Spectracom 2804A User manual

SPECTRACOMType2804A
GPS MASTERCLOCK
SPECTRACOM
6ABeechwood, LimeTree Way,
ChinehamBusiness Park,
Basingstoke. RG24 8WA
Tel: [phone]
Fax: [phone]
Email: [e-mail]
http://www.spectracom.co.uk
Designed and manufactured inthe U.K.

SPECTRACOMType2804A
EQUIPMENTHANDBOOK
Issue5October 2011
Configuration list
STANDARD-FITITEMS:
2xSerialRS232 duplexcontrolports(ComPort 1and 2)
6xReferenceFrequency outputs(Sine, +13dBm)
2xTiming Pulseoutputs, 1Hz/1pps, TTL
2 xTimecode outputs, userselectable(Timecode 1)
1xRemoteDisplaydriveoutput (RS422 Date/Timemessage )
1x1ppsTTLinput (TimeIntervalMeasurement etc)
1xAlarmoutput (contact)
GPS L1 C/Areceiver, 8-channelcorrelator(withbattery support forRxmemory)
230V/115Vrmsa.c. power(switchable)
1xdcinput (+24Vbattery support)/ useoptional
1xdcoutput (toSpectracomAutochangeover/Distribution Unit eg 1886)/ useoptional
OPTIONAL-FITITEMS.
Thefollowing list indicatesoptional(hardware)featuresthat maybefittedtothe2804A.
Thislist of availableoptionsiscompleteat thetimeof issueof thisManual.
OptionsS, T, G, H, L, Paremutuallyexclusivewitheachother, onlyonefromthisgroup can befitted.
Theappropriatecodelettersareappendedtothebasicunit numbertoindicatethevariant.
EXAMPLE:If a2804Abasicunitwerefittedwitha5MHz,Rubidium-Atomicreferenceoscillatorand alsothe
standardSynthesiseroption, it wouldbedesignated2804AFRS.
CODE DESCRIPTION EXCLUDES
F Referencefrequency is5MHz. (instead of standard10MHz) --
R Rubidium-AtomicReferenceoscillator(inplaceof standardQuartz). --
C 2nd Timecodechannel(Timecode2-- outputsJ13, J14) --
D Timecode-1outputsareSMPTEcode(only) --
J Auxiliary(fx)TTLoutput (Integerdivision fromFref) --
S User-SettableFrequency Synthesiser(outputsJ20, J21, J22, J23) T, G, H, L, P
T TelecommsFrequency Synthesiser(G703.10, E1orT1, Ext Ref opt) S, G, H, L, P
G 5x(additional)sineoutputsat Referencefrequency. S, T, H, L, P
H 5xsineoutputsat 5MHz(froma10MHzReferencefrequency) S, T, G, L, P
L High-SpeedParallelDataInterface S, T, G, H, P
P 5x(additional)1Hz(UTC)Timing outputs S, T, G, H, L,
CheckedJAWOct 2011 printedfrom:2804AHB5--a

CONTENTS
SPECIFICATION...........................................................................................................1
Drg. No. 3870-7329 -- Block/Wiring DiagramType 2804A.....................................................4
Drg. No. 3719-6345 dc-support (input)connector--J2............................................................6
Drg. No. 3719-6344 dcoutput/alarm-2connector--J3...........................................................8
GENERALDESCRIPTION..........................................................................................10
Drg. No. 3870-7330 -- FunctionalBlock Diagram-- 2804A...................................................12
OPERATING INSTRUCTIONS...................................................................................14
Connecting Powersources...................................................................................... 14
Statusfollowing Power-up....................................................................................... 14
MANUALOPERATION-- VIAFRONTPANEL..........................................................15
DisplayWindow....................................................................................................... 15
ControlButtons........................................................................................................ 15
The DisplayPage Sequence................................................................................... 16
The MODEpage...................................................................................................... 17
The PanelLock feature............................................................................................ 17
Drg. No.3870-7049 -- 2804ADisplayPages-- SequenceDiagram......................................18
DisplayPage -- NameList....................................................................................... 20
DisplayPage -- Characteristics............................................................................... 21
MAINMENU................................................................................................................24
Description, Initialisation and STATEPages.......................................................... 24
Description, TIMEPage.......................................................................................... 25
Description, EVENTPage ...................................................................................... 25
Description, GPS 1and GPS 2Pages.................................................................... 25
Description, FAULTPage....................................................................................... 26
SETMENU..................................................................................................................30
ManualSetting Technique....................................................................................... 30
Description, SETPage ........................................................................................... 30
Description, TIMEPage.......................................................................................... 30
Description, DSTPage........................................................................................... 31
Description, PPS Page........................................................................................... 32
Description, FREQ Page ........................................................................................ 33
Description, CODEPage........................................................................................ 33
Description, REMDPage....................................................................................... 33
Description, SER1Page and SER2Pages.......................................................... 34
Description, ALARMPage...................................................................................... 34
TESTMENU................................................................................................................38
Description, MODEPage........................................................................................ 38
Description, TESTPage......................................................................................... 38
Description, POWERPage..................................................................................... 38
Description, OSC1Page........................................................................................ 38
Description, OSC2Page........................................................................................ 40
Description, LOOPPage ........................................................................................ 40
Description, HIST1and HIST2Pages................................................................... 41
Description, HIST3Page....................................................................................... 41
Description, LEAP Page......................................................................................... 41
Description, GPSRxPage....................................................................................... 41
Description, VERSNPage...................................................................................... 41

FRONTPANELLEDINDICATORS............................................................................43
THECONTROL&MONITORING PORTS.................................................................44
J6, Com-1Port and J5, Com-2Port -- Connectivity............................................... 44
Drg. No. 2840-4228 -- Serial(RS232)Connectors................................................................46
ComPort operating modes...................................................................................... 48
StreamMode -- fixed-format output......................................................................... 49
RemoteMode Command Set................................................................................... 51
Command Summary................................................................................................ 52
2804ACOMMAND AND RESPONSE DETAIL...........................................................54
INPUTS&OUTPUTS-- REARPANELFUNCTIONALITY........................................67
ALARMOUTPUTS.....................................................................................................69
EVENTLOGGING (TIME-TAG)FACILITY.................................................................71
GPS RECEIVER&ANTENNA....................................................................................72
Acquisition............................................................................................................... 72
Antenna Installation................................................................................................. 72
Drg. No. 1008-8020 -Type 5b Antenna Installation..............................................................74
ELECTROMAGNETICCOMPATIBILITYNOTES......................................................76
Statement of Compliancefor2804A.....................................................................................78
APPENDIXA-- ANTENNAINSTALLATIONGUIDELINES.......................................80
APPENDIXB-- INSTALLATIONSOLUTIONSFORGPS DOWNLEADCABLES....83
WEEE
The equipment described inthishandbookisclassed asElectricalorElectronic
Equipment and shouldbe disposed of at the end of itsworking lifeinamannerthat
minimisesimpact on the environment and isinaccordancewithanylocalregulations.
Withinthe EU, disposalshouldbe inaccordancewiththe WasteElectricaland
ElectronicEquipment (WEEE)Directive(2003/108/EC)whichhasbeen put inplace
toencourage useof the best availablerecoveryand recycling techniquestominimise
impact on the environment and reducelandfill.
UKcustomersshouldcontactSpectracomfordisposalinstructions.Customersin
otherEUcountriesshouldcontact the importersfordisposalinstructions.
Spectracomisaregistered memberof aProducerComplianceScheme

HAZARD LIST
1. HIGHVOLTAGEPRESENTINEQUIPMENT-- PossibilityofElectricShock
Safetynotes
1(a)Beforeconnecting oroperating the unitensurethatthe supplyvoltage/sand frequency arewithin
the limitsspecified forthe equipment.
The rear-panela.c. voltage-selectorswitchmust be correctlyset before applying
a.c. powerat J1
The voltage-selectorswitchshouldnot be operated when the unit ispowered
The voltage range withthe selectorswitchinthe position marked 115 or120 is:
singlephasea.c. 99Vto132Vr.m.s.
The voltage range withthe selectorswitchinthe position marked 230 or240 is:
singlephasea.c. 198Vto264Vr.m.s.
The supplyfrequency range ineithercaseis:47Hzto63Hz
Beforeconnecting anyd.c.sourceatJ2,ensurethatthe characteristicsofthe powersource
areadequateand that the cableiscorrectlywired tothe connector.
The d.c.supplyvoltage range forRubidiumreferenceequipped units[Roption]is+22Vto
+32V. Standard[Quartzreference] unitsallowd.c. operation downto+19Vinput.
The d.c.supplyvoltage mustbe positiverelativetothe chassisof the unit; the negativepower
terminalisconnected tothe 0Vand chassis.
Check thatthe correctvalue of acfuseisfitted [asmarked on the rearpaneland defined inthe
specification section] and that the fuseiscorrectlytightened initsholder.
Check that (i)the powerlead inuseisofthe correct type.
(ii)the green/yellowearthconductorinthe powercableisconnected tosafety
earthat the source(supply) end.
(iii)the powercableconnectorisengaged withitsretainerclipatthe rearofthe
unit, toprevent accidentalpartialdisconnection.
The unit isfitted withaseparateearthing stud at itsrearpanel.
Ifthe unitisinstalled inarack withotherequipment, check thatthe earthing stud isconnected
toalocalsafetyearthpoint inthe rack, and that the rack systemitselfisalsocorrectlyearthed.
1(b)Ifafuseshouldblowduring normaloperation, it shouldbe replaced onlyonce.
Disconnect the supplybeforereplacing the fuse
Alwaysusethe correctvalue offuseasmarked on the rearpanel,and defined inthe
specification pagesofthe handbook.
Ifasecond fusefailureoccurs,the unitshouldimmediatelybe isolated fromthe itssupply
sourcesand the appropriaterepair/serviceaction scheduled.
1(c) Ifitisnecessary toremovethe unitfromitsrack mounting position,alwaysensurethatitsmains
powersupplyisswitched off atsource,and the a.c.and d.c.powerlead/sareremoved,before
commencing removalofthe unit.
1(d)Ifitisnecessary togainaccess tothe interiorofaunitforanyreason alwaysensurethatthe ac
mainssupplyisdisconnected before starting toremoveanycovers.
Alsoensurethatany(green/yellow)earthbonding wirethatmaybe connected tothe cover
plateisundamaged, and that it iscorrectlyconnected on refitment ofthe cover.

1
SPECIFICATION
TimecodeGeneratorType2804A
A.C. POWERSUPPLY :115V/ 230Vrms, (nominal)
Switchableat rearpanel. Single-phaseonly.
Powerloading :60VA maxm.,30VA typical
Voltage range :99Vto132Vwithselectorswitchin115 or120
position.
198Vto264Vrmswithselectorswitchin230 or
240 position.
Frequency range :47Hzto63Hz.
a.c. fuserating :For115Vnominaloperation:
1Aantisurge (T1A250V), 20 x5mm.
For230Vnominaloperation:
500mAantisurge (T500mA250V), 20 x5mm.
POWERCONNECTOR(a.c. input) :J13pinIECmainsconnectortoCEE22 and
BS4491
: Mating socket with2metreLSF cablesupplied.
: Colourcoding toUKstandards,
brown = Live
blue = Neutral
green/yellow= Earth
POWERCONNECTOR(d.c. input) :J27-wayprofDINsocket
Useoptional :(See Drg. No. 3719-6345)
ConnectonlytoSpectracomBattery supportunitor
equivalent protected supply, using approved cable.
Voltage range +22Vto+32Vd.c.
SIGNAL CONNECTORS
DATAINTERFACES
COM1PORT / RS232 duplexControl : J59-way'D'socket
COM2PORT / RS232 duplexControl : J69-way'D'socket
RemoteDisplayDrive/ RS422 output port :J27 BNO (mini-twinax)connector
SIGNALINTERFACES
ReferenceFrequency Outputs :J7toJ12, BNC (50ohm)
10MHz, Sine, +13dBm
Timing Outputs : J17 Output A
J18 Output B
BNC (50ohm), TTL
1Hz(squarewave)or1pps(10 microsec)
User-select fromPanelorComPort.
UTC-aligned, LEon-time.

2
SIGNAL CONNECTORS continued
SIGNALINTERFACES "
Timecode Outputs :J15 (Output A)
J16 (Output B),
BNC, 50 ohmsource
Bothconnectorscarry samecode group
User-selectable(fromPanelorComPort):
Timecode (1)=IRIG-A, IRIG-B, XR3, 2137
Default: IRIG-B
Internallink-configurableforModulated or
Unmodulated code types.
Defaults: Output A&B=Modulated (B122)
1ppsInput
Event-logging (time-tag)
J29 BNC
CMOSorTTLcompliant (+2Vthreshold)
>5kohminput impedance.
Waveforminsensitive.
ANCILLARYINTERFACES
Alarm(contact) J19, BNC
Shell insulated fromchassis/ground
Voltage-free contacts
GPS Antenna :J4, L1 signalinput, 50ohm, Ntype socket.
Connectonlytoan approved GPS
Antenna.
Connectorcarries+5Vdcsupplyto
Antenna-head LNA; do not short-circuit.
Connect/Disconnect onlywithpoweroff.
INDICATORS (front panel)
LEGEND COLOUR MEANING (when lit)
POWERAC : (green) acsupplyon
DC : (green) dcsupplyon
ALARMS
SYSTEM
RESET : (red) ProcessorWatchdog fault
DISPLAY (red) Displaymodulefault
BIT (red) Fault (any) detected byBIT
STATUS
GPS (green) GPS receiverdoing Fixes
CONTROL (green) OscillatorControloperational

3
TEMPERATURERANGE Operating :0
o
Cto+50
o
CRH 90% (non-condensing)
Storage :-40
o
Cto+70
o
C
SIZE Width :483mm
Height : 44mm
Depth :350mm excluding rearpanelconnectors.
WEIGHT 4.0kgapprox
/ excluding externalcables&connectors
FIXING POINTS :Standardrack fixing holesinfront panel.
Tapped holesinside members(See G.A. Dwg)
NOTE: When rack-mounting the 2804 unit, provide
adequateweight support byusing side brackets,
afull-widthsupport shelf/trayorroll-out runners.
DONOT 'cantilever-mount'the unitfromitsfront
panelalone.
FINISH :Parchment Whitepaint on front panelsurface.
(Semi-matt black, time-of-orderoption)
:Black legendsand lettering.
(Black panel/ Whitelegends-- time-of-order
option)
:Alocrom1000 conductivefinishon all other
surfaces.
TIMING AND FREQUENCYPERFORMANCESUMMARY
2804AWITHHI-SPECSC-QUARTZ REFERENCE(10MHz)
All performancefiguresapplyfollowing acontinuouslypowered,30-day,stabilisation period from
initialswitch-on, and assumecontinuouspowering thereafter.
Internal Reference Oscillatorperformance / instand-alone, without GPS drift-correction.
Frequency Drift (Ageing)rate, after30 daysincontinuousservice<1in10E10 / day
Short termstability(AVar, 1sec) 1in10E12
Temperaturecoefficient 0to+50oC1in10E9p-p
Temperaturecoefficient +25oC+/-10Co(typical)±3in10E10
2804AGPS drift-corrected performance / at quasi-constant temperatureinthe range 26oC ±10Co.
Frequency (10MHz)
Accuracy (24hraveraging)5in10E11 (refUSNO)
Stability(typicaldistribution, 1000 secavg. 95% probability) ±1in10E10
StandardDeviation 5in10E11
Timing (1Hz/pps)
Accuracy -- uncalibrated ±300 nanosec(refUTC-GPS)
Stability(typicaldistribution, 95% probability) ±100 nanosec
StandardDeviation 50 nanosec
2804A(Quartz) Typical Stand alonePerformance / operating without GPS, quasi-constant temp.
Frequency InitialError(refUSNO)<1in10E10
Errorat end of8hourperiod <1.5in10E10
Timing (1Hz) InitialError(refUTC-USNO)<1microsec
Errorat end of8hourperiod <4microsec

4
Drg. No. 3870-7329 -- Block/Wiring DiagramType2804A
2804A BLOCK / WIRING DIAGRAM
TMB
PLB 02 01 03
02 01 03
7329bHB
DRAWN : DATE : CHECKED : DATE :
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A Division of
This drawing and anyinformation disclosed herewith are not to be copied, used or disclosed in whole or part
without thewritten permission ofSpectracom.a division of Orolia Global Services Ltd
1311

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6
Drg. No. 3719-6345 dc-support(input)connector--J2
DC SUPPORTCONNECTOR
6345
6345
DB
PLB
3719
22 05 98
2205 98
190609B 1311
2205 98
3719
7WAYDINPROFESSIONAL
SOCKET,FACE VIEW
DC
+ve DC
- ve
CADCORELDRAW5
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3
6
1
524
Thisdrawingandanyinformation
disclosed herewitharenot tobecopied,
usedordisclosed inwholeorpart
withoutthewritten permissionof Spectracom.
adivision of OroliaGlobalServicesLtd
GlobalServicesLtd
ADivisionof

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Drg. No. 3719-6344 dcoutput/alarm-2 connector--J3
DC OUTPUT/ ALARM2
CONNECTOR
6344
6344
DB
PLB
3719
220598
22 05 98
220598
3719
1804X, 188X
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SOCKET,FACEVIEW
ALARM 2
DC
+ve DC
-ve
CADCORELDRAW 5
190609B 1311
Thisdrawingand anyinformation
disclosed herewitharenot tobe copied,
usedordisclosedinwholeorpart
without thewrittenpermissionofSpectracom.
adivision ofOroliaGlobalServicesLtd
GlobalServicesLtd
ADivision of

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GENERALDESCRIPTION
10
GENERALDESCRIPTION
The2804AisaGPS-referencedMasterClockproviding ahigh levelofTiming and Reference
Frequencyperformancealong withextensivefunctionality.
Alargenumberofpopularapplication-orientedfeaturesarestandard-fititems,and therearea
significantnumberofstandardoptions.
The2804 seriesincorporatemany ofthewell triedfeaturesofthepopularSpectracom1804 rangeof
units,and likethe1804 seriesarepackagedina19inchrack-mountcasing requiring aminimumof1U
(44mm approx.)ofrackspace.
The'depth-into-rack,excluding connectors'dimension ofa2804 isgreaterthanthe1804 by
approximately81 mm, (3.2inch)
Primarypowerisnormallydrawnfroma230Vrmssingle-phasea.c.supply,witharear-panel
voltage-selectorswitchallowing thealternativeofoperation from115Vr.m.s.
A50Hzor60Hznominalsupplyfrequencycanbeaccommodatedwithoutadjustment
Provision isalsomadeforoperation froma+24Vnominald.c.supply.Thismaybeusedina
power-supportrole,[egfroma Spectracom1811B6Batterysupportunit]orastheunit'sprimarysupply
inmobileortemporary-rigoperations.
ThefunctionalBlockdiagramisdepictedinDrawing No3870-7330 on thefollowing page.
Twodatainterfacesareavailableforusebetweenthe2804Aand theuser'ssystem;theseinterfacesare
RS232 Duplexports,designatedComPort1and ComPort2.Theconnectivityattheseports,and their
functionaldetailsaredescribedfullyinlatersections.
Useornon-useoftheComPortsisoptional;sinceonceinitiallyconfigured, theunitwill carryoutall its
primaryfunctionswithoutfurthersupportfromtheuser.
Operationalstatusand dataaredisplayedinahigh-readabilityalphanumericdisplaywindow,and a
front-panelbutton arrayisfittedtoallowmanualcontrolofsettingsand data entry.
All settableparametersmaybeenteredeitherviathefrontpanelbuttonsorbycommandssenttoeither
oftheComPorts(whentheportisinRemotemode)Thephrase'PanelorComPort'isusedinthis
handbook whenreferring tothisfacility.
Theunithascomprehensivebuilt-in-test(BIT)facilitiesthatincludestart-up tests,continualmonitoring
ofpowerrailsetc, and user-initiatedinterfaceand panelchecks.
TheReferencefrequencysignalisavailableatsixindependently-bufferedconnectorswithhigh isolation
performance, lowharmonicand spuriouscontent, and good PhaseNoise(P-N)specifications.
Individualunitverification testing isavailableifrequiredforP-Nsensitiveapplications.
The1Hz(UTC-aligned)Timing signalisavailableattwoindependently-bufferedconnectorsand these
signalscanbeuser-configured(atPanelorComPort)toprovideeither
a 1Hz(squarewave)or1pps(10 microsecond pulse)ateitherport.
Inaddition,theTiming signalcanbeconfiguredeithertostopwhenGPS lockislost,ortocontinuein
thestand-alonemode.
AdditionalstandardfeaturesincludeTimecodegeneration,Eventlogging,RemoteTime-displaydrive,
Alarmoutputetc. Thesefeaturesaredescribedindetail infollowing sectionsofthisManual.

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12
Drg. No. 3870-7330 -- Functional Block Diagram-- 2804A
TMB
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CONTACTS
CONTROLL
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FRONT PANEL DISPLAY
STATUS LEDS
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GPS
Rx ADC
DAC
SCANNER
REFERENCE
OSCILLATOR
DIVIDER
TIMECODE
GENERATOR
GPS BACKUP
BATTERY
RELAY
OPTIONAL
FEATURE
SYNTHESIZER,
OUTPUT BUFFER,
ETC.
OPTIONAL
ADDITIONAL
TIMECODE
Qz or Rb
OPTION
TTL FREQ.
OUTPUT
GPS
ANTENNA RE
G
dc
POWER
d
c
I
N
d
c
O
U
T
a
c
P
O
W
E
R
X
F
M
R
/
R
E
C
T
F
P
S
W
V
S
E
L
S
W
BIT SYSTEM
Vref
B
N
C
B
N
O
B
N
C
B
N
C
B
N
C
I
E
C
7
D
I
N
8
D
I
N
9 D
9 D
N
BNCINS.
BNC
BNC
1311
GlobalServicesLtd
A Division of
This drawing and any information disclosed herewith are not to be copied, used or disclosed in whole or part
without the written permission of Spectracom. a division of Orolia Global Services Ltd

13
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