Sharp SD-AT1000W Dokumentacja Pobierz pdf (Strona 197)

Maxiva UAX

October 17, 2013

5‐17

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

Figure 5-9 5 Station Example for Post-Filter RTAC Samples

Multiplexedco

mbiningsystemscanmakeitdifficultfortheindividualexciterstoprovideoptimaladaptivelinear

pre‐correctionduetointerferencefromothertransmittedsignalsthatarepresentonthecombinedpost‐filter

sample.Solutionsthatallowthelinearpre‐correctiontobeeffectivearecasedependentandvarydependingon

annelsandpowerlevelsbeingcombined.

5.5.3.1 RTACSetupProcedureforCombinedChannelOperation

Theprocedurethatfollowsisconservativeandwillproducegoodresultsinmostcases.Ifthepoweroutputratio

betweencombinedtransmittersisextreme,additionalactionsmayberequired.

STEP 1

Connectsamplecablefrompost‐filterin‐linecouplertoN‐waysplitterand

attachsamplecablesfromsplittertoeachexciterRTACpost‐filtersample

port.Thecablesmustbehighqualityanddoubleshielded.Anyoutside

interferenceonthecableswillaffectRTACperformance.Thesignallevelinto

eachRT

ACpost‐filtersampleportshouldbeanominal‐5dBm(totalaverage

power,measuredwithpowermeter,allchannelsoperating)foroptimal

performance.

STEP 2 Connectpre‐filterRTACsamplestakenfromadirectionalcoupleratthe

outputofeachtransmittertotheRTACpre‐filterportoneachexciter.The

cablesmustbehighqualityanddoubleshielded.Anyoutsideinterference

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