Specifications

Section-4 Theory
November 11, 2013
4‐22
Copyright©2013,HarrisBroadcast
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ThePAandIPA (driver)modulesareidenticalinsystemswithmorethan8PAmodules.Intransmitterswitheightor
lessPAmoduletheIPAsaremodified(simplified).ModifiedIPAmodulescannotbeinstalledinPAmoduleslotsdue
toapinontherearoftheIPAmodule(see
Figure1‐9onpage1‐10).Foradditionalinformation.blockdiagram,and
photosofPAmodulesee1.2.6onpage1‐6.Foradditionalinformation.blockdiagram,andphotosofmodifiedIPA
modulesee1.2.7onpage1‐9
AschematicorientatedblockdiagramofthePAmoduleisshowninFigure4‐13onpage4‐23.TheConnectorI/O
boardistheconnectinglinktothePAorIPAbackplaneboardforallconnectorsexceptfortheRFoutputconnector.
Seethemodulephotoin
Figure1‐7onpage1‐8toaidinIPA/PAmodulecomponentidentification.
TheRFinput,signalenterstheConnectorI/Oboardthroughtheblind‐mateconnectorJ1.ItenterstheSplitterboard
throughJ2,whereitissplitintofoursignals,whicharethedrivesignalsforthefourPApallets,A13throughA16.The
RFsignalenterseachPApalletthroughE1
andtheamplifiersignallea vesthepalletthroughE2.FromthePApallets,
thefourRFsignalsenterthecombinerboardviaports1through4.Thecombinedoutputleavesthecombinerboard
andthePAmodulethroughablindmateRFconnector.
BlindmateconnectorJ1isacombinationRFandcontrolconnector.Adiscussionoftheconnectorpinoutisincluded
inSection4.6.3.5onpage4‐27,adrawingoftheconnectorisshowninFigure4‐16onpage4‐27.
ThreephaseACpowerenterstheconnectorI/OboardatJ1pinsE1‐8throughK1‐8,thenviaTB1,TB2,andTB3to
theACdistributionboardJ10,J11,andJ12.IntheACdistributionboard,asinglephaseofthethreephasesofAC
inputpowerisappliedto
eachpowersupplyinanarrangementwhichbalancestheloadbetweenthephases.Three
phaseACin208to240voltdeltaor380to415voltwyecanbeusedinthesetransmitters .Additionalinformation
concerningthethreephaseACconnectionsisgivenin
Section4.6.3.1onpage4‐24.
EachpowersupplyprovidesaDCoutputvoltagewhichiscontrolledbythePA_Voltage_SelectsignalfromtheMCM
(maincontr o lmoduleintheTCU)viathecabinetcontrolbuspin7,see
Figure4‐14onpage4‐25forsignalpath.This
DCvoltage,onpin7ofthecabinetcontrolbus,determinestheoutputvoltageoftheeightPAmodulepower
suppliesasindicatedin
Table4‐14onpage4‐25.WithinthePAmodule,thePA_Voltage_SelectsignalpathisviaJ1‐
B5toJ2‐8ontheconnectorI/Oboard,J4‐8toJ1‐8onthesplitterboard,J1‐8toJ2‐1onthemonitorboard,J9‐1to
J1‐8throughJ8‐8ontheACdistributionboard,toJ1‐8oneachpowersupplyboard.