Specifications

Section-1 Introduction
October 17, 2013
1‐2
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1.3 UAXGeneralDescription
TheUAXseriesofsolidstate,aircooled,transmittersisdesignedtosynthesizeandamplif y radio‐frequencysignals
intheUHFbroadcastbandsIV&V(470to862MHz).
Asofthispri
nting,VAXtransmitterssupportthefollowingTVandradioformats:
ATSC=Americ
anTelevisionStandardsCommitteeDTV
ATSCA110=SinglefrequencynetworkstandardforATSC
ATSC‐M/H=MobileTVstandardforATSC
ISDB‐T=SouthAmericanandJapanesedigitalDTV
DVB‐T=DigitalVideoBroadcasting–Terrestrial
DVB‐T2=DigitalVideoBroadcasting–Terrestrial
DVB‐H=DigitalVi
deoBroadcasting–Handheld
PAL=PhaseAlternateLine,analogTVstandard
NTSC=NationalTelevisionStandardsCommittee,analogTVstandard
CMMB=Chinesemultimediastandard
CTTB(DTMB)=Chinesemultimediastandard
UAXtr
ansmittersfeatureamodular,plug‐indesign,witheachmoduleperformingadistinctfunctioninthesignal
generationoramplif icationchain.Allmodulescanbechangedeasily,asallRFandDCinterfaceshaveplug‐in
connectors.Impor tantoperationalparametersmaybeviewedonafrontpanelliquidcrystaldisplay(L
CD)with
menunavigationbuttons.Frontpanelsample/monitoringconnectorsforkeywaveformsarealsoprovided.
Thehi
ghpoweramplifiersectionsfeatureallsolid‐stateconstructionwithFET‐based(fieldeffecttransistor)RF
poweramplifiermodulesandswitchmodeDCpowersupplies.Boththepoweramplifiermodulesandtheirpower
suppliesarehot‐pluggable,allowinginsertionandremovalfromthetransmitterwithoutinterruptingtransmission.
Poweramplifiercoolingisvi
aforcedairwithmultipleinternalblowersandbuilt‐inreusableairfilters.
UAXtr
ansmittershaveaparallelremotecontrolinterfacewithconnectionsforcontrol,status,andanalog
monitoringlocatedattheLPU/exciterrearpanelorthetopoftherackcabinet,dependingonthemodeland
configuration.Theyalsoincludeaweb‐enabledGUIinterfacethatprovidescomprehensivecontrolandmonitoring
viaalo
calorremotePC.AnSNMP(SimpleNetworkManagementProtocol)agentprovideseas yintegrationwith
mostnetworkcontrolsystemsviatheInternetorLAN.
Thet
ransmitterisshippedfromthefactorywithsoftwarepreloadedandreadytorun.Ifasoftwareupdateis
availableanddesired,itcanbeeasilyupdatedusingthein‐systemprogramming(ISP)programming utilityincluded
inthewebremotebrowserinterface.
UAXtr
ansmittersaredesignedtooperatewithawiderangeofACmainsinputoptions.Thelowestpowermodels,
employingonlytheLPU/modulator,canoperateonanysingle‐phasevoltagefrom100‐240V.Thelargermodel
transmitters,featuringexternalpoweramplifier blocks,typicallyoperatewithoneofthethreefollowingACmains
arr
angements:
•Single‐phase208‐240V
•Three‐phase"delta",208‐240V
•Three‐phase"wye",360V‐415V
1.4 TransmitterModels
TheMaxivaUAXfamilyiscomposedofsevendifferentstandardmodelswithpre‐filteroutputpowersrangingfrom
10Wto2kW.Custommodelstoaccommodatespecificcustomerneedsarealsoavailable.
UA
Xtransmittermodelnumbersareformedbasedonthefollowing:
•‘U’standsforUHFBand.
•‘A’meansthatairisusedforcooling.
•‘X’indicatesthattheunitisaTVtransmitter.