资源描述：
《有线电视共用天线系统安装工艺标准（installation standard of catv common antenna system）》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（InstallationstandardofCATVcommonantennasystem）InstallationstandardofCATVcommonantennasystem1,scopeofapplicationThisstandardappliestocabletelevision,satelliteTV,closed-circuittelevisionandcommonantennasysteminstallationworks.2、constructionprepar
2、ation2.1materialsTheselectionofreceivingantennafor2.1.1CATVsystemshallbebasedondifferentreceivingchannels,receivingsatellites,fieldstrengthandreceivingringsAswellascableTVsystemfacilities,scaleselection,opencircuitantennaandsatelliteantenna,tomeettherequirement
3、sofreceivingimagequality,andHaveproductqualificationcertificate.2.1.2allkindsofironpartsshouldbegalvanized.Corrosiontreatmentshallbecarriedoutwhengalvanizingisnotallowed.Suchastheuseofwireand8#Steelwireropeandallkindsofironpipes,angleiron,channelsteel,flatiron,
4、roundsteel,14#tiewire,wireropecard,flowerbasketbolt,pullringZincplatingshallbeadoptedforequaltreatment.Allkindsofmachinescrews,metalexpandingbolts,woodscrews,washers,springmatsandsoonshouldbegalvanized.The2.1.3userterminalboxistheportthatthesystemconnectswithth
5、eusertelevisionset,andtheuserterminalboxisdividedintothebrightandthedarkboxesPlasticboxtwo.Userterminalpanelsocket,singleholeanddoubleholesocket,socketimpedanceis75,andshouldhaveproductsCertificate。2.1.4TVcableshallhaveahighperformancePEfoamcablewithgoodshieldi
6、ngperformance.ItiscomposedofcoaxialinnerandouterconductorgroupsTheproducthasacharacteristicimpedanceof75ohmsandshallhaveaproductqualificationcertificate.Doubleshieldedcablesmaybeusedtointerferewiththesiteenvironment;Fortheoverheadcable,theself-supportingcablesh
7、allbeadopted,andtheoutdoorcableshallbemadeofblacksheathcable.2.1.5branch,distributorandotherpassivecomponents:accordingtothedesignrequirements,choosedifferentspecificationsofthedevice,andshouldhaveproductqualificationcertificate.2.1.6accordingtothedesignrequire
8、ments,selectthecorrespondingtypeandperformanceofantennaamplifier,mixer,waveseparator,trunkamplifier,Branchedtrunkamplifier,extendedamplifier,distributionamplifier,cabinet,ch
