Sharp SD-AT1000W Dokumentacja Pobierz pdf (Strona 144)

Section-3 Operation

October 17, 2013

3‐76

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

3.8.2 RTACStatusScreens1&2

Figure 3-70 LPU RTAC Status Screens 1 & 2

Note

(RTAC Levels pre and post-filter bargraphs) The signal level range is -20dBm to +5dBm, but, if possible,

it is better to keep the RF sample levels at -5 dBm. Since the RTAC sample levels at are usually too high,

the RTAC sample level is adjusted by adding appropriate attenuation at the exciter sample input connec

tors.

Table3‐68XmtrHome>ExciterHome>Status>RTACStatus

Field Explanation

Levels SeeNote

sonLevelsfollowingthisTable

Pre‐Fil

ter Thisisabargraphindicationwhichgivestherelativepre‐filterRTACRFsamplelevel.

Post‐Fil

ter Thisisabargraphindicationwhichgivestherelativepost‐filterRTACRFsamplelevel.

SummaryEr

ror

LinearFa

ult Green=OK,Red=HPFfeedbackinvalid

LinearRFLev

el Green=OK,Yellow=levellow,Red=levelhigh

Non‐Linea

rFault Green=OK,Red=HPAfeedbackinvalid

Non‐Linea

rRFLevel Green=OK,Yellow=levellow,Red=levelhigh

DownconverterA

ttenuation

Theam

ountofIFattenuationisgivenindB,whichshouldbegreaterthan6.5dB.Theattenuation

valuedisplayedhasaYellowbackgroundifthevalueis<6.5dBasawarningindication.

TheamountofRFattenuationisgivenindB,whichshouldbegreaterthan6.5dB.Theattenuation

valuedisplayedhasaYellowbackgroundifthevalueis<6.5dBasawarningindication.

Mode(R

TACscreen2)

Switch

Thedo

wnconvertermustSwitchbetweenthevariousRFsampleinputssothattheRTACcircuits

canproperlycorr ectforlinearandnonlineartransmitterdistortions,thechoices:

>>Automatic(Aut

o):Thisisthenormalmode.Inthismode,thedownconverterinputsampleis

automaticallyswitche d betweenPostHighPowerFilterorPreHighPowerFiltertoaccommodate

theneedsoftheRTAC(RealTimeAdaptiveCorrector)circuit.

>>Manual:Thisisatestmodeinwhichthedownconverterinputislockedtothepresentinput.

ManualSe

lect SelectionsarePost‐FilterorPre‐Filter.

DownConverter

ASta

tusreadoutofwhichinputispresentlyselectedbythedownconverter:

Post‐Fil

terorPre‐Filter.

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