HUAC F10F-CP Cellular signal booster User Manual
SHENZHEN HUAPTEC CO., LTD Cellular signal booster
HUAC >
User manual
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| Document ID | 1771340 |
| Application ID | X7uPrLq44Ch26WLRWscNrQ== |
| Document Description | User manual |
| Short Term Confidential | No |
| Permanent Confidential | No |
| Supercede | No |
| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 35.97kB (449622 bits) |
| Date Submitted | 2012-08-21 00:00:00 |
| Date Available | 2012-08-21 00:00:00 |
| Creation Date | 2012-08-06 11:00:47 |
| Producing Software | Acrobat Distiller 8.1.0 (Windows) |
| Document Lastmod | 2012-08-06 11:00:47 |
| Document Title | untitled |
F10F-CP Cellular Signal Booster User’s Manual PREFACE ...............................................................................................................................................................................3 1. SAFETY WARNINGS .........................................................................................................................................................3 2. WHY BOOSTER ..................................................................................................................................................................4 2.1. REASON.........................................................................................................................................................................4 2.2. SOLUTION ......................................................................................................................................................................4 3. INTRODUCTION.................................................................................................................................................................6 4. SYSTEM CHARACTERISTICS..........................................................................................................................................7 4.1. FEATURES......................................................................................................................................................................7 4.2. APPEARANCE OF THE BOOSTERS ...................................................................................................................................7 5. BLOCK DIAGRAM AND WORK PRINCIPLE....................................................................................................................8 6. THE BOOSTER SYSTEM.................................................................................................................................................9 7. F10F-CP MAIN TECHNICAL SPECIFICATION...............................................................................................................10 7.1. RF TECHNICAL SPECIFICATION.......................................................................................................................................10 7.2. MECHANICAL SPECIFICATION .........................................................................................................................................10 7.3. ENVIRONMENT CONDITIONS ..........................................................................................................................................10 8. INSTALLATION ................................................................................................................................................................ 11 8.1. INSTALLATION LOCATION REQUIREMENT ........................................................................................................................ 11 8.2. POWER REQUIREMENT .................................................................................................................................................. 11 8.3. INSTALLATION TOOLS AND ACCESSORY ........................................................................................................................... 11 8.4. INSTALLATION OF DONOR ANTENNA ................................................................................................................................12 8.5. CABLE LAYOUT AND CONNECTOR ASSEMBLY ...................................................................................................................15 8.6. INDOOR ANTENNA INSTALLATION ....................................................................................................................................15 9. BOOSTER INSTALLATION............................................................................................................................................16 9.1. INSTALLATION REQUIREMENT .........................................................................................................................................16 9.1.1. Installation Location Requirement..................................................................................................................16 9.1.2. Power requirement.........................................................................................................................................16 9.2. INSTALLATION STEPS ....................................................................................................................................................16 9.2.1. Installation schemes.......................................................................................................................................16 9.2.2. B ooster’s ports 9.2.3. Accessories selection.....................................................................................................................................17 9.3. description................................................................................................... .......................17 BOOSTERSETTINGS....................................................................................................................................................17 9.3.1. Switch on power.............................................................................................................................................17 9.3.2. Manual Gain Control (MGC) ..........................................................................................................................19 9.3.3. B ooster Commissioning...............................................................................................................................19 9.4. SYSTEM TEST ..............................................................................................................................................................20 9.4.1. Check whether the coverage is good.............................................................................................................20 9.4.2. B ooster can not communicate in Power-ON status.....................................................................................22 -2- Preface This user’s manual describes the installation, commissioning and maintenance of wide band consumer boosters. Please do read user manual carefully before installing and maintaining the repeaters. The information in this manual is subject to change without prior notice. 1. Safety Warnings Users must follow the below principles： Booster should follow system requirement of communication equipment, assure good grounding and lightning protection. The power supply voltage of booster should m eet 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 and you may even get an electric shock. Do not open the repeater, touch the module of booster, or 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 booster will dissipate heat during working. And do not cover booster with anything that influences heat-dissipation. -3- 2. Why booster 2.1. Reason 1) Blind or weak signal areas are formed if the buildings are too far away from CELL TOWER, or the buildings themselves shield or absorb 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 call drops accordingly. 3) Elevators and basements are well-known for blind areas. 4) Downtown areas of the cities, which congested with many high-rise buildings, are usually the weak or blind areas. 5) The remote villages, mountains, hills, valleys, etc. are mostly populated areas with quite few mobile users, so the main target is to send coverage to these areas, and it will not be worthy installing a CELL TOWER, therefore a booster is a quite good option. 2.2. Solution 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 signal 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 that be frustrating 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? Then how to solve the problems? Best Solution: Plug & play: Purchase a set of repeater solution from us and install it, and immediately you would be able to enjoy the full bar and high quality signals! -4- 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 the human bodies badly, 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 10dBm~30dBm is 1.0W, and it decreases to be maximum 0.05W when reaching server antenna. And since the server antenna is installed over the ceiling or onto the wall, there is usually more than 3 meter away from the human body, 3meter away means at least 40dB propagation loss, or 10000 times less, 0.000005W, and 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 the RF radiation of the mobile phone tremendously. -5- 3. Introduction Our F10F-CP booster 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 possibly. One repeater covers 50 to 100 square meters. This booster 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, which will help to get the best coverage effect without any interference back to mobile network. And in order to maintain safe and specific output signal levels, this repeater has 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 indicating its environmental status: the Alarm LED’s located on the front of the unit 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. Our boosters also feature a Network Safe / MUTE feature that automatically shuts off the repeater to protect the cellular network if no adjustments are made to eliminate alarm readings on the repeater’s LED’s. You will want to make sure the LED’s remain green at all times for optimum system performance. (This function is not available for some specific models for which we will specify when you purchase) -6- 4. System Characteristics 4.1. Features z Very cost effective solution for immediate coverage z Dual System to amplify CDMA and PCS systems z Support any cellular devices (voice & data & video) z SOHO solution for small sized areas z Power LED for power status z Universal power range of 100V~264V z Palm size elegant design and low power consumption z Manual gain control provides a variety of applications. z Auto automatic gain control to stabilize the coverage and minimize the noises. z Auto shut off function as final step to avoid severe interference with mobile network (not available for some models). 4.2. Appearance of the boosters -7- 5. Block diagram and work principle F10F-CP is basically a bi-directional booster, the downlink signals are received by the repeater from BTS by the donor antenna, filtered by its combiner, 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 wide band frequency. The uplink signal of mobile terminal from the coverage area is input via the server antenna, then filtered by combiner, 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: z Combiner：The main purpose of combiner is to combine two systems to share the same antennas. z 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. z 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. z RF SAW: Filter out useless frequency and amplifier the useful frequency. z PA: The power amplifier sub system helps the repeater to reach its targeted output power, linearity of which decides the linearity of the repeater. z Power supply is to supply power electricity to all repeaters’ modules. -8- 6. The booster system Below diagram shows how simple and fast the booster system is installed and works effectively One Yagi antenna, as donor antenna, is installed at the top of the roof to pick up good mobile signals from the cell tower, and send through cable to the booster to amplify the signals significantly, and then the output signals are transmitted into area by the indoor antenna. Very clear phone call or high speed mobile data are immediately achieved within the area. z Donor Antenna： ¾ Outdoor panel or wide band Yagi is recommended. ¾ Function: Pick up outside signals from the cell tower and send to the repeater by cable; donor antenna also transmits the uplink signals from the booster to cell tower. z Server Antenna: ¾ Indoor Omni ceiling or indoor panel is recommended, whip antenna is also ok for 10dBm booster, however the coverage size will be limited. z Cables: LMR 300 or 400, 3D, 5D or 8D - FB coax cables are recommended. z 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. -9- 7. F10F-CP Main technical specification 7.1. RF technical specification Electrical specification Frequency Range Uplink Downlink CDMA/ GSM850 824 ~ 849 MHz 869 ~ 894 MHz CDMA1900/PCS/ 1850 ~ 1900 1910 MHz 1930 ~ 1990 MHz ≧55dB ≧60dB ≧10dBm ≧10dBm Max. Gain Max. Output power Band width (-3dB) Wide Band MGC (Step Attenuation) ≧15dB / 5dB step Automatic Level Control ≧15dB auto shut off after 15dB (Optional) Spurious Emission 9KHz~1GHz ≦-36dBm @ 3KHz 1GHz~12.75GHz ≦-30dBm @ 3KHz Noise Figure ≦6dB VSWR ≦2.0 Group Delay ≦1.5μs LED Alarm Standard LED 1 LED Alarm Power Indicator (ALC 1~5dB,Grange;ALC 14~16dB,Red, then LED 2 shut off 31dB gain) 7.2. Mechanical specification SN Item specification Environment Conditions IP40 Cooling mode Nature cooling 7.3. Environment Conditions SN Item specification Operating Temperature -25°C to +55°C Storage Temperature -40°C to +80°C Humidity 5% to 85% - 10 - 8. Installation F10F-CP boosters should be used to cover the indoor area. Humidity and temperature of working environment can affect the reliability of booster. So, temperature, humidity, dust , interference, power, space requirements and other factors should be considered during installation of booster. 8.1. Installation Location Requirement 1) It is appreciated that the booster is installed in a cool, dry and ventilated room without erosive gas and smoke and without leakage on its proof. 2) Or a cool and ventilated wall of which sun-proof and waterproof is expected. 3) Besides above, common wall, tower or high pole is Ok too. 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 conductor 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 90~264VAC / 50±5Hz 8.3. Installation tools and accessory No. Name Specification Quantity Plastic Expansion Bolt M5*24 Standard accessories Tapping screw M3*27 Standard accessories Hanging folder Standard accessories reciprocating drill Engineering-owned, punch the wall Shot bit Engineering-owned, punch the wall M3 - 11 - Remark 8.4. Installation of donor antenna The boostter’s main function is to improve weak RF signals of an area. A simple formula: Input power+ Gain= Output power. The signal strength from the outdoor antenna directly affects the efficiency of the indoor coverage. It is very important to choose the donor antenna location in order to get the best signals. Testing the signal strength received from donor antenna mounted in site by mobile phone: z Please select the top of building to install the donor antenna if total floors are less than 7 floors, and shall try your best to select places like balcony or platform lower than 7th floor for donor antenna if the buildings are over 7 floors, because the mobile signals are clean at less than 7th floor. z The mobile phone shall display full bar signals in location where the donor antenna is installed z The phone calls or data transmission shall be smooth and stable by 3 times testing in location where the donor antenna is to be installed z 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. Selecting the installation direction of donor antenna. z The donor antenna shall point to the direction of the tower, and it would be much better to keep line of sight. z 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. z If the performance is poor due to weak signals or poor phone call quality, please adjust the direction of donor antenna or change its position in order to obtain the best calling effect. z The wide band booster supports all mobile operators or different mobile systems, so please - 12 - adjust the donor antenna direction to have balance between signals of different mobile operators or various mobile systems. Donor antenna installation ---Notes: z Do not install the donor antenna during the rainy day with lightning. z Please follow the instructions to install the donor antenna. z It is a must that the waterproof shall be done to connectors of donor antenna and feeder lines. z In order to avoid interference, please note that the donor antenna should be far away from the following objects of metal, high-voltage line, RF antenna and high-voltage transformer. z 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 only run smoothly if alarm LED always remains GREEN color. The minimum distance between donor antenna and server antenna shall be more than 10 meters; again the direction of donor and server antennas shall be opposite. As shown in the below illustration, the booster amplifies the downlink signal r from the tower and send to the indoor antenna hereafter. If the distance between outdoor antenna and indoor antenna is less than the required distance, the amplified signal will go back from indoor antenna to outdoor antenna. So it will lead to self-oscillation and reduce the coverage area, also the bad calling quality could happen at the same time, and the worse is that the mobile network could be influenced badly and the operators will finally come to shut off the repeater system. If isolation can’t be achieved by the limited distance, the roof of the building or any other barriers can be used in between to increase isolation. - 13 - Installation of panel antenna as donor antenna Installation of wide directional antenna as donor antenna Installation of YAGI antenna as donor antenna - 14 - 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) 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 condition restriction. 3) 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. 4) 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. 8.6. Indoor antenna installation Proper antennas shall be selected according to the site conditions and the requirement. 1) Omni antenna (ceiling Omni or whip antenna) is suitable to be installed in center and radiate all directions. 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). - 15 - 9. Booster Installation 9.1. Installation requirement 9.1.1. Installation Location Requirement 1) The booster shall be installed indoor in a cool, dry and ventilated room without erosive gas or smoke, or a cool and ventilated wall to ensure excellent heat dissipation 2) Installation height should be easy for RF cable wiring, heat dissipation, security and maintenance. 3) Have a set of independent and stable power supply. 9.1.2. Power requirement Generally it is AC power supply, and the requirement of AC is 100~264VAC / 50±5Hz 9.2. Installation Steps 9.2.1. Installation schemes The booster shall be installed in indoor areas only 1) Connect the power supply and the cables properly to the booster ports 2) Check again to make sure the repeater is installed firmly and booster alarm LED must stay green. - 16 - 9.2.2. Booster’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. 9.2.3. 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 50ohm. To use any other impedance of coax will put an extra load on your repeater, shorten its life span and decrease the system performance. 9.3. Booster Settings Please check very carefully all cable connections are correct and firm before running operation test and then carry out following tests. 9.3.1. Switch on power After power is on, check firstly the alarm and power LEDs. Status and definition of POWER indicators: - 17 - z Status Definition Green Normal Off DC power problem Status and Definition of ALARM indicators; Alarm LED only works for downlink signals Status ALARM It is working in linearity Green Warning: Input signals may be not enough, so please check on coverage effect, do not do anything if it is good; otherwise please adjust the repeater system to get better coverage. A little bit stronger input signals or slight self oscillation have occurred. Solution: Please adjust antennas or use MGC to reduce the repeater gain, till Orange you find “edge point” with green LED (I.E. the Alarm LED must stay at green color, and at the edge of turning Orange), and let the repeater work at this point. MGC is the last measure to take as it will influence on coverage. There are strong input signals or severe self oscillation, measures must be Red taken (please note that our repeaters have auto shut off function, so the red color status can only maintain 5 seconds). Repeater breaks down, or severe self oscillation leads to auto mute. Please Off re-plug in and check if alarm LED turns red, if it is, please take measures to keep alarm LED green; if it maintains off, it means the power break down. Remark: Please note that Alarm LED works on repeater downlink signals only. I.E. the repeater input signals from CELL TOWER. Single system booster only has one set of power and alarm LEDs, while dual system have two sets of power and alarm LEDs, and three system repeaters have three sets of LEDs. Each system has own relevant LED and please refer to the correct LED for system performance evaluation. Then booster with plastic closet is designed with LEDs of “Alarm LOW” and “Alarm HIGH”. When it is used for single system of CDMA800, GSM850 and GSM900, only “Alarm Low” LED works, and “Alarm HIGH” LED is no use; when it is used for single system of DCS, PCS, CDMA1900, WCDMA or AWS, “Alarm HIGH” LED works, and “Alarm LOW” LED is no use. When the booster supports two systems, “Alarm Low” and “Alarm HIGH” both work and support relevant low and high frequencie - 18 - 9.3.2. Manual Gain Control (MGC) DIP Switch can be used to adjust the booster gain when Alarm LED is orange or even RED. The principle is that booster alarm LED must be green color. Switches 1.2 represent Downlink and 3.4 represent Uplink. When it is necessary to adjust the gain by DIP switch, firstly please adjust Downlink gain according to input signals, secondly please adjust Uplink gain according to Downlink gain. The DIP Switches have default ‘OFF’ status; please push relevant switches to “ON” position if certain attenuation value needs to be achieved. DIP switch downlink attenuation setting: Att 0 dB 5 dB 10 dB 15dB off ON off ON off off ON ON DIP switch uplink attenuation setting: Att 0 dB 5 dB 10 dB 15dB off ON off ON off off ON ON 9.3.3. Booster Commissioning 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. Alarm LED color must remain green. As for the downlink working performance, it is a good working point that Alarm LED maintains “Green” color with the intention of turning orange; 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 overloading status of “red” (the equipment would hold higher interference and depression ability at this stage). So we shall try our best to set the equipment near “edge point” of green and intention of turning orange during engineering. Setting of “edge point”: Switch on the power supply after connection with donor antenna and server antenna, and observe - 19 - ALARM LED. 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. If it shines “green” then, Please check coverage effect firstly, if the coverage effect is good, the engineering has reached expecting target, thus there is no need to do anything. 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 has not been set, it indicates that the input power is not strong enough to let the repeater reach its good coverage. If the coverage effect is not good, the donor antenna should be adjusted to get stronger input signal. It is recommended that one person shall check the coverage effect inside the building when the other person is trying to adjust the antenna or the repeater. At this stage, please make sure “Orange” color will not be generated by self oscillation. Please take off the server antenna to check if it is self oscillation or not: if the Orange turns to be green, it is self oscillation; if it stays as Orange, it is not self oscillation. Please follow steps in other page to turn Orange to be Green. Uplink gain setting Standard: uplink attenuation values =downlink attenuation values Remark: Avoid putting more than a 5dB difference between the Uplink and Downlink. And Uplink gain must be equal to or less than Downlink gain, it can’t be more in order to avoid interference with mobile network. 9.4. System Test 9.4.1. Check whether the coverage is good 1) Have a test 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 antenna to increase input signal power level. - 20 - Check whether it is necessary to add more server antennas since barriers block the signal penetration, also check whether the repeater’s power is enough; please install more server antennas or replace with a repeater of 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 antenna location to improve coverage. Check if it is necessary to adjust the direction of the sever antenna. Check whether it is necessary to add one or more antenna to enhance the coverage of special areas. Test Check the signal No Strength if fit Yes Check call quality No 1) Move service antenna 2) Increase the number of service antennas 3) Reduce the attenuation values 4) Increase the output 1) Move service antenna 2) Increase the number of service antenna 3) Reduce the attenuation values 4) Increase the output power Yes Completion Remark: Reduce the attenuation values*---at the same time must ensure the isolation Increase the output power* ---recommended ways: adjust the donor antenna direction / location, or replace with higher gain antenna to increase input signal strength. - 21 - 9.4.2. Booster can not comm unicate in Power-ON status 1) The power is on but it has a signal fluctuation or a flash signal. The phone call can not be achieved. It shall be caused by the insufficient isolation between donor antenna and serve antenna. Please take below measures: ¾ Firstly check whether the alarm LED is orange. The orange light shows the insufficient isolation. ¾ Secondly adjust the antennas’ directions or locations or enlarge the distance between them. ¾ Thirdly reduce the repeater’s gain by ATT DIP if the above methods don’t work. The following measures can also be tried: ¾ Use the roof of the building to enlarge the isolation (Please try to place the donor antenna and server antenna in different floors). ¾ Use some obstacles (Such as wall). 2) The booster’s power is on but the phone is not connected into the network and still can not communicate. ¾ Reason 1: There are loose or wrong connections in the repeater system. Solution: Please try to fasten the connections between the different parts of the system. ¾ 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.) Solution 1: Change the direction of donor antenna or its installation position, so that the gap of signal strength is reduced between operators. Solution 2: Use barriers (like buildings) to block signals of other operators. IC STATEMENT Operation is subject to the following two conditions: (1) This device may not cause interference, and (2) This device must accept any interference, including interference that may cause undesired operation of the device. Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement. - 22 - FCC Statement 1. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference. (2) This device must accept any interference received, including interference that may cause undesired operation. 2. Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. FCC Radiation Exposure Statement This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 400cm between the radiator & your body. -----------------------------------------------------------------------End ---------------------------------------------------------------------------- - 23 -
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