Specifications

Maxiva ULX Series

November 11, 2013

4‐29

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



Figure 4-17 PA Pallet Simplified Block Diagram

4.6.3.10.1 FETBias

TheLDMOSFET’susedintheMaxivaULXpalletshavebeendesignedbythemanufacturertomaintainthefactory

biascharacteristicswithouttheneedforre‐biasinginthefield.TheidlecurrentforeachFETissetatthefactoryto

approximately1amp.VariationsbetweenFETidlecurrentsshould

belessthan10%.

4.6.4 ModuleCombiner

Themodulecombinerisacompact,watercooled,hybridcombineroptimizedtoworkacrosstheentireUHF

frequencybandfrom470MHzto860MHz.Thereareseveralcombinerconfigurationsdependingonthenumberof

PAmodulesusedinthecabinet.

Figure1‐2onpage1‐3showstwo8‐wayPAmodulecombiners(upperandlower

withonecombinerforeachhalfofthe cabinet).ThecombinerisfedbythePAmoduleoutputs.

4.7 CoolingSystem

InformationabouttheMaxivaULXcoolingsystemcanbefoundinsection1.2.9onpage1‐11andinsection2.7on

page2‐4.DetailedtheoryofoperationforthepumpmodulecanbefoundintheHEpumpmoduletechnicalmanual

888‐2625‐001Section4.

4.7.1 HeatExchanger/PumpModuleDiagrams

Figure1‐11isablockdiagramthatshowsthemajorcomponentsintheheatexchangerpumpmodulesystem.The

diagramshowsthetransmitterastheheatsourcebutdoesnotgivedetailsoftheplumbingexternaltotheheat

exchanger/pumpmodule.

Drawing843‐5607‐068(sheets1and2)showsthedimensionsandschematicdiagramofthepumpmodule.

Informationonwiringbetweenthecontrolpanelandthetransmitterseeexternalwiringdiagram843‐5601‐705.

4.8 Maxiva16ModuleTransmitterDiagrams

TheMaxivatransmitterhasmanyconfigurationsfordifferentpowerlevels.APAcabinetcanholdupto16PA

modules,andcanha veuptothreecabinets.Thissectionref erstothe16moduletransmitterwhichishousedinthe

mainPAcabinet.Whenthisconfigurationisunderstood,theothertransmitter

configurationscanbeunderstood

sincetheyaresimiliar.