Bird Technologies Group 5PI618850 BI-DIRECTIONAL SIGNAL BOOSTER User Manual 61 88 50 V4 less block

Bird Technologies Group BI-DIRECTIONAL SIGNAL BOOSTER 61 88 50 V4 less block

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Manual 7-9375-4 Page 10TX RX Systems Inc. 10/29/04display which does require a button press to exit.The main status display shows the uplink anddownlink gain in dB as well as the uplink and down-link output level in dBm.The last line of the main status display gives asummary status message for the entire signalbooster. In this example “Status OK” is being dis-played. Pressing the “ENTER” button will move youfrom the main status display into the menu selec-tions and will permit interaction with the system.There are two main functions available within thesoftware menus including configuration settingsand detailed status displays.Configuration SettingsIn most cases, the factory default settings are theoptimum values for adjustable parameters. Themost common setting to be changed by the sys-tem’s technician is the gain setting. This is normallydone to compensate for varying values of antennaisolation as outlined earlier in this manual or toreduce excessive OLC action resulting from exces-sive gain.Please thoroughly study this section before makingany adjustments to the configuration values. Eachconfigured item is discussed in detail.RESTORE ORIG CONFIGThis command will restore all configured settings totheir original factory default values. SB II ships fromthe factory preset to the lowest gain possible.CALIBRATE CURRENTSUse this command when replacing an RF amplifier.This function automatically calibrates the currentalarm “trip” point of each amplifier in the system.Due to manufacturing tolerances there are smalldifferences in current draw between amplifierassemblies. This software function matches thealarm sensing circuit to the respective amplifierassembly and should be repeated whenever anamplifier assembly is replaced.SET GAINThis function allows the user to electronically setthe gain of the booster in 0.5 dB increments over arange of 30 dB. Gain can be adjusted indepen-dently for both the uplink and downlink channelsbut in most cases both uplink and downlink shouldbe set to the same gain value.Know your antenna isolation before making thisadjustment. We recommend that you temporarilydisconnect both the uplink and downlink antennaswhen setting the gain to avoid the possibility ofcausing the unit to oscillate. After changing the set-ting, power the unit down, reconnect the antennasand power-up the booster.Note: A reduction in system gain willalso result in an equal reduction in theOLC dynamic range, refer to the sec-tion titled “OLC” on page 11.SET OUTPUT LEVELAllows the output power for the uplink and downlinkchannels to be independently adjusted in.5 dBincrements up to +31 dBm. Note that the OLC cir-cuitry will maintain the systems output level at thevalues you have selected in this menu.Use this function ONLY if your system is causingsome form of interference to another radio system.You can only reduce the booster’s output powerwith this command.CHANGE GAIN CONFIGURATIONInsures proper gain readings when changing basicbooster gain by changing the type of plug-in cardassemblies.Use of this menu is ONLY needed when convertingyour stock SB II to a different gain level by chang-ing the low level, mid-level plug-in amplifier card orthe addition of an attenuator card. It actually is achange to the characteristics of another model.Don’t confuse this with simple amplifier bypassingto reduce gain. Uplink and down link can be setindependently. Choices for gain are Full, Mid orLow and the Enter key toggles the gain setting. Thecorresponding gain level is displayed. Select Doneusing the arrow keys and press enter to return tothe menu. Use the Cancel button to return to theStatus Display.Detailed Status ScreensThese items allow a detailed examination of sys-tem components including; all amplifiers (currentdraw and temperature), the power supply (voltagelevel), and the OLC function (present status andhistorical archive). Each item is discussed below indetail.NOTE61-88-50-UserMan Page 16 of 29
Manual 7-9375-4 Page 11TX RX Systems Inc. 10/29/04AMPLIFIERSA separate status screen is available for eachamplifier in the system. When an amplifier isselected this function will display the present cur-rent draw of that amp as well as its present operat-ing temperature in degrees Celsius. In addition, astatus message will indicate if the amplifier is con-nected and whether the amplifier is bypassed ornot bypassed. This menu selection also providesthe option of placing an amplifier in bypass or tak-ing an amplifier out of bypass.The current draw will be blank if an amplifier is notconnected, will display BYP if the amplifier isbypassed, and will display ATTEN if an attenuatorcard is being used in place of the amplifier card.The power amplifier currents will nor-mally fluctuate up to 850 ma when sig-nals are present.POWER SUPPLYThis function displays the real time power supplyvoltages for both 24 volt and 12 volt supplies.OLCThis screen shows the amount of attenuation pres-ently being used by the OLC for both the uplink anddownlink channels. In addition, the percentage ofOLC presently being used is also shown.The amount of OLC currently beingused in either the uplink or downlinkchannels is also indicated by LED bargraph displays located on the displaypanel. Each segment represents 2 to4 dB of attenuation depending on the gain settingof the booster. The OLC bars should only be activeoccasionally and no more than 3 or 4 segmentsbriefly lit. Constant light bar activity means thebooster gain needs to be reduced for optimum per-formance.The system has 60 dB of OLCdynamic range. However, thedynamic range of the OLC is reducedwhen the user selectable gain isreduced. The reduction will be anequal amount. For instance, if the user selectablegain is reduced by 20 dB then the OLC dynamicrange will also be reduced by 20 dB.OLC DATALOGThis screen displays an OLC Datalog which is theOLC data over the past 100 days for both uplinkand downlink branches of the system. This is a roll-ing 100 day log with day 101 overlapping day 1 andso forth. Day zero represents the current day whileday one represents yesterday and so on. Thelogged data is stored in non-volatile memory andwill not be erased when the unit is powered down.The average OLC attenuation used when the OLCwas active is given both for individual days andover the entire past 100 days. The percentage oftime the OLC was active is also given for both indi-vidual days and over the past 100 days. Thisarchived information will permit the creation of auser signal profile to facilitate optimum system con-figuration and performance.This archive feature will allow you to see if the gainof the unit is set too high or if there are transientepisodes of strong signals perhaps desensingother channels being amplified by the booster.AlarmsThe system continuously monitors the current drawand operating temperature of each amplifier as wellas the voltage level of the +12 and +24 VDC sup-plies. If any of these parameters exceed normaloperating levels by a factory preset percentage thesystem enters an alarm condition. Notification of analarm condition is provided by LED indicators andForm-C contacts available via the alarm terminalscrews.LED INDICATORSThere are LED indicators for each amplifier in thesystem as well as the +12 and +24 VDC powersupply voltages. The LED indicators for the low,mid, and low gain amplifiers are located on theindividual plug-in module. These are tri-color LED’swith green representing NORMAL operation,orange representing a WARNING condition, andred indicating a FAULT. A warning condition occurswhen the current draw of the amplifier exceedsnominal by +/- 20%. Fault conditions occur whenthe current draw exceeds +/- 30% or the amplifiersoperating temperature exceeds 80° Celsius. TheLED for the attenuator card is green only and indi-cates DC power applied to the card.NOTENOTENOTE61-88-50-UserMan Page 17 of 29
Manual 7-9375-4 Page 12TX RX Systems Inc. 10/29/04The LED indicators for the power amplifiers arelocated on the display panel next to the menuselect buttons and are dual color LED’s. Green rep-resents NORMAL operation while red indicates aFAULT condition. Fault conditions occur when thecurrent draw exceeds 900 ma or falls below 200ma. Also, whenever the amplifiers operating tem-perature exceeds 95° Celsius. The power amplifi-ers do not have a warning state.The power supply LED indicators are located ondisplay panel next to the menu selection buttonsand are also dual color. Green representing normaloperation and red a fault condition. A fault conditionfor the +24 VDC supply occurs whenever the volt-age potential drops below +16 VDC (30% belownominal). Likewise, a fault for the +12 VDC supplyoccurs when the potential is below +8 VDC (30%below nominal).FORM-C CONTACTSForm-C contacts are available inside the cabinetnext to the power supply assembly, see figure 2.These screw terminals are intended for connectionto the customers supervisory alarm or data acqui-sition system. One set of terminals supplies notifi-cation of any alarm condition occurring and thesecond set of contacts indicate the system is oper-ating on battery backup power. PERFORMANCE SURVEYIt is a good idea to document the performance ofthe system after installation so that a referenceexists for future comparisons. This information canmake troubleshooting an interference problem orinvestigation of a complaint about system perfor-mance much easier. If there are coverage prob-lems with a system, this survey will usually revealthem allowing corrective measures to be takenbefore the system is put into routine use. The fol-lowing is an outline of how to do such a survey.Because the nature of each installation can bequite different, only a broad outline is given.1) Measure the gain of the signal booster beingcareful not to exceed the maximum input level.Figure 8 shows this being done using a signalgenerator and spectrum analyzer. Record themeasured values for each passband. We rec-ommend that a 50 ohm load be connected tothe unused RF port on the bottom of the cabinetduring the gain test.SignalGeneratorZeroReferenceSpectrumAnalyzerGainSampleSampleTest PortTest PortFigure 8: Measuring signal booster gain.61-88-50-UserMan Page 18 of 29
Manual 7-9375-4 Page 13TX RX Systems Inc. 10/29/042) The spectrum analyzer is connected to the -30dB signal sampler port following the final outputamp. This port will allow the observation of theamplifier output at a considerably reduced out-put level. This decoupling value (-30 dB) needsto be added to any measured signal value inorder to arrive at the actual signal level.3) With a spectrum analyzer connected to the sig-nal sampler port (see Figure 9), have person-nel with handheld radios move to severalpredetermined points and key their radios.Record the level of these signals as observedon the analyzer and also record the location ofthe person transmitting. In this way, a map ofthe systems performance can be generated.4) For signals coming from a fixed antenna or sta-tion, record the level of all the desired incomingsignals for future reference.MAINTENANCE AND REPAIRSignal boosters manufactured by TX RX Systems,Inc. can perform for years with little maintenanceand repair. However, if the amplifiers are subjectedto excessively high signal levels, power surges orlightning strikes, failures may occur. The followingprocedures may be followed for detecting a mal-functioning unit or as part of a periodic mainte-nance program.1) The heatsink area should be cleared of dustand debris.2) Inspect the unit to see that the two power sup-ply LED DC indicators are lit (remove any dustor debris that may obscure the LEDs). This willverify that DC power is flowing properly. Checkall hardware for tightness.3) Compare system performance to initial perfor-mance levels measured when the system wasfirst installed. The lack of signal can be traced toa malfunctioning amplifier by progressive signalmonitoring from the output (far end) to the inputend of the system noting the area where theBoostedRF SignalSignal Distribution SystemSpectrumAnalyzer10 dB PadSampleSampleTest PortTest PortFigure 9: Methodology for doing a performance survey of the signal distribution system. 61-88-50-UserMan Page 19 of 29
Manual 7-9375-4 Page 14TX RX Systems Inc. 10/29/04signal returns to normal level. The next amplifiertoward the output end of the system will proba-bly be the one that failed.orMeasure the gain at any convenient frequencyin the working frequency band to verify that theperformance is still within specifications.Power Amplifier ReplacementThe SB II power amplifiers are field replaceable.Follow the steps listed below in sequential order.The required tools are a #1 Phillips screwdriverand a 5/16” open-ended wrench.Note: Power to the SB II cabinet mustbe turned OFF during the poweramplifier replacement process.1) Remove the Phillips screws which hold theamplifier into place, refer to Figure 10. The nutsholding the screws are pressed into the cabinetNOTEFigure 10: Remove 14 mounting screws to detach amplifier assembly from cabinet.Remove ScrewsRemove ScrewsRemoveScrewsRemoveScrewsFigure 11: Slide amplifier towards bottom of cabi-net to remove upper cable.61-88-50-UserMan Page 20 of 29
Manual 7-9375-4 Page 15TX RX Systems Inc. 10/29/04and will remain in place when the screws areremoved.2) Slide the amplifier towards the bottom of thecabinet as far as it will go. This will allow the topRF connector to clear the opening. Tilt the topof the amplifier outwards and remove the topRF cable at the SMA connector using the 5/16”wrench. See Figure 11.3) Slide the amplifier assembly towards the top ofthe cabinet as far as it will go. This will allow thebottom RF connector and grey control cable toclear the opening. Tilt the bottom of the ampli-fier outwards and remove the bottom RF cableat the SMA connector and the grey controlcable. To remove the grey cable from the socketon the amplifier it is necessary to squeeze thetop and bottom of the connector together torelease a hold down tab. When properlysqueezed the grey cable will disconnect easilyfrom the amplifier. Refer to Figure 12.4) To replace the amplifier assembly repeat steps1 through 3 in reverse order. When replacingthe RF cables do not overtighten the SMA con-nectors. They should be tightened just slightlymore than hand tight or to the specification of 7in/lbs. The replacement amplifier comes with anattached gasket which must press up againstthe outside of the cabinet firmly and squarely inorder to provide a correct moisture seal.Module ReplacementThe SB II modules are field replaceable. Follow thesteps listed below in sequential order. The requiredtools are a #1 Phillips screwdriver. Two thumbscrews hold each module into place.Note: Power to the SB II cabinet mustbe turned OFF during the modulereplacement process except for theamplifier modules which are “HOT”switchable.1) Loosen the two thumb screws which hold themodule into place. Phillips screws are incorpo-rated into the thumbscrews and they madeneed to be loosened first.2) Grasping the two loosened thumb screws pullthe module straight out of the card cage.3) To install the replacement module place themodule into the guide-rails of the slot and pressdown firmly into place. Each type of module iskeyed uniquely to fit in only one slot within thecard cage. Once the card is seated into placeproperly tighten the thumb screws.The SB II low level and mid level amplifier stagesare field replaceable by simply removing the mod-ule and plugging in a replacement. These modulesare HOT switchable meaning they can be swappedwithout powering down the system. RF cablesattached to the modules must be removed (5/16”wrench) prior to swapping the modules and mustbe re-attached after the new module is in place.when replacing the RF cables do not overtightenthe SMA connectors. They should be tightened justslightly more than hand tight or to the specificationof 7 in/lbs.Modules can be swapped between the uplink anddownlink branches for troubleshooting purposes. Ifa problem exists in one branch and the problemmoves to the other branch when modules areswapped around this indicates a defective module.Note: After an amplifier module isreplaced use the Calibrate Currentssoftware function to properly set theamplifiers alarm trip point, see page 9.Due to slight differences in componenttolerances the trip point must be reset for any newamplifier assemblies introduced into the system.NOTENOTEFigure 12: Slide amplifier towards top of cabinet toremove lower cables.61-88-50-UserMan Page 21 of 29
Manual 7-9375-4 Page 16TX RX Systems Inc. 10/29/04Display/User Interface Assembly ReplacementThe SB II Display/User Interface assembly is fieldreplaceable. Follow the steps listed below insequential order. No tools are required.Note: Power to the SB II cabinet mustbe turned OFF during the display/userinterface replacement process.1) Loosen the two thumb-nuts which hold the dis-play/user interface assembly to the card cage.2) Gently tilt only the top of the assembly up fromthe card cage. Keep the bottom of the assemblyin place. The bottom mounting plate (part of thecard cage) has an overhang on it to support thedisplay/user interface board. If the assembly islifted straight out the overhang it could possiblydamage the interface circuit board.3) With the display/user interface board standingup straight gently move it upwards while lifting itout about an inch or two. This should allow theoverhang to clear the interface circuit boardwithout damage.4) Remove the ribbon cable that connects the dis-play/user interface assembly to the card cage,see Figure 13.5) To replace the display/user interface assemblyrepeat steps 1 through 4 in reverse order.Power Supply ReplacementThe SB II power supply assembly is field replace-able. Follow the steps listed below in sequentialorder. The required tools are a #1 Phillips screw-driver.1) Turn off AC power at the junction box.2) Disconnect the 3 conductor cable that bringsAC power to the supply from the junction box.NOTEFigure 13: Disconnecting the display/user interface assembly from the card cage.Disconnectribbon cablehere61-88-50-UserMan Page 22 of 29
Manual 7-9375-4 Page 17TX RX Systems Inc. 10/29/043) Disconnect the red and black leads from thepower supply that connect to the card cage.4) Remove the Phillips screws that hold the powersupply mount bracket to the back plate andremove the assembly from the cabinet.5) Reverse steps 4 through 2 to install the replace-ment power supply.Filter ReplacementThe filter assemblies are field replaceable. Followthe steps listed below in sequential order. Therequired tools are a #1 Phillips screwdriver with anextended shaft to reach down far enough into theunit to loosen the mounting screws.Note: Power to the SB II cabinet mustbe turned OFF during the filterreplacement process.1) All RF cables attached to the assembly must beremoved (5/16” wrench).2) Remove the Phillips screws that hold theassembly mount brackets to the back plate andremove the assembly from the cabinet.3) Reverse steps 2 and 1 to install the replace-ment filter. When replacing the RF cables donot overtighten the SMA connectors. Theyshould be tightened just slightly more than handtight or to the specification of 7 in/lbs.Card Cage ReplacementTo replace the card cage follow the steps listedbelow in sequential order. The required tools are a#1 Phillips screwdriver with an extended shaft toreach down far enough into the unit to loosen themounting screws.Note: Power to the SB II cabinet mustbe turned OFF during the card cagereplacement process.1) Disconnect the display/user interface assembly.2) Disconnect 4 cables at the backplane of thecard cage which are assessable with the dis-play/user interface board out of the way.3) Remove the row of Phillips screws which holdthe card cage to the back plate. There is a rowof screws at the top and bottom of the cage.4) To install a replacement cage perform steps 3through 1 in reverse order.RECOMMENDED SPARESIt is recommended that one spare of each of thefollowing assemblies be kept on hand for emer-gency repair purposes; Power Supply 8-19938,Uplink Power Amplifier 3-19787, Downlink PowerAmplifier 3-20028, Mid Level Amplifier Card 3-19576, Low Level Amplifier Card 3-19575, LowGain Amplifier Card 3-20294, Attenuator Card 3-20208, Power Distribution Card 3-19833, ControllerCard 3-19832, and the Display/User InterfaceAssembly 3-19831.NOTENOTE61-88-50-UserMan Page 23 of 29
Manual 7-9375-4 Page 18TX RX Systems Inc. 10/29/04Model 61-88-50 Signal Booster SpecificationsPart Number: 61-88-50-A06-G1 61-88-50-B06-G1 61-88-50-C06-G1ElectricalFrequency Range: 896 - 941 MHz 896 - 941 MHz 896 - 941 MHzFCC Identification Number: EZZ5P618850 EZZ5PI618850 EZZ5PI618850Industry Canada Identification Number 1940A-PI618850 1940A-PI618850 1940A-PI618850Number of Passbands: 2 2 2Passband Frequencies: 896-902 / 935-941 MHz 896-902 / 935-941 MHz 896-902 / 935-941 MHzMinimum Passband Separation: 45 MHz 45 MHz 45 MHzPass Bandwidth: 6 MHz 6 MHz 6 MHzMaximum RF Power Output/Passband*: +35 dBm (3 Watts) +35 dBm (3 Watts) +35 dBm (3 Watts)Gain: +80 dB +60 dB +45 dBGuardband: 33 MHz 33 MHz 33 MHzOutput Level Control Range**: 60 dB 60 dB 60 dBSystem Noise Figure at Maximum Gain: 3.5 dB maximum 6.5 dB maximum 6.5 dB maximumThird Order Output Intercept Point: +55 dBm +55 dBm +55 dBmPrimary Supply Voltage: 100-240 VAC; 50-60 Hz 100-240 VAC; 50-60 Hz 100-240 VAC; 50-60 HzAutomatic Battery Backup Option: +24 to +30 VDC +24 to +30 VDC +24 to +30 VDCMechanicalHeight: 24" 24" 24"Width: 24" 24" 24"Depth: 8" 8" 8"Weight 85 lbs. 85 lbs. 85 lbs.Housing Type: Painted Steel Painted Steel Painted SteelEnclosure Type: NEMA 4 Standard NEMA 4 Standard NEMA 4 Standard* Maximum total power** Output control range at maximum gain settingTable 3, Signal Booster ii specifications61-88-50-UserMan Page 24 of 29
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Manual 7-9375-4 Page 23TX RX Systems Inc. 10/29/04CELCIUS FARENHEIT105 221.0104 219.2103 217.4102 215.6101 213.8100 212.099 210.298 208.497 206.696 204.895 203.094 201.293 199.492 197.691 195.890 194.089 192.288 190.487 188.686 186.885 185.084 183.283 181.482 179.681 177.880 176.079 174.278 172.477 170.676 168.875 167.074 165.273 163.472 161.671 159.870 158.069 156.268 154.467 152.666 150.865 149.064 147.263 145.462 143.661 141.860 140.059 138.258 136.457 134.656 132.855 131.054 129.253 127.452 125.651 123.850 122.049 120.248 118.447 116.646 114.845 113.044 111.243 109.442 107.641 105.840 104.039 102.238 100.437 98.636 96.835 95.034 93.233 91.432 89.631 87.830 86.029 84.228 82.4CELCIUS FARENHEIT27 80.626 78.825 77.024 75.223 73.422 71.621 69.820 68.019 66.218 64.417 62.616 60.815 59.014 57.213 55.412 53.611 51.810 50.0948.2846.4744.6642.8541.0439.2337.4235.6133.8032.0-1 30.2-2 28.4-3 26.6-4 24.8-5 23.0-6 21.2-7 19.4-8 17.6-9 15.8-10 14.0-11 12.2CELCIUS FARENHEIT-12 10.4-13 8.6-14 6.8-15 5.0-16 3.2-17 1.4-18 -0.4-19 -2.2-20 -4.0-21 -5.8-22 -7.6-23 -9.4-24 -11.2-25 -13.0-26 -14.8-27 -16.6-28 -18.4-29 -20.2-30 -22.0-31 -23.8-32 -25.6-33 -27.4-34 -29.2-35 -31.0-36 -32.8-37 -34.6-38 -36.4-39 -38.2-40 -40.0-41 -41.8-42 -43.6-43 -45.4-44 -47.2-45 -49.0-46 -50.8-47 -52.6-48 -54.4-49 -56.2-50 -58.0CELCIUS FARENHEITCELCIUS TO FARENHEIT CONVERSION TABLE61-88-50-UserMan Page 29 of 29

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