four holes as per the bracket size on the location where the repeater shall be installed and input expanding plastic Fasten the bracket vertically onto the wall by the screws Hang the repeater onto the bracket The other bracket is installed onto the back side of the repeater Connect the power supply and the cables properly to the repeater ports Check again to make sure the repeater is installed firmly and repeater alarm LED is green CenRF 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 pee cable iin Siz lt HARRAR Win lt lt Donor ant Indoor port gp Outdoor port gt Whip ant Power Adaptor 8 4 3 Acce 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 fro
13. link attenuation DIP switch uplink attenuation setting naB on ON or on or azas or on ON of ON baal ot ott ON ON or fesas ON ON Ton of fon dB B ON off ON ON off feaas off off off ON ON F346 ON ON off of aka of ON ON ON or fesas ON of of ON ON za off off ON off off fisas ON ON ON ON off Bea of ON of ON ON Sal ON off on off off frea off off off off ON bas ON ON of ON ON 6 8 of ON ON off off 1748 ON or al ao off off ON ON ON 7B ON TON ON off off fisas off ON off off ON feae ON off ON ON ON 86 of of of OW of fia onf on of or Ton fsa of oN T on ON ON B ON off of ON atb off off ON off ON fstas ON ON ON ON ON ro On off On of preon of onforfon ebe on ON or ON ae or ON ON or ON ol off off ON ON off Fal ON ON ON off ON oa ON of ON ON off fael off off off ON ON up off ON ON ON off eg ON off off ON ON aleng on on ON oN off fasas of ON of ON ON EE d off off off off ON pas ON ON off ON ON SaB of ON ON off of firal ON of of of ON peas of off ON ON ON 7dB ON ON ON off off fred off ON off off ON ba ON off ON TON ON 538 of of of ON of fioa on On of of On foal of on ON on ON 308 oN of of oN of os of of On of On
14. m feeder line antenna and splitter to combiners etc For example the repeater s frequency is WCDMA so all the accessories must support the WCDMA 1920 21 70MHz 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 LED s Status and definition of POWER indicators Page 18 of 24 CenRF Ce rr a Noma DC power problem Status and Definition of ALARM indicators It is working in linearity attention attention Input signals maybe notenough signals may attention Input signals maybe notenough not enough There are overloading or self oscillation strong input signals measures shall be taken Slight stronger input signals or slight self oscillation have accured o Repeater break down or deep self oscillation leads to auto mute Remark For WCDMA system only Alarm High LED works Please note that Alarm LED works on repeater downlink signals only I E the repeater input signals from NODE B Page 19 of 24 CenRF 8 5 2 Manual Gain Control MGC HELI J Uplink attenuation Down
15. na 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 24 of 24
16. necesenecccseseeeeeessnscessees 11 8 5 INDOOR ANTENNA INSTALLATION egen tegegeeb siondusdeennddsbeunentegsevesebbsdaciwndeninaddahbamesedienbiienbtayenidsbeaneuhbceteeedes ee egen 16 0 FRR ATER ING ALEAT ON eben 17 gal JEANIN ODS ene me nee oP ne een eee eee 17 GAZ Repeaters DONS COSCHOU ON E 18 8 4 3 Accessories SCIOCCION ssiccavscrcnsstnasixicesinsnceneacncbieseceiyvendendvtes desthccveesinestuevixiessonseeeneseveeneesesaetasseeessiiotdeeaseenesents 18 UI eege 18 E m ee e e ele EE 18 g2 Manual Gan Conto Ee 20 8 5 3 Repeater COMMISSIONING a eisrssirisiriiereisirriorasnneirintri dk iani DA A r ON ENNE ERRAN e aan Raan iais 21 OO O EMT E E 22 8 6 1 Check whether the coverage iS OOoO 22 8 6 2 Repeater can not communicate in Power ON StatuS ccccccssseseeeececenennessseeeeeesaaaeeseeesessaaaansseesessssaaaansaenees 23 Page 2 of 24 CenRF Preface This user s manual describes the installation commissioning and maintainance of CEW P10 CEW P20 repeaters Please do read the user manual carefully before installing and maintaining CEW P10 CEW 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
17. ng mobile phone to test the input signal strength at the repeater s NODE B port in order to get the exact values of PNope B PORT P CPICH B The gain to meet the targeted output power Page 21 of 24 CenRF Set G2 Pp max PNobe B PORT Pilot cH 70B 7dB explanation pilot signal of WCDMA system only takes up 10 of the NODE B total output power and shall be set at 50 capacity then the gain shall be set according to the input power level of Pilot CH in order to avoid breathing effect therefore there will be 5dB left from the total output power to leave the capacity to traffic channels C The Downlink maximum gain Gr SMIN G2 Gnroise 8dB Ligo 10dB usually the value shall be the equal value but if the coverage size is not big please reduce the gain to some degree Gnoise 8dB explanation The downlink gain can be maximum 8dB higher than uplink gain in indoor repeater solutions D The attenuation should be less than 30 dB when you set the downlink gain of the repeater and it would be the best to attenuate less than 15dB range and in case more than 15dB attenuation is needed please use external attenuator Uplink gain setting UL maximum gain Guy 5 MIN Got Gnroiser Ligso 10dB With the condition of meeting above formula Gu value is usually between Go and Gp 4dB 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
18. ol 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 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 CEW P10 CEW 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 8D FB cable to a CEW P10 CEW 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 Cell Tower ij Page 5 of 24 CenRF
19. r 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 installation please adjust the direction of donor antenna or change its installation position in order to obtain the best calling effect WR 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 itis a must that the waterproof shall be done to connectors of donor antenna and feeder lines Page 12 of 24 CenRF In order to avoid interference please note that the donor antenna should be far away from the following objects lt Metal lt 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
20. ro 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 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 8 of 24 CenRF 7 CEW P10 CEW P20 Main technical specification 7 1 Mechanical specification Weight 1 2kg Environment Conditions IP54 Cooling mode Nature cooling 7 2 Environment Conditions Operating Temperature 25 C to 55 C Storage Temperature 40 C to 80 C Humidity 5 to 85 7 3 RF technical specification CEW P10 P10 UL 10dBm DL 10dBm Page 9 of 24 CenRF f offset Maximum Gain 2 Alarm standard Power LED DC ON OFF LED indication DL ALC 1 SdB orange Alarm LED DL ALC 15 20dB re
21. s to make sure Ec lo is more than 6 dB dB 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 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 Keep horizontal cables straight and fasten them stably with a fixing clip every 1 to 1 5 meters with a proper stress 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 Separate RF cables from power cables Take proper isolation measures if they have to be placed on the Page 15 of 24 CenRF same cable racks owing to the site condition restriction 6 Correctly fasten all connection parts of the whole system from the antenna to active interfaces to passive interfaces and keep electrical interfaces w
22. 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 power is enough please install more server antennas or change with a repeater with higher power level 2 Ifthe 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 Page 22 of 24 CenRF Check whether 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 Check call quality 2 a the number of service 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 8 6 2 Rep
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