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1、卫星接收系统(Satellitereceiversystem)ThispapermainlyintroducesthecompositionofCATVsatellitereceivingsystem,andgivesadetaileddescriptionofeachpartoftheequipment,andintroducestherelevantoperationandmaintenanceitems・Keywords:SatelliteTVreceivingantennatunerfirstifCableSplit
2、tersatellitereceiversatellitetransmissionlinkSunoutageandsatelliteeclipsefinderloopthroughcommonfaulttransientbreakinggroundwithfrequencyinterferenceInthecabletelevisionsystem,thesatellitesignalsourceoccupiesaverylargeproportion.Inourfrontroom,forexample,36setsofpr
3、ograms,thereare22setsoftheuseofsatelliteprogramsasasignalsource,andifyouaddsomeimportantprogramsbackupsignal,satelliteprogramsreached26sets・Therefore,howtoguaranteethehighqualityandhighreliabilityofsatellitesignalsourceisthekeypointthatmustbeconsideredintheconstruc
4、tionandmaintenanceofCATVfront-end.Thisarticlewillcombinethecabletelevisionsatellitereceivingsystem'scomposition,carriesonthemoredetailedexplanationtoeachpartofequipment,simultaneouslyintroducestherelatedoperationandthemaintenanceitem,onlyforthecolleaguereference・In
5、adequaciesinthisarticle,pleasecriticizeme.I.ThecompositionofthesatellitereceivingsystemThesatellitereceivingsystemmainlycompletesreceivingsatellitesignals,thesatellitereceivingantenna,tuner,firstintermediatefrequencycable,powerdividerandsatellitereceiveriscomposedo
6、fseveralparts,sometimesincludinglineamplifier・Theformofanalogsatellitereceiversystemanddigitalsatellitereceiversystemisexactlythesame,becausethetwokindsofreceiversarethefirstintermediatefrequencysignal,andthefirstintermediatefrequencysignalforthemodulatedwave,which
7、belongstothecategoryofanalogsigna1.Thesatellitereceivingsystemcanbedividedintotwoparts:indoorandoutdoorpartcomprisesasatellitereceivingantenna,tuner,firstintermediatefrequencycable,sometimesalineamplifier;theindoorpartcomprisesapowerdivider,analogsatellitereceivera
8、nddigitalsatellitetv.Thetypicalconnectionblockdiagramisshownbelow.Thesatellitereceivingantennawillbroadcastsatellitereceivingelectromagneticwaved
