Specifications

Maxiva UAX
October 17, 2013
3‐75
888‐2693‐004 WARNING:Disconnectprimarypower priortoservicing.
Copyright©2013,HarrisBroadcast
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
s
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