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Section-3 Operation

October 17, 2013

3‐32

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

3.7.3 PFRUSetup

Figure 3-33 LPU PFRU Setup Screen

Table3‐23XmtrHome>ExciterHome>Setup>PFRU

Field Explanation

Frequency(MH

z) EnterlicensedfrequencyinMHzwithdecimals.

SFNO

ffset(Hz) FieldisavailableifSFNoptionisinstalledandfunctioning.

System

ference

‐Int

ernalGPS(frominternalGPSreceiver)

‐Ext.1PPSref

erenceinput

‐Ext.10MH

zreferenceinput

‐Ma

nual(Controlof10MHzreferenceoscillatorfromtheDisciplineReferencewindow.)

The10MHzOC

XO(OvenControlledcrystal(X)Oscillator)isthereferencesourceforthe1stand2ndlocal

oscillators.Itcanbelocked,viaaPLL(PhaseLockedLoop),toanexternal1PPSsignalfromaGPSreceiver,to

anexternal10MHzreference,ortotheinternalGPSreceiver.

‐Aut

o1PPS.WhenselectedallowsseamlessswitchingbetweentheInternal1PPSandExternal1PPSandvice

versawithoutamute.Forthisfunctiontoworkcorrectlythefollowingconditionsmustbevalid:

‐Back

up1PPSmustbevalidandpresentfor60seconds.

‐Ava

lidsourceisindicatedwhenthe1PPSsignaliswithin+/‐5usoftheinternalsynthesized1PPSfor60

secondsconsecutive.

‐Cu

rrentselected1PPSsignalmustbemissingfor10consecutivesecondsbeforeaswitchtoavalidbackup

1PPSwilloccur.

‐On

ceswitchedtoabackup1PPSsourcetheexciterwillremainuntiltheprimary1PPSinputisre storedand

validfor60consecutiveseconds.

TheLPUprovidesanindicationviatheGUIfaultlogthataseamless1PPSswitchispossible.TheLPU

indicatesviathefaultlogthataseamlessswitchhasoccurred.

ReferenceLoss

Mut

‐Nomu

teonloss.

‐O

utputmutesimmediatelyuponref erenceloss.

‐O

utputmuteswhen20%ofGI(guardintervaltime)isexceeded

‐O

utputmutesafterenteredTimeOutvaluehasbeenexceeded

TimeOu

t(hours) ‐Enterintegervaluebetween1and100hours.

Discipline

ference

OCXOman

ualsettingenteredasanumber,range1to100%.

Thispr

ovidesacontrolvoltageforthe10MHzOCXOref erenceoscillatorwhenManualsettingoftheSystem

Referenceisselected.Thisvoltagereplacesthephasedetectoroutputvoltagewhichcontrolsthe10MHz

OCXOreferenceoscillatorwhenanyoftheotherReferenceSourceisselected.TheOCXOfrequency

increasesastheco

ntrolnumberisincreased.

There

lationshipbetweenthenumberenteredandthe10MHzfrequencyisasfollows:

0

≈9.9999914MHz.(Thisisnominal.1%=lower.)

50%

≈10.0000008MHz.(mid,typical)

100%

≈10.0000107MHz.(high)

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