Sharp SD-AT1000W Especificações descarregar pdf (Página 187)

Maxiva UAX

October 17, 2013

5‐7

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

Figure 5-4 Cabinet Pre-Filter Directional Coupler

Note

Refer to Figure 5-4. Coupler and sample configurations will vary with transmitter size and configuration.

5.4.1 ForwardCalibrationOverview

Factoryforwardpoweriscalibratedat10dBbelowmodelpowerandat1dBabovemodelpower(e.g.,100Wand

1.25kWfora1.0kWdigitalsystem)toensuregoodmeteringlinearityoverthe fulloutputpowerrange.

Th

eforwardpowerreferencesampleistypicallytakenfromadirectionalcouplerbeforethemaskfilterinthe

systemandregulatesthepowerofthetransmitteroutputbeforeanyfilterlosses.

Thesy

stemforwardpowersampleistakenfromaforwardportonthepre‐filterdirectionalcoupler(showninFigure

5‐4).Theco

upledportwillhaveanattenuatorpadandassociatedcabling(andalsoatwo‐waysplitterifusedina

dualLP

Uconfiguration).TheintendedoperatingconfigurationhastheFWDsamplepadselectedsothatatfull

systemoutput(e.g.1.0kWforaUAX‐1000ATsystem,)thesample(s)attheLPUFWDinput(seeFigure5‐5)wi

llbe

approximately0dB

mafterfactoringincouplervalue,cablingloss,splitterloss(ifinstalled),andpadvalue.

Figure 5-5 LPU SYS FWD & REF Sample Inputs

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