Sharp SD-AT1000W Especificaciones descargar pdf (Pagina 18)

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.

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 291 292

Sin comentarios

Sharp SD-AT1000W Especificaciones Pagina 18