Specifications

Maxiva ULX Series

November 11, 2013

1‐9

888‐2628‐300 WARNING:Disconnectprimarypowerpriortoservicing.

hybrid,thesecondstageatwo‐way4.77dBhybrid,andthe3rdstageisatwo‐way6dBhybrid.Theuseof

rejectloadsinconjunctionwiththehybridsallowscontinuousoperationofthePAmoduleintheeventofa

PApalletfailure.Thecombinercontainsforwardandreflecteddirectional

couplersatitsoutput.Detector

circuitsdelivertheforwardandreflectedoutputsamplestothemonitorboard,whichindicatestheforward

powerlevelindBmandusesthereflectedsignalforVSWRmonitoringandfaultprotectionforthemodule.

AnotherdirectionalcouplerprovidesanattenuatedsampleofoutputRFsignal 

toanoptionalcoaxialport

atthefrontofthePAmodule(i).

EachPAmoduleisaself‐containedtransmitterincludingthepowersupplywithitsowninternalcontrol,monitoring,

andprotection.ThemodulesreceivebasicOn/Off,Mute,&Restartcommandsfromthetransmittercontrolsystem.

ThismeansthateachmodulewillprotectitselfwithoutrelyingontheTCU.

1.2.6.1 ModuleControl

TheprimarymethodforcontrolandmonitoringofPAModulesistheindividualfiftyconductorribboncablebusthe

TCUPAInterfaceboard(s).ThesebussesarecalledDriveA(forpreampAandIPAA),DriveB(forpreampBandIPA

B),andBP1throughBP4(forPA

backplanes A5,A6,A8,andA9respectively).EachmodulecontainsaCPLDbased

monitorboardthatisresponsibleforreportingfaultsbacktotheTCUandfortakingactionwhentheON/STBY

commandisissuedbytheTCU.ThecabinetbusconnectstoeachPAand IPAmodulebackplane,it

containsthe

PA_voltage_selectline,whichsetstheDCoutputvoltageofeachoftheeightACtoDCconvertersintheIPAandPA

modules.Theoutputcanbeswitchedbetween44,46,48,or50VDC,dependingontheoperatingfrequency.

1.2.7 IPAModules(modified)

MaxivacabinetscontaintwopredrivermodulesandtwoIPAmodules.EachpredrivermoduleisdedicatedtoanIPA

moduleandtheyswitchasapair.TwotypesofULXIPAmodulesareused.

PAcabinetsthatusemorethaneightPAmodulesusestandardPAmodulesintheIPAslots.TheseIPAmodulescan

beswappedwithanyPAmoduleinthecabinet.

PAcabinetsthatuseeightPAmodulesorlessusemodifiedIPAmodules.ThesemodifiedIPAmodulescanbeused

onlyasIPAmodulesandcannotbeinstalledinPAmoduleslots.partnumbersforthemodifiedIPA modulesare971‐

0040‐011(noRFsampleport)or971‐0040‐006

(withRFsampleport)

Figure 1-8 IPA Module Simplified Block Diagram