资源描述：
《有线电视共用天线系统安装工艺标准》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、有线电视共用天线系统安装工艺标准CableTVshareantennasysteminstallationprocessstandard1,scopeofapplicationThisstandardissuitableforcableTV,satelliteTV,closed-circuitTVandsharingantennasysteminstallation.2,constructionpreparation,2.1materialThe2.1.1cablesystemreceivesantennaselectionrequirem
2、ents:accordingtodifferentreceptionchannels,receivingsatellite,fieldstrength,receivingringTheareaandthecableTVsystemfacilitiesareselectedtoopencircuitantennasandsatelliteantennastomeettherequirementofreceivingimagequality,andshouldProductcertificate.Allkindsofironshouldbefu
3、llygalvanized.Whenthetreatmentisnotgalvanized,itshallbetreatedwithcorrosionprotection.Forexample,use8#leadwireandWireropeandvariousspecificationsofironpipe,Anglesteel,channelsteel,flatiron,roundsteel,14#bindingwire,steelcablecard,flowerbasketbolt,pullringAlloftheseshouldbe
4、treatedwithgalvanizing.Variousspecificationsofscrew,metalpipebolts,woodscrews,gaskets,springpads,etc.The2.1.3userterminalboxistheportthatthesystemconnectstotheuser'sTV,theuser'sterminalboxisdividedintobrightanddark,andtheboxisintheboxPlasticboxesandironboxes.Userterminalpa
5、nelpoints,singleanddoubleholesocketoutletsocketis75Ωimpedance,andshallhavetheproductCertificateofapproval.The2.1.4TVcableshalladoptthephysicalhighfoaminsulationcablewithbettershieldingperformance,whichiscomposedoftheinnerandouterconductorgroupsofthecoaxialshaftIs75Ω,charac
6、teristicimpedance,andshallhavethemanufacturer'scertificate.Incaseofdisturbancetothesiteenvironment,thedual-shieldcableshallbechosen.Forcablesthatneedtobesetupinthefield,theself-supportingcableshallbeused,andtheoutdoorcableshallbeblacksheathedcable.2.1.5branches,allocators,
7、andotherpassivedevices:accordingtothedesignrequirements,theproductsshouldbechosenaccordingtothespecifications.Accordingtothedesignrequirement,theantennaamplifier,mixer,splitter,andmainlineamplifierareselectedforthecorrespondingtypeandperformance.Branchmainlineamplifier,ext
8、ensionamplifier,distributionamplifier,cabinet,chassis,highfrequencyhead(LNB),receiver,mod
