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Antenna amplifier



Introduction

AboutAntennaAmplifier

AntennaamplifierisgenerallycalledMastheaderAmplifierinEnglish,anditisalsocalledPre-amplifierorAntennaAmplifier,Amplificador,etc.insomeEuropeanandAmericancountries.UHF,broadband,lownoiseamplifierbetweenantennaandfeeder.TocompensateforthelossofthetransmissiondistancebetweentheantennaandtheTV,andtoensurethatthedistributorobtainsthenecessaryinputpowerinthesharedantennasystem.

Whenwereceivelong-distanceTVprogramsorterrestrialhigh-definitionTVprograms,theTVsignalisgenerallyweak.Atthistime,weneedtouseamulti-unitTVantennawithstrongdirectivityandhighgain,andtheantennaSetitupashighaspossibleandinanopenplace.Ifyoufeelthatthereceivingsituationisnotidealenough,youneedtoinstallanantennaamplifierbetweentheantennaandtheTVtoincreasethereceivingsensitivity,sothattheTV’simageisstableandthesoundisgood.

Afterusingtheantennaamplifier,itislikeaddinga"telescope"totheTV.ItcanamplifytheweakTVsignalreceivedbytheantenna,butofcourse,intheprocessofreceiving,morethanjustamplifyingIt'saTVsignal,anditalsoincludesallkindsofnoiseandinterference.UsuallyundertheantennaamplifiercanamplifytheTVsignaltotentimesormore.Theantennaamplifierisactuallyasuperhigh-bandamplifier.Thereceivingchannel,frequencyrangeandoverallgainofvarioustypesofantennaamplifiersaredifferent.

Payattentiontotheproblem

(1)PayattentiontotheinstallationpositionTheantennaamplifierusuallyconsistsoftwoparts:theamplifyingpartandthepowersupply.Whentheantennafeederlineisshort(generallyreferstotheuseofindoorantennas),theantennaamplifiercanbeplacednexttotheTV;whentheantennaissetuphigherandthefeederlineislonger,thetwopartsshouldbeplacedseparately,andtheamplifyingpartshouldbesealedbyawaterproofboxLater,itisbesttoinstallitattheendofthesupportrod1~1.5mawayfromtheantennaelement,andthepowersupplypartcanbeplacedneartheTV,whichcanimprovethesignal-to-noiseratiooftheTVsignal.

(2)Channelsmustmatch.Antennaamplifiersaregenerallydividedintotwocategories:VHFandUHF.TheVHFtypecanamplifytheTVsignalofchannels1to12,andtheUHFtypecanamplifytheTVsignalofchannels13to68.Wheninuse,theantennaamplifiershouldmatchtheTVchanneltobereceived.

(3)PayattentiontoimpedancematchingTheoutputimpedanceoftheantennaamplifierandtheoutputendoftheantennaandtheinputimpedanceoftheTVshouldallmatch.Thefeedershouldnotbetoolong,thatistosay,theantennashouldnotbeerectedtoohighortoofar.Otherwise,althoughtheantennaamplifierisaddedtotheTV,theincreasedsignalwillbeseverelyattenuatedduringthetransmissiontotheTV,resultinginlittleimprovementinthereceivingeffect.Inaddition,theinputandoutputfeedlinesoftheantennaamplifiercannotoverlaporbetooclosetoavoidfeedbackorinterference.

(4)Thegainmustbeselected.Thegainofvarioustypesofantennaamplifiersisdifferent,generallytherearehighandlowpoints.High-gainantennaamplifiersusuallyhaveagainof30to60dB,andinconjunctionwithamulti-channelYagiantenna,theycanreceiveTVprogramshundredsofkilometersaway.Thelow-gainantennaamplifierhasagainof20-40dBandcanreceiveprogramsdozensofkilometersaway.Itisnecessarytomakeaproperchoicewhenchoosing,butitisnotthatthehigherthegain,thebetter.

(5)Checktheinstallationeffect.Iftheimagereceivedbytheindoorcableispoor,andgoodresultscanbeobtainedwheninstallinganoutdoorantenna,youcanstillusetheindoorantennaafterusingtheamplifier.Ifafterinstallingtheantennaamplifier,theTVviewingeffectdoesnotchangesignificantly,ortheviewingeffectisworsethanbefore,itiscausedbyaninstallationerror,andyoushouldcheckitcarefullybeforecorrectingitaccordingtothecorrectinstallationmethod.

(6)Goodantennasandlightningprotectionequipment,suchasTVuserswhouseoutdoorantennas,needtoinstallanantennaamplifier,andagoodmulti-elementantennamustbeusedtocooperatewithit,andlightningprotectionequipmentmustbeinstalledtopreventLightningstrikes.

Criteriaforjudgingthemerits

First,thesignalandnoiseshouldbesmall

Second,thesensitivityshouldbehigh

Thethirdshouldbebetterinwaterresistance

Fourvolumeissmaller

Fivemetalshellisbetter

Sixpowersaving

Sevenwiringisconvenient

Well-knownbrandh2>

Overseas:Antiference,Global,Johansson,Fracarro,Fringe,Ikusi,IkusiLabgear,Maxview,Paragon,Philex,Proception,Televes,Triax,Vision,Wolsey

ButmostoftheaboveproductsaremainlyProducedinSoutheastAsia,especiallyinChina.

Domestic:Boligo,Seebest,Wanshida,Wanshibao,Jiaxun

ThesebrandsarealsotheOEMsofmanyforeignbrands,andsomeofthebrands'productqualitycanbestraightforward.Referstofirst-lineforeignbrands.

Architecturediagram

Thisillustrationtellstheuserhowtoconnectfromtheantennatotheamplifiertothepowersupplytotheuser.Butthislegendisnotclearenough.Becausetheantennaamplifierisalsocalledpreamplifier,itisbecausetheantennaamplifierisinstalledlessthan30cmbelowtheantenna,andthegeneralpowersupplywillbeinstallednexttotheTV,sothatthesignallinecanbedirectlyinsertedintotheTV.IfmultipleTVsreceiveaprogramononeantenna,thepowersupplyisgenerallyplacednearthebranchdistributor.Asforwhethertowatchhigh-definitionTVprogramsoranalogprograms,itdependsontheconfigurationofyourTV.Atpresent,mid-to-high-endflat-panelTVshavebuilt-interrestrialhigh-definitionset-topboxmodules,someofwhicharecalledall-in-ones,andthetechnologyisverymature.Comparedwithbroadcastandtelevisionsignals,terrestrialhigh-definitionprogramsarefree,andtheinitialinstallationcostisrelativelylow.Aslongasyouchoosehigh-qualityantennasandantennaamplifiers,youcanreceiveultra-high-definitionprogramsinmpg-2orevenmpg-4format.

Applicationexample

Inthisexample,themostbasicequipmentsuchasthehomeantennaamplifier7322andbranchdistributorofJohanssoninBelgiumareused.TheEuropeantestreportindicatedthatHDTVcanbereceivedinopenconditions,evenifitisonthesideofthehighway,closetothemobilebasestationorSanyin,etc.,itcanstillachieveaclearervideosignal,withidealgainandanti-interference.,Especiallyintermsofanti-mobilesignalinterference,itisworthyofrecognition.DirectTV,theworld'slargestproviderofsatelliteTVlivebroadcastsandterrestrialhigh-definitionprograms,iscooperatingwiththisbrand.

Ofcourse,therearesomedomesticbrandsthatcanachievethisquality.

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