Sharp SD-AT1000W Dokumentacja Pobierz pdf (Strona 23)

Maxiva UAX

October 17, 2013

1‐9

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

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

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 291 292

Sharp SD-AT1000W Dokumentacja Strona 23

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