Westell CSI310-03 Bidirectional amplifier User Manual March 2000

Westell, Inc. Bidirectional amplifier March 2000

Contents

User Manual March 2000

Model 310Model 310Model 310Model 310Plus In-Building Amplifier In-Building Amplifier In-Building Amplifier In-Building AmplifierInstallation and Users ManualCellular Specialties, Inc.
DISCLAIMERAll information and statements contained herein are accurate to the best of the knowledge of Cellular Specialties, but Cellular Specialties makes no warrantywith respect thereto, including without limitation any results which may be obtained from the products described herein or the infringement by such products ofany proprietary rights of any persons. Use or application of such information or statements is at the user's sole risk, without any liability on the part of CellularSpecialties, Inc. Nothing herein shall be construed as license or of recommendation for use, which infringes upon any proprietary rights of any person.Product material and specifications are subject to change without notice. All sales of the product or products described herein are subject to CellularSpecialties' standard terms of sale and the specific terms of any particular sale.The serial number may be found on the label on the rear panel of the unit. For yourconvenience, note this number below, and retain this manual, along with proof of purchase , toserve as a permanent record of your purchase in the event of a theft, or for future reference.MODEL NUMBERNAME OF COMPANYDATE OF PURCHASE310SERIAL NUMBER FCC ID NVRCSI310-03 This device complies with part 90 and part 2 of the FCC Rules. Operation is subject to the following conditions: (1) This device may not cause harmful interference, and this device must accept any interference that may cause undesired operation.
MANUAL110+ REV B 2TABLE OF CONTENTS1.0 SAFETY GUIDELINES 32.0 PRODUCT DESCRIPTION 4MECHANICAL OUTLINE DRAWING 53.0 GENERAL SPECIFICATIONS 64.0 INSTALLATION 75.0 AMPLIFIER ADJUSTMENT 96.0 TROUBLESHOOTING 10
MANUAL110+ REV B 3SAFETY GUIDELINES! GROUNDINGThis amplifier system is designed to operate from single-phase 120VAC power and shouldalways be operated with both the neutral and ground wires properly connected. Do notremove or otherwise alter the grounding lug on the power cord.! EXPLOSIVE ATMOSPHERESThis product has an integral circuit breaker, which may cause an electrical flash if thebreaker should reset. To avoid explosion or fire, do not operate this product in the presence offlammable gases or fumes.! LIGHTNING DANGERDo not install or make adjustments to this unit during an electrical storm.! NO USER SERVICEABLE PARTS INSIDEHAZARDOUS VOLTAGES ARE PRESENT WHEN THE COVER IS REMOVED.Opening the chassis will void your warranty. If you suspect a malfunction with this product, callyour dealer or the Cellular Specialties Support Line at (603) 626-6677.!!!!The general safety information in this guideline applies to both operatingand service personnel. Specific warnings and cautions will be found inother parts of this manual where they apply, but may not appear in thissummary. Failure to comply with these precautions or specific warningselsewhere in the manual violates safety standards of design,manufacture, and intended use of equipment. Cellular Specialties, Inc.assumes no liability for the customer's failure to comply with theserequirements.1.0
MANUAL110+ REV B 4PRODUCT DESCRIPTIONCellular Specialties, Inc. developed the Model 310Plus In-Building Amplifier (IBA) for use in enclosedstructures where sufficient signal from local cell sites to operate cell phones was unavailable within thebuilding. It is, of course, necessary that sufficient signal be available on the roof of the structure. TheIBA is connected to an external antenna, usually on the roof, and to one or more internal antennasplaced strategically throughout the area where phone service is desired.The external antenna is usually a directional type such as a "yagi" however an omni-directional antennamay be used when the building is located in close proximity to one or more cell sites. Internal antennasare usually omni-directional although various other types may be used for certain installations. The IBAamplifies both the "uplink" (phone to tower) and "downlink" (tower to phone) signals thus facilitatingcommunications to and from the local cell siteThere are four amplification stages on the downlink and four on the uplink for a total of +57dB nominalgain for each link. (see Figure 2.1) Both links have manual gain control settings accessed through DIPswitches on the back panel plus an AGC control for both the uplink and downlink. There are LEDindicators on the front panel for power on, transmitter on, uplink overload and downlink overload.An automatic amplifier safety shutdown circuit is also present which will disable the transmitters for tenseconds should the uplink and downlink overloads be reached simultaneously to prevent excessiveintermodulation and oscillation.FIGURE 2.1 Functional Block Diagram2.0
MANUAL110+ REV B 52.6753.0011.87511.50I08.50.75TYPE-N CONNECTOR(2 - PLACES)MOUNTING HOLE(6 - PLACES)POWER CORD(6 FOOT)DOWNLINK ATTENUATORAND AGC SWITCHESPOWER ONSWITCHDOWNLINK OVERLOADINDICATORUPLINK OVERLOADINDICATORPOWERINDICATORTRANSMITTER ONINDICATORALL DIMENSIONSARE IN INCHESSCALE: 1/2 TO 1FIGURE 2.2 Model 310 Mechanical Outline DrawingUPLINK ATTENUATORAND AGC SWITCHESFCC IDLABEL10.25
MANUAL110+ REV B 6GENERAL SPECIFICATIONSAll specifications stated as typical unless otherwise noted. Cellular Specialties, Inc. reserves the right to change these specifications at any time without notice.3.0 Uplink (Phone to Tower) Downlink (Tower to Phone) Frequency 806-821MHz 851-866MHz Pass Band Ripple ±1.5dB ±1.5dB Gain @ Zero Attenuation +57dB+3dB +57dB+3dB Gain Adjustment Range -28dB -28dB Power Output, (max). 1dB Compression +27 dBm +27 dBm *Linear +22 dBm +22 dBm Noise Figure, Typ. +6dB +6dB 3rd Order Intercept Point, IP3 +43dBm +43dBm **Maximum Input Power -10dBm -10dBm VSWR 2.0:1 Max Propagation Delay <1.0 microsecond Impedance 50 Ohms Connectors ‘N’ Female Power Requirements 120 VAC @ 500mA Size 12” x 10” x 3” Weight 6¾ Lbs., 3 kg Operating Temperature -22 to +118°F, -30 to +48°C Indicator LEDs Power, Transmitter On, Uplink Overload, Downlink Overload Controls Power switch with circuit breaker, AGC override switch, switches for Uplink and Downlink attenuation from 0-28dB in four dB steps. NOTES; * Maximum total output power without exceeding the FCC allowable spurious emissions of –13 dBm. ** Maximum safe input power at maximum gain with no damage
MANUAL110+ REV B 7INSTALLATIONPre-installation SurveyNote:The Installer should refer to the Safety Precautions, in thefollowing section, for proper antenna selection and installationA pre-installation survey should be performed prior to commitment to installation. Measurement ofReceived Signal Strength Indication (RSSI) should be recorded throughout the building in all areaswhere cell phone coverage is desired. RSSI levels around the exterior of the building as well as on therooftop or as close to the point where the exterior antenna will be installed should also be recorded.RSSI readings at the position where the outside antenna will be installed should be greater than –90dBm. (E.g. –85dBm) Successful installations may be made with lower readings in some cases.The exact location of the proposed outside antenna should be measured with a GPSunit and the coordinates of the cell sites closest to the building in which the system isbeing installed should be obtained. With these coordinates the distance and bearingto each of the local cell sites can be computed and made available to the installationteam. The first choice should be the closest site unless there is blockage in the formof buildings or terrain between the building and this cell site. If blockage exists analternate site may be available.If GPS coordinates are not available there is an alternative method of locating thedominant site: connect a handset via SMA female to N male adapter to thedirectional donor antenna. Rotate the antenna until maximum RSSI and SQEreadings are obtained and secure it.The location of the IBA and the interior antennas should be determined through theuse of floor plans of the building in which the system is to be installed. It is importantto locate the IBA at a central location and try to keep the coax runs from the amplifierto the antennas as short as possible. A maximum length of 150 feet is suggestedalthough longer runs might be accommodated. This assumes that a coax with loss at4.0!!!!WARNING!AMPLIFIER DAMAGE WILL OCCUR IF A HANDSET ISCONNECTED DIRECTLY TO THE IBA OR THE COAX THATLEADS TO THE IBA.
MANUAL110+ REV B 8800 MHz of approximately 3.5 dB per 100 feet is used. The coax used should be anominal RG-8 type with a flame retardant rating except when installed in spacewhere moving air (heating and/or cooling) exists. In which case the coax must be“plenum” rated. For long runs that exceed 150 feet, the use of low loss ½” coax isdesirable. Of primary concern is the isolation between the outside antenna and theinside antennas.Important note: A high degree of isolation must be afforded in order to preventany re-generative feedback in the system. Feedback of this nature causes theamplifier to emit a continuous signal of maximum amplitude and could, insome cases, interfere with normal operation of the cell site. This isolationshould be in the order of 70 dB and is usually obtained by mounting theoutside antenna away from the edges of the roof. The use of window mountsor other non-rooftop mountings should be avoided.SAFETY PRECAUTIONSFor INDOOR use, an Omni-Directional Antenna with a maximum gain of 3dBi isauthorized for use with this unit.Inside antennas must be positioned to observe minimum separation of 20 cm.(~ 8 in.) from all users and bystanders. For the protection of personnel workingin the vicinity of inside (downlink) antennas, the following guidelines forminimum distances between the human body and the antenna must beobserved.The installation of an INDOOR antenna must be such that, under normalconditions, all personnel cannot come within 20 cm. (~ 8.0 in.) from anyinside antenna. Exceeding this minimum separation will ensure that theemployee or bystander does not receive RF-exposure beyond theMaximum Permissible Exposure according to section 1.1310 i.e. limits forGeneral Population/Uncontrolled Exposure.!!!!
MANUAL110+ REV B 9For OUTDOOR use, a Directional Antenna up to a maximum gain of 11dBd isauthorized for use with this unit.The Outside antenna must be positioned to observe minimum separation of120 cm. (~ 4 ft.) from all users and bystanders. For the protection of personnelworking in the vicinity of outside (uplink) antennas, the following guidelines forminimum distances between the human body and the antenna must beobserved.The installation of an OUTDOOR antenna must be such that, under normalconditions, all personnel cannot come within 120 cm. (~ 4 ft.) from theoutside antenna. In all installations, the antenna should never be mountedsuch that the main beam is directed toward an area where workers orbystanders may be present. Exceeding this minimum separation willensure that the worker or bystander does not receive RF-exposure beyondthe Maximum Permissible Exposure according to section 1.1310 i.e. limitsfor General Population/Uncontrolled Exposure.Physical InstallationThe coaxial cable discussed above should be pulled from the rooftop location to thespace designated for the amplifier installation. Additional coax should be pulled fromthe amplifier to where power splitters are located and thus to the position designatedfor the Omni-directional antennas. Usually this is accomplished by using existingcableways and running the cable above suspended ceilings. In many cases theOmni-directional antennas can be located above the suspended ceilings however,when this is not possible, alternatives such as ceiling or wall mounted antennas maybe used.When mounting the amplifier, take care to avoid areas of high heat or extreme cold.In general, do not place the unit on or near the top of high ceilings, by heaters or incold storage areas.!!!!
MANUAL110+ REV B 10AMPLIFER ADJUSTMENTIn most cases the IBA will need very little adjustment. After connecting the coax andpowering up the IBA, the signal levels within the previously surveyed areas should bechecked for adequate RSSI and Signal Quality Equivalent (SQE) levels.Measurements should be made at the perimeter of the building both inside andoutside. It is important that the RSSI levels measured outside the building remainclose to those measured prior to installation of the IBA.Both the uplink and downlink overload indicators should remain off. If either indicatoris illuminated, the gain of the appropriate link should be reduced.If the gain of the amplifier needs adjustment the uplink and the downlink may beadjusted by means of the step attenuators on the rear of the unit. Attenuation from 0dB to 28 dB in steps of 4 dB may be inserted by proper selection of the 4, 8 and 16dB attenuators. If satisfactory cell (or two-way) phone performance is not obtainedwhen the phone is in close proximity to the interior antenna it may be necessary todecrease the gain of one or both of the links.5.0
MANUAL110+ REV B 11TROUBLESHOOTINGAll external cables should be carefully checked for “shorts” and “opens”.The rooftop antenna, if directional, should be checked for proper alignment along thecalculated compass heading. Typically, the directional antenna should be aimed atthe same sight that your handset uses in the area where the outside antenna is to beplaced.If cables and alignment are O.K. it may be necessary to use a spectrum analyzer toexamine the signal environment in which the IBA is operating. The existence ofstrong analog signals within the frequency bands can cause problems particularly onthe downlink. In some cases additional filtering might be required to reject theseunwanted signals. Automatic Gain Control (AGC) may be switched on by moving theleftmost dip switch to the on (down) position. In some instances the directionaloutside antenna can be reoriented, horizontally to place the interfering source in anantenna pattern “null”. There also may be some cases where the interference fromoutside signals is so great that they can not be filtered or otherwise reduced oreliminated without expensive and possibly prohibitive measures. In these cases itmay not be practical to use the IBA for providing coverage at these sites.6.0

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