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Section-1 Introduction

October 17, 2013

1‐4

WARNING:Disconnectprimarypower priortoservicing. 888‐2693‐004

1.5 TransmitterSystemMajorSubassemblies

UAXtransmittersfeaturesolid‐statedesignandutilizeFET‐basedpoweramplifier(PA)modulestoamplifytheRF

signal.InadditiontoRFdrivepowerfromtheLPU,thesePAmodulesutilize50VDCpowersuppliedbyswitchmode

powersupply(PS)modules.BoththePAandPSmodulesarehot‐pl

uggableandmaybeinsertedandremovedfrom

thetransmitterwhileitisontheairwithout riskofdamage.Each50VDCpowersupply feedsonePAmodule.

Note

Unplugging PA modules or PS modules that are non-redundant, such as those in the LPU, will take the

transmitter off the air.

Figure 1-1 Basic VAX Transmitter System

ThebasicUA

Xtransmitterconsistsoftwomajorsubassemblytypes:theLPU(LowPowerUnit)andthePAB(Power

AmplifierBlock)chassis.Thequantitiesofthesebasicbuildingblocksvaryaccordingtothepowerleveland

redundancydesired.ConsultTable1‐3pa

ge1‐9foralistingoftheLPUandPABquantitiesversusthetransmitter

model.

Ina

dditiontotheLPUandPABsubassemblies,aseriesofexternalRFcomponents,suchasfilters,directional

couplers,andtransmissionlines,arepresentatthetransmitteroutput.

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