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4‐1

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

Maxiva UAX

October 17, 2013

Section-4 Theory

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

AMPLIFIER SECTION

AMP

CONTROL

BOARD

LOW POWER UNIT (LPU)

USER REMOTE

TX INTERFACE

MODULATOR SECTION

TX I/O

INTERFACE

SIGNAL

PROCESSING

BOARD

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