Sharp SD-AT1000W Especificaciones descargar pdf (Pagina 143)

Maxiva UAX

October 17, 2013

3‐75

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

GPS

PowerSu

pply Green=OK,Red=fault

#Sat.De

tected ThetransmitterneedstodetectaminimumofthreesatellitesforGPSlockandpossiblerange.

SatelliteTi

me Clocktime‐of‐da y

Latitude Nyyde

greesyy.yyyminutes

Longitude Wyydeg

reesyy.yyyminutes

Altitude yyyy.yyymeter

NOTE:Ti

me,Latitude,Longitude,andAltitudeindicationsappearwhentheinternalGPSreceiverislockedtothreeormore

satellites.

Holdover

Readiness(Holdover

Readinessbargraph)

Greenifth

egraphindicates90%orhigher,redifbelow90%,andgrayifthe1PPSreferenceis

lost.

Thisin

dicatesthelockstatusoftheOCXO(OvenControlledcrystal(X)Oscillator).Ifthegraphis

Green,the10MHzOCXOPLLislockedtothe1PPSreferenceandiscapableofholdover(free

running)for24hours.Thismeansthattheoscillatorfrequencywillremainwithintoleranceand

allowtransmitteroper

ationfor24hourswithoutbeingsynchronizedtoitsreference.

OCXOHo

ldoverReadinessbargraphpercentagerepresentsthedifferencebetweenthe

maximumandminimumoscillatorcontrolvalueovera20minutewindow,andistheindication

ofhowwelldisciplinedtheoscillatoris.Iftheholdoverstatusvalueisabove90%,thenthe

oscillatorisonlychanging+/‐0.0003Hz,andisgooden

oughtouse.Thevaluewillneverreach

100%,butwhenwelldisciplinedshouldbe90%orgreater.

The10MHzOC

XOisdivideddowntoa1Hzfrequencyandlocked,viaaphaselockedloop,toa

GPS1PPS(PulsePerSecond)referencesignal.Thepurposeistocreateasynthesized1PPSsignal

whichisusedasatimingsignal,forexample,tosynchronizeasinglefrequencynetwork.The10

MHzOCXOsignalisalsousedasareferenceforthelocaloscillator,whichdeterminestheRF

outputfrequencyoftheexciter.

Thesy

nthesized1PPSsignalwillbepresentevenwhentheGPS1PPSreferenceismissing.In

thatcase,the10MHzOCXOholdoveroscillatorwillbefreerunning.

TimeR

emaining

Whenthe1PPSref

erenceislost,theOCXOHoldoverReadinessgraphturnsgray,andthe10

MHzOCXOisfreerunning.TheHoldoverTimeRemainingindicationstartstocountdownfrom

24hours.Whenitstimereacheszero,thetransmitterwillmuteifitisintheSFNmode

Whentheref

erenceisrestoredandtheoscillatorstartstolock,theOCXOHoldoverReadiness

graphindicationwillstarttoincrease.Whileitisbelow90%,thegraphisRed.Theexciter,ifin

theSFNmode,willbemuted.Whenthegraphreaches90%orhigher,itwillturnGreen,andthe

exciter,ifintheSFNmode,willunmute.

Table3‐67XmtrHome>ExciterHome>Status>PFRUStatus

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Sharp SD-AT1000W Especificaciones Pagina 143

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