Specifications

4‐1
888‐2693‐004 WARNING:Disconnectprimarypower priortoservicing.
Copyright©2013,HarrisBroadcast
Maxiva UAX
October 17, 2013
Section-4 Theory
4
4.1 Introduction
ThissectioncontainsdetaileddescriptionsoftheMaxivaUAXSeriestransmitter,itsinternalsub‐assembliesandany
pertinentinformationregardingexternalassemblies.
Thisch
aptercontainsfivesections:
• TransmitterControlSystem
• LowPowerUnit(LPU)
• PowerAmplifierBlock(PAB)
4.1.1 ActiveLogicSymbols
Eachlogicsignalhasanactiveandinactivestateandauniquenamewithinthesystem.Todifferentiatebetween
activehighoractivelowlogicstatesontheschematics,aforwardslash(/)isplacedinfrontofanactiveLOWsignal
namesuchas/RF_MUTE.Thismeansthatifthislo
giclineispulledlow,thetransmitterRFwillbemuted.Bythe
samelogic,thesignal RF_MUTE_LED(anactivehighsignalwithnoforwardslash)willturnontheRFmuteLEDwhen
itgoeshigh.
Insomec
ases,alogicsignalmayactasatogglewithbothstatesactive,aswiththesignal/ON_OFF,whereLOW=
ONandaHIGH=OFF.IfthissignalisinverteditwouldbeON_/OFF.
4.2 TransmitterControlSystem
Figure 4-1 LPU Block Diagram
BUTTONS
LCD
SCREEN
RS-485/ILOCK
SPI
FRONT
PANEL
FPGA
FRONT PANEL SECTION
RS-485\ILOCK
RS-485\ILOCK
AMPLIFIER SECTION
AMP
CONTROL
BOARD
LOW POWER UNIT (LPU)
USER REMOTE
TX INTERFACE
MODULATOR SECTION
TX I/O
INTERFACE
SIGNAL
PROCESSING
BOARD