Specifications

Maxiva UAX
October 17, 2013
1‐9
888‐2693‐004 WARNING:Disconnectprimarypower priortoservicing.
Copyright©2013,HarrisBroadcast
ThePABchassisacceptsanon‐channelRFsignalfromtheLPUandamplifiesittoahigheroutputlevelfor
transmission.Itutilizessolid‐stateFET‐basedpoweramplifiers(PA)modulestoamplifytheRFsignal.Inadditionto
RFdrivepowerfromtheLPU,thesePAmodulesutilize50VDCpow
ersuppliedbyswitchmodepowersupply(PS)
modules.BoththePAandPSmodulesarehot‐pluggable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.
ThenumberofPAandPSmodule
s,size,weight,andotherimportantparametersvaryaccordingtothetransmitter
modelanddesiredpowerlevel.
Therear
etwodifferentPABplatforms:
•2‐PAPABchassisthatisahalf‐populatedversionsofthe4‐PAchassiscapableofprovidingupto
250Wdigitalor375Wanalog(peakofsync.)RFpower(beforefilter).
•4‐PAPABchassis.Itiscapableofprovidingupto500Wdigitalor750Wanalog(peakofsync.)
RFpower(beforefi lter).
InformationonthenumberofPAandPSmo
dulesasafunctionofLPUandPABmodelsisgivenbelowinTable1‐3
page1‐9.
Note
“+ 2*” designation indicates fans at the front of the LPU, analog power levels are given in parenthesis.
1.5.3 ExternalRFComponents
AseriesofRFcomponentsmaybeinstalledafterthefinalpoweramplificationstagetocompletethetransmitter
system:
•Alowpassfilter(optional)toattenuatesignalharmonicsthatnaturallyarisefromthepower
amplificationprocess.
•Oneormoredirectionalcouplerstoprovidepre‐andpost‐filtersamplestotheRTACprecorrec‐
tionci
rcuitsandaprecisionmeanstomeasurethesystemRFpowerlevel.
•AmaskfiltertunedtotheRFchanneltoeliminateadjacentchannelintermodulationproducts
thatnaturallyarisefromthepoweramplificationprocess.
Note
The mask filter and post-filter directional coupler(s) are sometimes provided separately from the transmit-
ter.
Table1‐3PA&PSModulesforBasicModels
Configuration&Power PAModules PSModules CoolingFans
LPU10(15
W) 1 1 3+2*
LPU50W&100W(75&150) 2 2 3+2*
LPU&PA
B250W(375W) 2+2 2+2 (3+2*)+4
LPU&PA
B500W(750W) 2+4 2+4 (3+2*)+4
LPU&2PA
B1000W(1500W) 2+4+4 2+4+4 (3+2*)+4+4
LPU&4PA
B2000W(3000W) 2+4+4+4+4 2+4+4+4 (3+2*)+4+4+4+4