有线电视共用天线系统安装工艺标准

'有线电视共用天线系统安装工艺标准CableTVshareantennasysteminstallationprocessstandard1,scopeofapplicationThisstandardissuitableforcableTV,satelliteTV,closed-circuitTVandsharingantennasysteminstallation.2,constructionpreparation,2.1materialThe2.1.1cablesystemreceivesantennaselectionrequirements:accordingtodifferentreceptionchannels,receivingsatellite,fieldstrength,receivingringTheareaandthecableTVsystemfacilitiesareselectedtoopencircuitantennasandsatelliteantennastomeettherequirementofreceivingimagequality,andshouldProductcertificate.Allkindsofironshouldbefullygalvanized.Whenthetreatmentisnotgalvanized,itshallbetreatedwithcorrosionprotection.Forexample,use8#leadwireandWireropeandvariousspecificationsofironpipe,Anglesteel,channelsteel,flatiron,roundsteel,14#bindingwire,steelcablecard,flowerbasketbolt,pullringAlloftheseshouldbetreatedwithgalvanizing.Various specificationsofscrew,metalpipebolts,woodscrews,gaskets,springpads,etc.The2.1.3userterminalboxistheportthatthesystemconnectstotheuser"sTV,theuser"sterminalboxisdividedintobrightanddark,andtheboxisintheboxPlasticboxesandironboxes.Userterminalpanelpoints,singleanddoubleholesocketoutletsocketis75Ωimpedance,andshallhavetheproductCertificateofapproval.The2.1.4TVcableshalladoptthephysicalhighfoaminsulationcablewithbettershieldingperformance,whichiscomposedoftheinnerandouterconductorgroupsofthecoaxialshaftIs75Ω,characteristicimpedance,andshallhavethemanufacturer"scertificate.Incaseofdisturbancetothesiteenvironment,thedual-shieldcableshallbechosen.Forcablesthatneedtobesetupinthefield,theself-supportingcableshallbeused,andtheoutdoorcableshallbeblacksheathedcable.2.1.5branches,allocators,andotherpassivedevices:accordingtothedesignrequirements,theproductsshouldbechosenaccordingtothespecifications.Accordingtothedesignrequirement,theantennaamplifier,mixer,splitter,andmainlineamplifierareselectedforthe correspondingtypeandperformance.Branchmainlineamplifier,extensionamplifier,distributionamplifier,cabinet,chassis,highfrequencyhead(LNB),receiver,modulator,Equipmentsuchasdemodulatorandpurificationpowersupply.Shouldchecktheequipment,theequipmentappearanceisintact,thefittingsiscomplete,thenproceedElectricaltest,checkthedevice,theequipmentisworkingnormally,theproductspecificationandthetechnicaldataarecomplete,andshouldhavetheproductcertificateTheimportproductsshouldprovidetheinspectioncertificate.Othermaterials:welds,waterproofelbow,solder,solder,connector,insulator,antennaePoe-mhandsoon.2.2equipment2.2.1measuringinstruments:fieldstrength,testantenna,multimeter,megatometer,monitor,compass,measuringinstrument,leadhammer,etc.2.2.2constructiontools:electricdrill,hammer,pliers,screwdrivers,electricianknives,solderingiron,weldingmachine,specialtoolforjoint,etc. Horizontalrule,largerope,belt,highladder,middleladder,toolbag.Heavyliftingequipment:crane,reversechain.2.3operationconditionTheembeddedsatellitereceivesthebaseoftheantennaandtheburiedpipebeforetheroofoftheconstructionissealed(theroofiswaterproofandthedecorationisdecorated).Withtheconstructionofthewall,theembeddedpipeanduserboxandtheboxhavebeencompleted.Theconstructionofthepaintslurryintheinteriorof2.3.3isfinished,thecoaxialcableinstallationandinstallationarefinished.Theinstallationoftheequipmentinthefrontroomofthefront-endroomshallbefollowedbythefollowingconditions.Theinteriorofthemachineroomisdecorated,thefloor(orantistaticfloor)isfinished.~220Vequipmentpowersupplyand~380Vequipmentpower(antennamotor)powersupplypipe,line,boxallconstructionfinished.Theboxofthedarkboxisfirmlyinstalled.Thefeederlineofthemachineroom,thelineandtheslotare finished,andthemachinecabinetisintroduced.Theinstallationofairconditioning,lightingandmaintenanceoftheengineroomiscompleted.Specialgroundterminalsarereservedforthegroundingofmachineroomequipment.2.4preparationTheconstructionunitmustholdtheconstructionqualificationofthesystemproject.Thedesigndocumentsandconstructiondrawingsarecomplete,Theschemeisdesignedtomeettherequirementsofstate,industry,localstandardsandconstructionunitsApprovalbyrelevantindustrymanagementdepartment.Thedesignerhasadetailedtechnicalbackgroundontheconstructionpersonnel.Beforeconstruction,theconstructionsitesurveywillmeettherequirementsoftheconstructionanddrawingofthesystem.3,theoperationprocess3.1processflowSiteselection TheantennainstallationInstallationoffrontendequipmentandmachineroomequipmentTransmissioninstallationUserterminalinstallationGroundinginthesystemSystemdebugacceptance3.2operationmethod3.2.1siteselectionThereceivingfieldshouldbesatisfiedwithopenandopenconditions,andavoidtheshieldingandsurroundingmetalinthetransmissiondirectionComponents,andavoidfactorsthatmaycauseinterference,suchashigh-voltagepowerlines,elevatormachines,airplanelanes,andmicrowavedryingDonotgettooclosetotheroad.3.2.1.2antennaheightshouldberaisedashighaspossible,avoidingtheshadowareaofthesurroundingtallbuildingsandimprovingreceptionlevel. Improvesthenoiseratioofthesystem.3.2.1.3satellitereceivingantennainstallationlocationcanalsochoosetobeinunobstructedground,whichcanbeusedtoblockmicrowaveinterferenceThediameteralsoreducesthewindloadontheroofofthesatellitereceivingtheantennaandimprovesthesafetyofthesysteminstallation.Thelocationofthe3.2.1.4siteismoderate,choosingtobeatthecenterofthewholesystem,sothatthemainlineofthesurroundingradiationwillbereducedThetransmissionlengthofthetrunkline.Thedistancebetweenthefrontandantennareceivingstationsshouldbelessthan50meters.3.2.1.5beforeinstallingtheantenna,thetestantennaandtestinstrumentshouldbeusedtosurveythesiteandselectthebestimagequalityPositionandinstallationheight.3.2.2antennainstallation:3.2.2.1satellitereceivingantennainstallation:Principleofinstallation:strictlyfollowtheinstructionsoftheproductandbeoperatedbyprofessionaltechnicians. Aeriallightning:iftheantennaisintheprotectiverangeofthebuilding"slightningrod,theantennadoesnotneedtosetupalightningrod.Ifit"sintheprotectionvanInaddition,alightningrodshouldbeinstalledonthetopofthemainreflectingsurfaceandthetopofthesecondaryreflector,whichshouldcoverthewholemainreflectorFigure3.2.2.1-1);Theinstallationheightshouldensurethattheantennaisplacedwithintheprotectiverange(seechart)3.2.2.1-2).Thelightningrodgroundshouldbeindependentoftheline,anditisstrictlyforbiddentogroundthelightningrodtothegroundconnectionoftheindoorreceivingequipment.ThelightningrodThelightningrodThelightningrodLightningrodThevicereflectivesurfaceThemainreflectorBasedonthepierFigure3.2.1-1satellitereceivesanaeriallightningrodinstallationfigure1,3.2.1-2satellitereceivestheantenna lightningrodinstallationfigure2Antennabase:accordingtotheproductdatasuppliedbytheantennamanufacturer,accordingtothedataoftheantenna"sself-gravityandwindload,thebasesnailisburiedBoltsandbasicsteelplatesshallbekeptinaccordancewiththeplaneheightofeachbasepier.Verticalsuspension:aftercalibratingthesizeandpositionofthepre-buriedbolt,theantennaismountedandfixedonthepre-buriedboltFlatwasher,springwasheranddoublemothertotighten,theboltexposedpartshouldbeevenlyspreadbuttertopreventmetalrust.Assemblyoftheantenna:accordingtotheorderofthefactory,thescrewshouldnotbefastenedonceintheprocessAftertheassemblyiscompleted,theconsolidationiscarriedouttopreventdamagetotheantennaintheinstallationprocessandtheaccuracyoftheeffect.Thewholeassemblyoftheantenna:thewholeassemblyoftheassembledantennaismountedonthemountedantennamaincolumnandboltedtothemast.inIntheprocessofassembling,weshouldpayattentiontotheweightofthesuspensionintheframeoftheantenna,soastopreventthedeflectionofthecenterduringtheloadingprocess Leavingtheantennatotiltordamagetheantennasurface.Iftheantennadiameterisgreaterthan4m,theantennaliftingschemeshallbedevelopedTheprojectisunderconstruction.Antennadirectionselection:themaximumreceptiondirectionofthesatelliteantennaistoadjusttheelevationAngleandtheazimuthAngle,whichistheleasttomonitortheimagenoise(ornot)andpayattentiontothebalanceofimagequalityondifferentTVsatellitechannels.3.2.Generalrequirementsforinstallationof2.2openantenna:Severalopenantennascanbesetupbycommonpoles,ortheycanbeseparatelysetupseparately.TheremustbeacertaindistancebetweentheantennaeandthehorizontalbetweenthepolesFrom5metersorhigher;Theverticalbarinthesamedirectionis15metersormore.Donotusetheantennaebeforeandafter,thesamestemtwodaysThelinespacingshouldnotbelessthanthelambda/2(lambda:wavelength)ofthelongerwavelengthantennaandtheminimumspacingisonemeter,andtherightsideoftheantenna Thelambdaisgreaterthanthewavelengthofthelongwavelengthantenna.Morethan5metersThespacingoftherightantennaLambdalambdalambda/2,ThespacingofthemastMorethan15metersThespacingoftheantennaeisthespacingoftheantennaeFigure3.2.2.2thespacingoftheantennas(2)antennaheightselection:theantennashouldnotbelessthanonewavelengthfromthegroundorroof.RadiowavesshouldbeconsideredfortransmissionIntheprocess,thereisnotonlyreflection,butalsothereflectionoftheinhomogeneityofairmediaTheimage,appropriateadjustmentlevelpositionandheight,toreceivethesignalqualityisthebest.(3)antennadirectionselection:selectthemostpowerfulantennadirection.ThemaximumreceptionoftheopenantennaisaimedattheTV Theejectiontower(TVsource),butsometimestoavoidthesourceofthedisturbanceorbecausethereisanocclusioninfront,itcanbemadeaccordingtotheactualsituationThemaximumreceivingdirectionofthereceivingantennaisslightlytweaked.(4)pre-buryingofthebaseoftheopenantenna:theantennapedestalshouldbeconstructedwiththeconstructionoftheearth,andwhentheroofpanelismade,itispreparedtoburytheboltOrthefloorbolt.Theembeddedboltsshouldnotbelessthanthephi25mmx250mm,andthediameterofthesteelshouldnotbelessthanthediameterofthesteelPhi8mm;Thediameterofthesteelisnotlessthanthediameterofphi12mm.(also,thebaseofthebaseis4mmby25mm.Weldingwiththebaseplate;Thethicknessoftheplateshallnotbelessthan6mm.Thebaseheightshouldnotbelessthan200mm;waterThemortarwillbeflatandsmooth.Goodembeddedanchoratthesametime,threeo"clockinthe120°Angleposition,TABUSESthestraightThediameterphi8mmismadeofgalvanizedroundsteel,thebottomandstructuralsteelwelding,theweldinglengthissixtimesthediameteroftheroundsteel,andbesides Removethecoatingandsmoothitwithcementmortar.3.2.2.3antennaverticalbarandpullwireinstallation:(1)theverticalbarofthemulti-sectionpole:theverticalbarofthemulti-sectionpoleshouldbemadeupfromthebottomtothebottom,andthepiecesoftheshaftshallbestrong,suchasFollowingfigure:Figure3.2.2.3daylinedrawingThecombinedlengthofDCisnotlessthanonewavelength(2.5-6m);otherwiseitwillaffectthenormalreceptionoftheantenna.SectionBisthefixedantennasection,whichisaboutthelengthofthefixedantenna,usuallyabout3m.AsegmentisAlightningrod,whichgenerallyUSESphi20mmroundsteel,whichismorethan2.5mlong(2)preventingelectricalaccidentscausedbyhighwindsandearthquakes.TheantennaisrequiredtomaintainthelineandthehighpressurelineAcertaindistance,asthetableshows:Voltageoverheadcabletypeandthedistanceofthetelevisionantenna(m) Barewire>1Lowvoltageoverheadinsulatedwireandmulti-corecable>0.6Highvoltageinsulatedwireorlowvoltagepowersupply>0.3Barewire>1.2Highvoltageoverheadinsulatedpowerline>0.8Highvoltagepowersupply>0.4(3)verticalbar:thesiteshouldbecleanandtidy,andthecomponentsthatarenotconnectedtotheverticalbarwillbeplacedoutsidetheverticalbar.PersonnelandtoolsItshouldbeready.First,connectthetop,middleandlowerrod(welding),tightenscrew,andtieupthethreadrodHangonthestick;Thesteelcablesshouldbestrong;Centerinsulatedporcelainbeadsocket;ThebasketboltsareloosetotheproperpositionPlacethemastinthepositionoftheanchorintheanchorposition.Allready.Theon-sitecommandgivesthepasswordunifiedaction,thepolestandsup,theforceshouldbefairwhenthepoleisup,preventtheleverfromturningleftandright.then Usethebasketbolttocorrectthetension.Use8#~10#leadwiretosealthebasketbolt.LineofpullandverticalbaroneA45°to30°~;Ifthemastistoohigh,useadoublelayer.ThewireshouldbedrawnawayfromtheantennareceivingtheelectromagneticwaveTothe.(4)theanchormustbefirmlyattachedtothebuildingandmustnotbeattachedtotheroofventpipeandwaterpipe.Installationofthe3.2.2.4antenna(1)beforetheantennaissetup,theantennashouldbecarefullyinspectedandtested.Theantenna"soscillatorshouldbeplacedhorizontallyandadjacentThesetoftheoscillatorshouldbeparallel,andthefixedpartsoftheoscillatorshouldbesecuredbythespringmat.Thefeedershouldbefixedincasethewindblows.Andmakesuretomakesurethatyouhaveawatertightinthehead.(2)assembletheantennaeoftheapprovedantennasonthecrossshoulder,andthepartsoftheantennaareinstalled,andtheropeiscarriedbyaropethroughthetoppulleyThehorizontalarmoftheassembledantennaishoisteduptothedesiredlocation,andthestaffonthepolewillattachthe crossarmtotheantennacard.(3)eachchannelantennashallbeassembledattheappropriatepositiononthemast.Principlehighchannelantennaontop,lowchannelTheantennaisbelow,thedistancebetweenthelayerandthelayerisgreaterthanlambda/2.(4)todeterminethebestreceptionoftheantennabyobservingthereceivingimageofthemonitorandreadingthefieldstrengthmeasurementvalueFixedline.Theoutsidedeviceandequipmentshouldbewaterproof.3.2.2.2.5groundwireproduction:whenthebuildinghasalightningnet,thefourmmby25mmofflatsteelortheroundsteelof10mmwillbeusedThemainrod,thebaseandthestructureareconnectedinone.Theantennamustbewithintherangeofthelightningrodprotection.ThegroundingresistancevaluePracticeshouldbelessthan1Ω.Formoreinformationonthelightningprotectionandgroundinginstallationtechnologystandard"intherelevantsections.3.2.3frontroomequipmentinstallation: Theoperationprocessof3.2.3.1StabilizingrackEquipmentinstallationEquipmentwiringandidentificationEquipmentgroundingpower3.2.3.2stabilizers:positiontheequipmentcabinetaccordingtothefloorplanofthemachineroom.Thepositionthatcorrespondstointhemachineark,willantistaticgroundBoardgroovestoensurethatthecableunderthefloorisbroughtintothecabinet.Whenthecabinetismorethan1.8metershigh,thenumberofinstallationsisgreaterthanthatWhentheloadoftheplateisloaded,thecabinetwillbefirmlyinstalledonthechannelsteel,anditwillbefixedwithboltsandanti-loosewashertopreventtheover-loadingofthemachineDamagetoboardandequipment.Thecabinetshouldbekeptupright.Whenthecabinetisplacedsidebyside,thegapbetweenthetwocabinetsshouldnotbegreaterthan2mm.Thecabinetpanelshallbeinthesameplaneandparalleltothebaseline,andthedeviationshouldnotbegreaterthan2mm. Installationof3.2.3.3equipment:theequipmentinstalledonthecabinetshouldbearrangedorganicallyaccordingtotheusagefunction(seechart3.2.3.3).Usethescrew,gasketandspringpadsthatareconfiguredwiththecabinetandattachtheequipmenttothecabinet.UpanddowneachdeviceSpaceshouldbeleftwithaspaceof1U(orgreaterthan50mm)tokeeptheairflowingandcoolingspaceonthetopandbottomoftheequipment.Thespaceisenclosedinaspecialblankpanel.Forequipmentinstalledonnon-19"standardcabinets,standardtrayinstallationsareavailable;ThecolorColormonitorshouldbeinstalledwithspecialTVspecialtrayandpanel.Program1receiverProgram1modulatorProgram2receiverProgram2modulator4modulatorProgram4receiverProgram3modulator Program3receiverProgram6modulatorProgram6receiverProgram5modulatorProgram5receiverFrontortrunkamplifiermixerProgram7modulatorProgram7receiverSpareandspareFigure3.2.3.3equipmentlayoutschematic3.2.3.4devicewiringandidentification:(1)themachineroomusuallyadoptsthegroundlineslot,thecableisintroducedbythebottomofthemachinecabinet.Thecableshallbemadestraight,withoutanewtwist,andshallnotbefastenedMr.;Whenthecableisintheslot,itshouldbetiedupinthe corner,andtheradiusoftheturningradiusshouldnotbebroken.(2)whenusingthecablebridge,thecableshouldbebroughtintothecabinetabovethecabinet.(3)useTVcableandtypeFspecialplugtoconnecttheequipmentaccordingtothedrawing.BringthepowersupplytothecleanpowersupplyLater,Itisalsousedinthemachineroom.ThecableandpowerlinesonthebacksideoftherackshouldbeplacedonbothsidesofthecabinetIntheslot,thebundleistiedtotheloop.Equipmentinstalledinthecabinetshallidentifythechannelsreceivedbytheequipment;TheendsofthecableshouldbeleftoverMeasureandmakepermanentmarkers.3.2.3.5equipmentground:itispossibletointroducethemachineroomequipmentaftertheexternaloverheadcableisdrawndown/intotheline.WithinthecomputerroomLightningarrester,machinecabinet/box,equipmentmetalcase,cablemetalsheath(orshieldlayer)shouldbeconnectedtothemaingroundbusinthemachineroomOn.Totalfront-endcomputerroomgroundingdeviceΩgrounding resistanceisnotgreaterthan1.The3.2.3.6devicesareconnected.3.2.4transmissioninstallation:AnAnnwithasourcedevice(forexample,mainlineamplifier,branchmainlineamplifier,extensionamplifier,distributionamplifier)Loading:Thepositionofthemainlineamplifier,branchlineamplifier,extensionamplifieranddistributionamplifiershouldbestrictlyaccordingtotheconstructiondrawingsIntheconstruction.(2)intheMingsuit:theTVcableneedstobesetupbythemast,thefieldamplifierismountedonthemast,oraboutonemeterWithinthearea,andshouldbefixedinthecablewire,thefieldamplifiershallbesealedbysealingrubbergasketandadoptedThewell-cooledcastingaluminumcase,theoutersurfaceoftheenclosure,issuitableforthemeshmetalhighfrequencyshieldingring,whichguaranteesgoodcontactwiththeground,andtheinsertionAgoodwaterproofandanti-corrosionresistanceisneeded,and therubbercaseiswaterprooftotheoutside.AnamplifierandotherdevicesthatarenotwaterproofItshouldbeinstalledinawaterproofmetalcase.(3)indarkclothing:accordingtothedesignofthedrawing,apanelisplacedinsidethebox,andtheinsideoftheboxisfixedbymachinescrewInthebox;Thedeviceontheswitchboardisdrawnonthebackoftheboardtothefrontoftheboard.PostintheinnerdooroftheboxThesystemdiagramoftheequipmentinthebox,showingthedirectionofthecableandthesignalinputandoutputlevel,sothattheinspectionwillberepairedinthefuture.(4)thereshouldbeanoverhaulpowersupplyintheamplifierbox.3.2.4.2cableinstallation:(1)thelengthofthemaincableshallbeselectedaccordingtothelengthofthedrawingandshallbemadetoavoidthetransmissionofthemaincableCableconnection.(2)whenthecableislaidout,thepipeshallbecleared,andthecableshallbetiedwiththelineofthebeltwhichisreservedinthepipe Pullthecableintothepipe.(3)whenthecableoverheadislaid,thecablecanbefastenedtothepolebyasplint,andthecableisattachedtothecableThemessengerwire.Thespacingofthehooksis0.5mto0.6m.Thereisacertainamountofhangingovertheclimate.(4)whenacableorcableisintroducedunderground,itshallbeprotectedbysteelpipeatadistanceof2.5mfromthegroundProtection;Thepipeshallbeburiedintheground0.3m~0.5m.(5)tosetupthecablealongthewall,thewallandtheironwillbemountedonthewall,andtheslingwillbeattachedtothecross,andthenthecablewillbeattachedHangthecableinthesling.Thewallisnotmorethan6m.(6)whenthecableisburiedinadirectway,itmustbeusedwithacablethatcanbeburieddirectlyinawire,whichshallnotbelessthan0.8m.tightThecableshallcover10cmwithfinesoil,coverandmark.Inthecoldarea,itshouldbeburiedunderthetundra.Theinstallationofthe3.2.4.3branchdispatcher:Thebranchdistributorshallbeinstalledinthebranch distributorboxorintheamplifierbox,andshallbefixedintheboxwiththemachinescrewOn;Thesizeoftheboxshallbedeterminedaccordingtothenumberofequipmentinthebox,andtheboxbodyshallbemadeofiron,anditmayhaveasinglefanordoubledoor,whichisintheboxThegroundboltsarereserved.Theboxisequippedwithaswitchboard.3.2.5distributionnetworkinstallation:theinstallationofthedistributionamplifier,theinstallationofthebranchdistributorandthepowerofthebranchdistributorCableinstallationandinstallationofuserterminal.3.2.5.1userterminalinstallations:Inspectthemouthoftherepairbox:checktheopeningoftheboxandmakesureitissmoothandsmooth.Theoutsidemouthoftheboxshouldbeflushwiththewall.boxTheelevationshouldmeettherequirementsofthedesignspecificationwithoutspecialrequirements.TheTVuserterminalis300mmfromtheground,fromthestrongelectricaloutletThelevelis500mm.Theboxesshouldbestrong. CablesheathCableshieldinglayerCableinsulatedmediacablecoreLinecardFigure3.2.5.1userterminalpressurediagram(2)connectthecableintheboxtothelengthof100~150mmfirst,andtheninsulatethe25mmcableThesheathisstrippedoff,andtheouterwireisscatteredandthenwovenintoabundle.The3mminsulationand12mmcorearesetasideTerminal,withΩpress-fittingcoppernetwork.Asshowninfigure:(3)fixedliftedthelid,theimpedanceoftheuseroutletis75Ω,usemachinescrewstofixthepanel.3.2.6systemground3.2.6.1shieldingandmetalgrounding:inordertoreducetheinterferenceofdeviceswithinthecablesystem(includinghighfrequencyinterferenceAcinterference)andpreventlightning,themetalenclosureofthedeviceisrequiredtobegrounded,fullyconnectedandwell grounded.3.2.6.2metalpipingshallbegroundforthewholeasawhole.Themaintenancepersonnelof3.2.6.3areregulargroundcheck.3.2.7systemtests3.2.7.1antennadebugging(1)whentheantennaissetup,itshouldcheckthelocationofthereceptionchannel.SatelliteTVantennaepitchandThepositionofazimuthisnormal.(2)usingthefieldstrengthinstrumenttomeasuretheleveloftheantennareceivingsignal,andthedirectionoftheantenna,thelevelindicatorofthefieldstrengthisthemostBig.Atthesametime,observethequalityofthetelevisionimageandthequalityofthesound,noshadow,nosnow,nonoise(oroccasionalnoise,Whenyoudon"thateit,fixtheantennaandtietheantenna"ssignaltothefeedline.3.2.7.2frontenddevicedebugging(1)thechannel"sTVsignalisconnectedtothemixer,thetestofthemixeristestedbythefieldstrengthinstrument,andtheoutputofeachchannelisadjusted Theleveloftheoutputlevelofthechannelisbelow2dB.Theadjustmentknobofthemixercannotreach2dBWhentheadjustmentispoor,thechannelwithhighlevelvalueincreasestheattenuator.(2)adjustthereceptionfrequencyandotherparametersofthesatellitereceiverandadjusttheoutputlevelofthemodulatortotheequipmentThenominallevelvalueiscalled,andthechanneltuningknobandamplifierofthemixerareadjustedproperlythroughtheoutputtestofthemixerTheoutputlevelofthemixeristheoutputlevelofthemixer,theoutputlevelofthemixerisatplusorminus1dB,andthelevelofthelevelisinaccordancewiththedrawingdesignrequirement(ifnodrawingissetupThemeasuresshouldbecarriedoutbeforeconstruction,whichshallbecalculatedandmeasured,andtheleveloftheactiveequipmentshallbecalculated.(3)debuggingofthefrontamplifier(ormainlineamplifier)ofthecomputerroom:adjusttheoutputleveloftheamplifieraccordingtothedrawingdesignrequirementKnobs,equalizerknobs(orinterpolationofappropriateattenuationvalues)tothelevelofthedrawingdesign,usuallybytheamplifier Theoutputlevelshouldnotbegreaterthan100dB(forthelargersystem,thetransmissionlinklengthsystemrecommendslowerlevel),phaseTheleveloftheadjacentchannelislessthan0.75dB,theleveldifferencebetweenthechannelsislessthan2dB.(4)afterthefront-endequipmentisdebugged,thesignalistransmittedtothemainlinesystem.3.2.7.3-lineamplifierdebugging:adjusttheoutputlevelandoutputleveloftheoutputlevelaccordingtothelevelofthedrawingdesignSlope.Iftheimageisgeneratedandintermodulationinterferes,theoutputleveloftheamplifierishigherthanthatofthesystemindexFlatshouldberedistributed,adjustedaccordingtothedesignvalueofthereproducingamplifieroutputlevel.3.2.7.4distributionnetwork:adjusttheoutputlevelandtheslopeofthedistributionamplifieraccordingtothedrawingdesignrequirement.InthesystemTheuserterminalistestedtoseeiftheuserterminallevelhasmetthedesignrequirementsofthesystem,ifthedesignrequirementsarenotmetTheoutputlevelandtheslopeofthedistributionamplifier areadjustedtomeetthedesignrequirementsofthedrawing.systemTheuserterminallevelcontrols64++4dBandUSESacolormonitortoseeifthequalityoftheimageisclearandwhethertherearesnowflakesorbarsLines,alternatingcurrent,etc.3.2.8systemacceptance:fieldtest,fillinfront-endtestrecord,amplifierleveltestrecord,userterminallevelmeasurementRecordandcheckintherelevantadministrativedepartment.4,finishedproductprotectionWheninstallingtheantenna,mainpoleandsatelliteantennaontheroof,nodamagetothebuilding,roofwaterproof,anddecorationshallbemaintainedSiteclean.Theboxandboxsetintheceilingshallnotdamagethekeelandtheceilingwhenthepartsareinstalled.Thesurfaceofthedeviceshallnotbedirtyandthewatershallnotbeenteredintothedevice.Whenusingaladder,theWindowsandwallsshallnotbetouched. Payattentiontoqualityissues5.1nosignalMeasures:(1)failureofthefront-endpowersupplyorthefailureofactiveequipment.Checkthesupplyvoltageormeasuretheinputsignal.(2)receivingantennasystemfailure.Shouldcheckshortcircuitandopencircuittransmissionline,connectplug,front-endfrequencyconverter,frontendantennaamplificationAndetc.(3)powerfailureoflineamplifier.Checktoseeiftheinputplugisopen,checkthepowersupply,powersupply,etcTochecktheoutputsignalofeachamplifierandwhetherthepowersupplyisnormalattheendofthesignal.(4)trunkcablefailure,checkwhetherthecablebetweenthefirstandalllevelsofamplifierisopenorshortcircuit,andcheckallkindsofcableplugsHead.5..2signalisweak,allsignalhassnowflake,thisphenomenonissignallevelisnotmetstandardlevel. Measures:(1)theantennareceivesasystemfailure,andtheimageofthereceivingsignalinthefrontendisclear,andtheorientationoftheantennaisdeviated.(2)thefrontenddevicehasafault,seetheinputofthesourcedevice,theoutputisnormal,iftheequipmentisnormal,watchthecablefeederandsoonNoshortcircuitphenomenon.(3)transmissionlinefailure,whichisdirectedbythefaultsourcetothetargetsourcetochecktheoutputsignalofeachamplifierandthepowersupplyoftheamplifierThepowersupplyisnormal.(4)whetherthepassivedeviceinthenetworkhasashortcircuitandthecableisdamaged.5.3imageghostingProcessing:theproblemofantennareceiving.Useamonitortoobservethequalityoftheimagereceivingthetelevisionsignal.Becausethefieldofreceptionofthelocalreceptionisstrong,itmustbetransferredtothesignaltransferchannelonthefrontend.Ifit"sashadow,it"sbecause Thereceivingsignalofthefrontendisreflectedbythesurroundingbuildings,adjustthepositionoftheantennaappropriately,andavoidthereimagecausedbyreflection.The5.4imagesshowstreaksandcrosschannelinterference:Processing:theoutputlevelofactivedevicessuchasamplifiersistoohigh,exceedingthemaximumoutputleveloftheamplifier,ormorethanthatIndicatorsofsourceallocation.Lowerthelevelproperly.SomeimageshavestripesandsomeareclearTreatment:thelevelofthechannelistoolarge,causingthechanneltointerferewiththelowlevelchannels.Theelectricityshouldbelevelledoff.The5.6imageshowsthecommunicationscrollingthroughtheinterferenceProcessing:thesystem"sshieldearthingisnotwelldone,inthefaultareaandinthepreviousamplifierandtheshieldofthebranchandcableBeabody,reliableground.'