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Chapter 5 Specifications Summary

Specifications and Characteristics

User Guide

5-3

1 PPS Output Characteristics

Jitter of leading edge:

< 200 nanoseconds between pulses.

Accumulated time error:

< 7 microseconds per day unlocked, for

24 hours, after one day of stabilization and 2 days of locked operation
with a fixed antenna location.

Waveform:

Pulse width 10 to 50 microseconds.

Time Accuracy:

< 1 microsecond (Locked to GPS)

Connector:

DB-25 (J3)

Front Panel Indicators (LEDs)

Power

(Z3801A has power applied)

Enabled, Active

(user-defined operation)

GPS Lock

(Z3801A is locked to GPS)

Holdover

(Z3801A is operating in holdover mode)

Alarm

(indicates an alarm condition)

Remote Interface (Port 1)

RS-422 DTE configuration:

Complete remote control and

interrogation of all instrument functions and parameters.

Baud Rate:

19200—7 data bits, 1 start bit, 1 stop bit, odd parity

(fixed configuration).

Connectors:

25-pin female rectangular D subminiature (DB-25) on

rear panel.

Antenna and Cabling Information

The 58504A Antenna Assembly is recommended to ensure specified
performance.

Power Requirements (supplied by the Z3801A):

5 Volts nominal;

50 ma maximum.

Antenna Cable:

200 feet Cables are Belden 9913 with a type N

connector one end and a type TNC connector on the other.

Summary of Contents for Z3801A

Page 2: ... 7966 from inside U S A only toll free 408 428 7907 U K Call Center 44 7000 111666 Technical Assistance 44 7000 111888 Sales Fax 408 428 7998 E mail ctac symmetricom com Internet http www symmetricom com Warning Symbols That May Be Used In This Book Instruction manual symbol the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual Indicates h...

Page 3: ...s Screen Data 1 10 Installing the Automated SatStat Program for Continual Status Updates 1 11 Operating the Automated SatStat Program 1 12 Customizing the Receiver Operation 1 13 Using Commands to Control Key Functions Examples 1 14 To Perform Basic Installation and Simple Customizing 1 14 If required restore all of the Receiver s internal settings to their factory shipment values by invoking a sy...

Page 4: ...onnecting to a Computer 2 10 Operating Concepts 2 11 General 2 11 Holdover Description 2 11 In Case of a Problem 2 12 Hours after powerup Receiver not establishing GPS lock 2 12 Receiver not maintaining GPS lock 2 13 3 Using the Receiver Status Screen Chapter Contents 3 2 Using and Reading the Receiver Status Screen 3 3 Tutorial on Using the Status Screen to Interface With the Receiver 3 4 Demonst...

Page 5: ...signments 4 15 Powerup Status Register Bit Assignments 4 16 Holdover Status Register Bit Assignments 4 16 Hardware Status Register Bit Assignments 4 17 Information that Appears in the Diagnostic Log 4 18 Model for Powerup Locked and Holdover States 4 19 Error Messages 4 21 5 Specifications Summary Specifications and Characteristics 5 2 GPS Receiver Features 5 2 10 MHz Output Characteristics 5 2 J2...

Page 6: ...Contents vi User Guide ...

Page 7: ...iver s features and functions connecting to computers and problem solving that is a section titled In Case of a Problem Chapter 3 Using the Receiver Status Screen provides information on how to use the Receiver Status screen and the SatStat program An illustrated foldout of the Receiver Status screen which is a comprehensive summary of key operation conditions and settings is provided at the end o...

Page 8: ... outputs two 10 MHz frequency outputs and an RS 422 serial interface port 10 MHz output BNC connector an Antenna N type connector Power input jack The front panel contains six Light Emitting Diode LED indicators to indicate that power has been applied Power the module has tracked and locked on to one or more GPS satellites GPS Lock the GPS system is operating in holdover mode Holdover and an error...

Page 9: ...tat Program 59551 13401 Accessories Available For more details on available GPS accessories refer to the Designing Your GPS Antenna System Configuration Guide P N 5964 9068E Refer to the subsections titled Recommended Antenna Cable Assemblies and Antenna Cable Length Delay in Chapter 2 of this guide for more cable information CV90 14807 Coaxial cables CE90 14806 Antenna GPS Receiver CE90 15275 Lig...

Page 10: ...tors attached 58519AA3 RG 213 N N Interconnect Cable Assembly 3 3 to 164 0 ft or 1 to 50 meters without connectors attached 58520AA3 LMR 4002 TNC N Antenna Cable Assembly 3 3 to 360 8 ft or 1 to 110 meters without connectors attached 58521AA3 LMR 4002 N N Interconnect Cable Assembly 3 3 to 360 8 ft or 1 to 110 meters without connectors attached 1 The 58513A is a completely assembled unit which inc...

Page 11: ...In This Guide User Guide xi Manuals Supplied Manual Z3801A User s Guide this guide P N Z3801 01 ...

Page 12: ...In This Guide xii User Guide ...

Page 13: ...1 Getting Started ...

Page 14: ...attention 4 When the GPS Lock indicator is illuminated it indicates that the Receiver is receiving the GPS signal and is locked on one or more satellite s 5 When the Holdover indicator is illuminated it indicates that the Receiver is NOT locked to the GPS signal The Receiver is keeping time based on the internal reference oscillator signal The internal reference oscillator will determine the accur...

Page 15: ...wo 1 PPS time outputs and two 10 MHz frequency outputs 5 E1 Ground stud provides a low impedance ground for safety and systems grounding WARNING Ground stud must be connected to Safety Earth Ground DC INPUT 1 4 I O CAUTION METRIC INCH HARDWARE CONSULT SERVICE MANUAL ANTENNA Port 1 10 MHz OUT WARNING BTS CV90 15357 1 19 5 30VDC J4 To avoid electric shock Do not remove covers No user serviceable par...

Page 16: ...ist you with installing your GPS antenna system refer to the following documents Information Notes that provide installation procedures for the applicable GPS antenna and accessories that you purchase The subsection titled ANTENNA Input in Chapter 2 Features and Functions of this guide To Assemble the DC Power Connector 1 Note that you will have to assemble your own dc power cable using 18 AWG con...

Page 17: ... to a proper dc power source to operate the Receiver NOTE Do not apply power to the Receiver unless a fully operational antenna system is connected to the rear panel ANTENNA J1 connector Power applied with no antenna input can initiate an extended search process that may increase time to reach GPS lock You can halt the extended search by disconnecting and reconnecting cycling the external dc suppl...

Page 18: ...8 minutes and at most 25 minutes to calculate its position from the constellation of satellites overhead The derived position will be improved over a period of time by further averaging When the GPS Lock indicator lights the basic functionality of the Receiver is available however optimal performance is delivered later To Power Up the Receiver 1 Connect the antenna system to the rear panel ANTENNA...

Page 19: ...ped with a correctly wired RS 422 serial port connector on You will need to run a terminal emulation program on your DCE device in order to communicate via the RS 422 serial port Most PCs contain a terminal emulation program especially PCs with Windows application If your PC does not contain a terminal emulation program purchase one of the following programs PROCOMM PLUS DATASTORM Technologies Inc...

Page 20: ...e DC Power Connector on page 1 4 The following sequence of events occurs after power is applied to the Receiver a Only the front panel Power indicator lights b After a moment the Receiver runs through its self test diagnostics as indicated by the flashing front panel indicators c After the self test is completed just the Power indicator remains lit If the Alarm indicator lights a failure may have ...

Page 21: ... operate the user interface application The application is easy to install and operate See the section titled Installing the Automated SatStat Program for Continual Status Updates on page 1 in this guide f When four or more satellites are tracked as will be indicated in the status screen automatic position computation is initiated g Finally the Receiver goes into steady state operation which requi...

Page 22: ...ed in Chapter 3 SYNCHRONIZATION Receiver Status Outputs Valid Reduced Accuracy ACQUISITION ELEV MASK Not Tracking 4 Locked to GPS stabilizing frequency TFOM FFOM GPS ANT DLY MODE AVG LAT AVG LON AVG HGT HEALTH MONITOR HOLD THR PRN Recovery Holdover Power up SmartClock Mode Satellite Status Tracking 5 Self Test OK Int Pwr OK Oven Pwr OK OCXO OK EFC OK GPS Rcv OK OK 1PPS TI Time 1PPS CLK Synchronize...

Page 23: ...SatStat icon that was created during the installation 5 You should establish communication with the GPS Receiver This requires connection from the DCE device Digital Communications Equipment via the rear panel I O Port 1 J3 RS 422 port using an appropriate customer supplied system interface cable Assuming you ve got the cable attached to make this connection you may want to check the settings a Se...

Page 24: ...a setting of the Receiver use the Control Query form this form will usually be stacked beneath the main form To activate this form click anywhere on it Select Control or Query then choose the type of control or query you want This will pull down a list of control or query functions that you can choose from and the corresponding command will be displayed To send the command click on Send Cmd Hence ...

Page 25: ...stomize the Receiver operation Execute a system preset if you ve found the Receiver in an unknown or questionable operating state Make the Receiver survey if it wasn t already surveying Set the antenna delay Set the elevation mask angle Set the time zone See the section titled Using Commands to Control Key Functions Examples on the following page for more information ...

Page 26: ...to the antenna power source DCE device RS 422 port and after the self test is completed you may want to complete installation using one or more of the capabilities described below If required restore all of the Receiver s internal settings to their factory shipment values by invoking a system preset After executing the system preset the Receiver will begin normal operation it will acquire GPS sign...

Page 27: ...irectly The survey is an iterative process The Receiver transits to Position Hold when a usable position has been obtained Set the Receiver to survey using command PTIME GPSYSTEM POSITION SURVEY ONCE Set the Receiver to compensate for the length of the antenna cable The Receiver can be custom configured to compensate for the length of the antenna cable The phase of the Receiver s internal clock is...

Page 28: ...w of the Sky To Bypass Position Survey Operation In order to reach steady state operation the Receiver must know the position of the antenna The Receiver is able to collect enough information from four satellites to compute this position The position survey operation takes in data from the satellites iterating until the antenna position is known to the required precision The Receiver will automati...

Page 29: ...in degrees minutes seconds longitude in degrees minutes seconds and altitude in meters above mean sea level MSL Note if you know the position to this accuracy the desired position is of the antenna rather than the Receiver NOTE For faster acquisition following repair or power failure you may want to write down the position after the Receiver has completed its survey ...

Page 30: ...Chapter 1 Getting Started Using Commands to Control Key Functions Examples 1 18 User Guide ...

Page 31: ...2 Features and Functions ...

Page 32: ...anized as follows Inputs page 2 3 ANTENNA Input page 2 3 DC INPUT J4 Power Jack page 2 6 Outputs page 2 7 10 MHz OUT J2 Output page 2 7 10 MHz Outputs via I O Port 1 J3 page 2 7 1 PPS One Pulse Per Second Outputs via I O Port 1 J3 page 2 7 RS 422 Serial Port I O Port 1 J3 page 2 8 Indicators page 2 9 Power Indicator page 2 9 Enabled Active Indicator page 2 9 Alarm Indicator page 2 9 GPS Lock Indic...

Page 33: ...n 378 feet 115 2 meters or 175 feet 53 3 meters An environmental cover that shields the antenna from wind rain and snow and a ground plane that prevents problems with reflected signals is available as the 58510A or combined in the 58513A Refer to Chapter 1 Getting Started in this guide for information on the components of the antenna system and installation instructions Recommended Antenna Cable A...

Page 34: ... and less than 360 meters 1181 feet you need 2 line amplifiers More than 360 meters 1181 feet contact sales support for assistance RG 213 Cable Line Amplifier Requirements If cable length between GPS Receiver and antenna is Less than 53 meters 174 feet no line amplifier is necessary More than 53 meters 174 feet and less than 105 meters 345 feet you need 1 line amplifier More than 105 meters 345 fe...

Page 35: ...ENCE ADELAY seconds command for the available the cable assemblies The nominal delay value is labeled on the cables Refer to the Designing Your GPS Antenna System Configuration Guide P N 5964 9068E for more information Table 2 1A Delay Values for the 58518A 519A and 58518AA 519AA RG 213 Antenna Cables Cable Option Length RG 213 or Belden 8267 Antenna Delay Value 001 3 3 ft 1m 5 0 nanoseconds 002 6...

Page 36: ...wer only See Figure 1 1 in Chapter 1 Getting Started in this guide for an illustration of the AMP Universal MATE N LOKII dc power jack Table 2 1B Delay Values for the 58520A 521A and 58520AA 521A LMR 400 Antenna Cables Cable Option Length LMR 400 Antenna Delay Value 001 3 3 ft 1m 3 9 nanoseconds 002 6 7 ft 2 m 8 0 nanoseconds 005 16 4 ft 5 m 19 6 nanoseconds 010 32 8 ft 10 m 39 3 nanoseconds 015 4...

Page 37: ... Receiver outputs two highly accurate 1 PPS time standard outputs for user specific synchronization applications Refer to Table 2 3 for signal characteristics and connector pin assignment information In the GPS locked mode the Receiver outputs a 1 PPS signal derived from the internal oscillator which is locked and traceable back to Coordinated Universal Time UTC as determined by GPS In the absence...

Page 38: ...tallation to change the Receiver s operating characteristics retrieve Receiver state information and clear the stored data The pins used are described in Table 2 3 All other pins no connection Table 2 3 Rear Panel RS 422 Serial Port 10 MHz 1PPS Pin Assignments Pin Number Input Output Description 1 Cable Shield 2 A 14 B Output Transmit Data TxD GPS Receiver output RS 422 per RS 530 3 A 16 B Input R...

Page 39: ... satellite tracking is lost or while the Receiver is powering up The principal Receiver setting that can affect this indication is manual selection of reference oscillator holdover operation Holdover Indicator The Receiver lights this indicator to show that GPS lock has been lost and the Receiver is in holdover mode It only lights it the Receiver has been locked once it will never light until the ...

Page 40: ...ied Refer to Table 2 3 for rear panel I O Port 1 J3 pin assignments and signal characteristic information The interface cable must also have the proper connector on each end and the internal wiring must be correct The GPS Receiver is considered the Data Terminal Equipment DTE for this interface The Z3801A rear panel serial interface port has a fixed configuration as described in Chapter 1 of this ...

Page 41: ... Using the Receiver Status Screen of this guide Also using the appropriate SCPI query command will provide FFOM value refer to Chapter 4 Command Listing and Status Information in this guide for specifics The Receiver is designed to automatically detect and acquire satellites in order to begin providing precise frequency and time information Until such acquisition is complete and the instrument is ...

Page 42: ...one end of Tee Measure a little less than 5 Volts from the other end of the Tee using a digital voltmeter DVM as shown in Figure 2 1 If your reading is a lot less than 5 Volts you will have to determine if the line amplifier or lightning arrester is at fault by using conventional troubleshooting isolation techniques If the line amplifier and lightning arrester are good then the antenna may be faul...

Page 43: ...Survey to obtain correct position or Correct position data using specified command SYMPTOM Position data correct Sufficient satellites in view No satellites tracked SOLUTION If candidate satellites are marked Ignore on status screen disable the feature which ignores satellites If candidate satellites are below the mask angle specified on Receiver Status screen reset the elevation mask angle Defaul...

Page 44: ...Chapter 2 Features and Functions In Case of a Problem 2 14 User Guide ...

Page 45: ...3 Using the Receiver Status Screen ...

Page 46: ...e summary of key operation conditions and settings This chapter is organized as follows Using and Reading the Receiver Status Screen page 3 3 Tutorial on Using the Status Screen to Interface With the Receiver page 3 4 Demonstration of Holdover Operation page 3 8 Receiver Status Screen Data page 3 11 SYNCHRONIZATION Section of the Status Screen page 3 12 ACQUISITION Section of the Status Screen pag...

Page 47: ...ystem interface cable and manually sending the SYSTEM STATUS query Refer to Chapter 1 Getting Started in this guide By installing and operating the SatStat program which automatically generates continual status screen updates and connecting the GPS Receiver to a PC via via the rear panel I O Port 1 J3 RS 422 port using an appropriate customer supplied system interface cable Refer to the sections t...

Page 48: ... identification number or pseudorandom noise code PRN indicates the Receiver is attempting to track it The current time and date are shown in the Time quadrant of the ACQUISITION area The default power up setting indicated by is corrected when the first satellite is tracked Since the Receiver is not tracking any satellites the GPS 1 PPS reference signal is invalid SYNCHRONIZATION Receiver Status O...

Page 49: ...ogress the Receiver has made You can now see that the Receiver is tracking several satellites as shown in Figure 3 2 The process of acquiring and tracking satellites is described in the following paragraphs Figure 3 2 Receiver Status Screen Displaying Initial Satellite Acquisition SYNCHRONIZATION Receiver Status Outputs Valid Reduced Accuracy ACQUISITION ELEV MASK Not Tracking 4 Locked to GPS stab...

Page 50: ...hours during which four satellites or more are continuously tracked Also you can see the initial estimated position has been replaced with a computed position which the Receiver continuous to refine until it gets a very accurate position The status screen indicates that a computed position is being used by displaying the averaged latitude and longitude height AVG LAT AVG LON and AVG HGT If the pos...

Page 51: ... screen These are the Time Figure of Merit TFOM and Frequency Figure of Merit FFOM indicators As shown in Figure 3 3 the TFOM is 4 and the FFOM is 1 These values will eventually decrease towards the ultimate values that represent steady state performance Refer to the subsection titled Reference Outputs on page 3 13 in this chapter for more information about TFOM and FFOM Also indicated is a predic...

Page 52: ...during this time because it is using the GPS signal to discipline the oscillator It will learn what the oscillator drift characteristics are relative to the GPS signal It will learn how the oscillator ages and the software will learn how to compensate for that aging Thus it is recommended that the Receiver is always kept locked to GPS during the first 24 hours For demonstration purposes and since ...

Page 53: ...he Receiver s outputs were maintained during holdover by the SmartClock When the GPS antenna is re connected and the GPS signal has been re acquired the Receiver has the ability to recover from holdover by itself The SYNCHRONIZATION area of the screen will show the marker pointing at the Recovery line and then eventually at the Locked to GPS line the GPS Lock LED will illuminate and the screen wil...

Page 54: ... Locked to GPS Stabilizing frequency UTC ANT DLY MODE LAT LON HGT HEALTH MONITOR Recovery Holdover Power up SmartClock Mode Satellite Status Tracking 6 Self Test OK Int Pwr OK Oven Pwr OK OCXO OK EFC OK GPS Rcv OK OK Time GPS 1PPS Synchronized to UTC Position Reference Outputs PRN 2 7 19 22 26 SS El 71 34 41 67 24 10 deg 3 1 1 000 us GPS 1PPS Valid 20 59 28 31 Jan 1996 0 ns Survey 71 4 complete N ...

Page 55: ...objective which is to produce an accurate internal 1 PPS reference signal It does so through tracking GPS satellites The HEALTH MONITOR section of the status screen summarizes the overall health of the product SYNCHRONIZATION Receiver Status Outputs Valid ACQUISITION ELEV MASK Not Tracking 1 Locked to GPS UTC ANT DLY MODE AVG LAT AVG LON AVG HGT HEALTH MONITOR PRN Recovery Holdover Power up SmartC...

Page 56: ... the frequency outputs 10 MHz are not at their final or most stable state Recovery indicates that the Receiver is actively working to become locked to GPS All conditions needed to proceed towards a lock have been met Expect an eventual spontaneous transition to a lock unless changing external conditions prevent this such as loss of tracked satellites Holdover indicates that the Receiver is waiting...

Page 57: ...ndicates that the Receiver hasn t yet achieved GPS lock or acquired satellites since it has been powered up The Receiver is measuring the internal reference oscillator s frequency and adjusting it to 10 MHz during this power up period Other queries can provide insight as to the cause if the Receiver is remaining in powerup longer than expected Reference Outputs TFOM Time Figure of Merit indicates ...

Page 58: ...ld displays the user entered time error value ACQUISITION Section of the Status Screen ACQUISITION Line The ACQUISITION line in the screen summarizes the state of the internal GPS Engine as indicated by the Tracking Not Tracking and Position areas of the screen If the Receiver Engine was considered to be synchronized to the GPS signal the GPS 1 PPS Valid message will appear at the end of the ACQUI...

Page 59: ...data Az indicates the predicted azimuth angle from a range of 0 to 359 The predicted azimuth angle is referenced to true north and is derived from the almanac indicates that the azimuth angle is unknown the almanac did not provide this data SS indicates the strength of the signal from a range of 0 to 255 A signal strength of 20 to 30 is a weak signal that may not be acquired by the Receiver Ignore...

Page 60: ...lected from a satellite in GPS Time LOCL GPS indicates GPS Time offset for the local time zone UTC indicates current time and date collected from a satellite in UTC time LOCAL indicates current time and date collected from a satellite offset from UTC for the local time zone 1PPS CLK can indicate several possible advisory messages These messages are ANT DLY antenna delay displays the user entered v...

Page 61: ...ginning of a survey 0 completion the following estimated position coordinates will be displayed INIT LAT indicates the estimated latitude North or South position of the unit in degrees minutes and seconds INIT LON indicates the estimated longitude East or West position of the unit in degrees minutes and seconds INIT HGT indicates estimated height of the unit s antenna in meters above mean sea leve...

Page 62: ...displayed when a failure or an error is detected Hardware functions are monitored periodically with the exception of Self Test which is performed at powerup or when requested The health and status indicators in the HEALTH MONITOR section are described as follows Self Test Last diagnostic check of the microprocessor system reference oscillator satellite receiver and power supplies failed Int Pwr In...

Page 63: ...Chapter 3 Using the Receiver Status Screen Receiver Status Screen Data User Guide 3 19 ...

Page 64: ...justing the frequency and phase of the oscillator to correct errors accrued while in holdover operation The phase difference between the GPS 1PPS reference and disciplined oscillator 1PPS signal is shown Holdover Reference outputs are not synchronous with GPS due to the reported condition HP SmartClock maintains timing accuracy by applying learned oscillator characteristics GPS 1PPS invalid Not tr...

Page 65: ...roportional to the signal to noise ratio of the received signal The maximum value is 255 20 to 30 is the minimum range for stable tracking Acq Locking code and carrier tracking loops to initially acquire the satellite signal Acq Demodulating the satellite broadcast NAV message and determining current time Acq Reading the satellite ephemeris orbital information from the NAV message Ignore The satel...

Page 66: ...Chapter 3 Using the Receiver Status Screen The Receiver Status Screen at a Glance 3 22 User Guide ...

Page 67: ...4 Command Listing and Status Information ...

Page 68: ... Commands page 4 3 Detailed Description of the Two Time Code Formats page 4 12 Status Information page 4 14 Standard Event Register Bit Assignments page 4 14 Questionable Status Register Bit Assignments page 4 15 Operation Status Register Bit Assignments page 4 15 Powerup Status Register Bit Assignments page 4 16 Holdover Status Register Bit Assignments page 4 16 Hardware Status Register Bit Assig...

Page 69: ... is optional Note the brackets are NOT part of the command and should NOT be sent to the Receiver 1 2 Means use either 1 or 2 numeric_value Means enter a number SENSe Means you MUST use either all the upper case letters or the entire word The lower case letters are optional For example SENS and SENSE are both valid However SEN is not valid Note SENSe is used here as an example but this convention ...

Page 70: ...ASe Erase Flash SYSTem Node Only ERRor returns INT quoted string first parameter is error number quoted string is error description LANGuage PRIMARY INSTALL Use PRIMARY to switch to normal operation commands Table 4 2 Z3801A PRIMARY Commands Keyword Syntax Parameters Responses Comments CLS Clears event status registers and error queue ESE mask value Sets or returns standard event status enable reg...

Page 71: ...mber of entries in log READ numeric send numeric returns quoted string Outputs single log entry Optional numeric parameter can be used to identify a specific log entry If no numeric is provided will output most recent log entry ROSCillator Node Only EFControl Node Only RELative returns INTEGER in Outputs EFC value in range 100 to 100 Note DIAG ROSC EFC will give same response QUERY Node Only RESPo...

Page 72: ...n Acquisition will still occur even if these commands are not used DATE yr mo day Use to speed up tracking of first satellite Not queryable TIME hr min sec Use to speed up tracking of first satellite Not queryable POSition location Use to speed up tracking of first satellite location N S deg min sec E W deg min sec elevation in m mean sea level Not queryable POSition send location SURVey LAST retu...

Page 73: ... PRNs Sends or queries list of satellites use PRN to ignore 0 means no satellites being ignored COUNt returns INTEGER Returns the number of satellites excluded from tracking INCLude INT INT one or more PRNs Sends or queries for list of satellites use PRN to include 0 means no satellites being included i e they are all on ignore list COUNt returns INTEGER Returns the number of satellites considered...

Page 74: ...on page 4 12 for complete information TINTerval returns REAL in seconds Returns the filtered GPS 1 PPS to internal oscillator 1 PPS interval Generates an error 230 Data corrupt or stale when this interval is unavailable e g if no GPS 1 PPS or no satellites available SOURce ROSCillator Node Only Note SOURCe SYNChronization is an alias for SOURCe ROSCillator HOLDover Node Only DURation returns REAL ...

Page 75: ...will cause a transition from locked to holdover TUNCertainty Node Only PREDicted returns REAL in seconds Returns an estimate of the time error that can be expected for a 1 day holdover given the current state of SmartClock learning in the Receiver PRESent returns REAL in seconds Returns the present timing uncertainty while in holdover operation WAITing returns HARDware GPS LIMit NONE Returns prior...

Page 76: ...filter value HOLDover Node Only See table in Status Information starting on page 4 14 for bit assignments CONDition returns register value ENABle mask value EVENt returns register value NTRansition filter value PTRansition filter value NTRansition filter value POWerup Node Only See table in Status Information starting on page 4 14 for bit assignments CONDition returns register value ENABle mask va...

Page 77: ...ar SET User controlled condition for questionable register When SET Alarm LED will light See Questionable register assignments below ENABle mask value ____ EVENt returns register value ____ NTRansition filter value ____ PTRansition filter value ____ SYSTem Node Only ERRor returns INT quoted string The first parameter is error number quoted string is error description LANGuage PRIMARY INSTALL Selec...

Page 78: ...he next 1 PPS pulse measures of the accuracy and stability of reference signals and service request status The syntax and content of these messages are Note that spaces are inserted here for clarity there are no embedded spaces in the actual message where see next page for description of each item in the format T1 Hxxxxxxxx t f l r v cc cr lf 19 characters excluding cr lf T2 yyyymmddhhmmss t f l r...

Page 79: ...y 6 1980 T2 format yyyymmdd is the date of the next 1 PPS pulse referenced to UTC or local time expressed in year yyyy month mm day dd format hhmmss is the time of the next 1 PPS pulse referenced to UTC or local time expressed in hour hh minute mm second ss format t is the Time Figure of Merit a measure of the accuracy of the 1 PPS pulse f is the Frequency Figure of Merit a measure of the stabilit...

Page 80: ...en Status Registers Standard Event Register Bit Assignments Powerup Holdover Hardware Operation Questionable Standard Event Status Byte Registers Service Request Enable Bit Information Reported Comments 0 Not Used ____ 1 Not Used ____ 2 Not Used ____ 3 Device dependent Error These are errors in the 3xx range or any positive numbered errors 4 Execution Error These are errors in the 2xx range 5 Comm...

Page 81: ...ll be set _ _ 1 1 1 User reported ____ 0 0 0 0 Bit Information Reported Comments P N E A 0 Powerup operation summary Summary of powerup status register 1 0 0 0 1 Locked operation Condition 1 if locked to GPS 0 otherwise 1 0 0 0 2 Holdover operation summary Summary of holdover status register 1 0 1 1 3 Position hold operation Condition 1 if in position hold mode 0 if in survey mode 1 0 0 0 4 Suffic...

Page 82: ...tellite becomes tracked following powerup 1 0 1 0 1 Oscillator oven warmed up This bit sets when the internal oscillator has warmed up following powerup 1 0 1 0 2 Date Time Valid This bit sets when first lock is attained after powerup 1 0 1 0 Bit Information Reported Comments P N E A 0 Holding Condition 1 if in holdover and holding 1 0 0 0 1 Waiting Condition 1 if in holdover and waiting to recove...

Page 83: ...0 1 1 5 Secondary oven voltage out or range Continually evaluated during normal operation Sets if detected 1 0 1 1 6 EFC voltage within 5 of limit Continually evaluated during normal operation Sets if detected 1 0 1 1 7 EFC voltage at limit Continually evaluated during normal operation Sets if detected 1 0 1 1 8 GPS 1 PPS failure Continually evaluated during normal operation Sets if detected 1 0 1...

Page 84: ...ansition into locked operation Holdover started manual Indicates transition to holdover based on user request See ROSC HOLD INITiate Holdover started GPS Indicates transition to holdover due to GPS satellite conditions e g loss of satellite or gross problem with GPS 1 PPS Holdover started TI error Indicates transition to holdover due to problem detected with Receiver ability to properly measure in...

Page 85: ...eans that the Receiver is waiting for conditions that are needed to allow the process of recovery from holdover to begin Once these conditions are met the Receiver will transition on its own to the Recovering state Recovering means that the Receiver is actively working to become locked All conditions needed to proceed toward locked have been met Expect an eventual spontaneous transition to locked ...

Page 86: ...el of Relationships Between Powerup Locked and Holdover Operation of the Receiver Holding Waiting to Recover Recovering Locked Holdover Operation ROSC HOLD INIT ROSC HOLD REC INIT ROSC HOLD INIT ROSC HOLD INIT external external conditions lock condition conditions external conditions satisfied Powerup lock condition satisfied ...

Page 87: ...r the header 112 Program mnemonic too long The header or character data element contains more than twelve characters 113 Undefined header The header is undefined For example the command HELLO 120 Numeric data error This error as well as errors 121 through 129 is generated when parsing a data element which appears to be numeric This particular error message is used when the Receiver cannot detect a...

Page 88: ...ent error occurred This error is used when the Receiver cannot detect more specific errors 221 Settings conflict Indicates that a legal program data element was parsed but cound not be executed due to the current receiver state 222 Data out of range Indicates that a legal program data element was parsed but could not be executed because the interpreted value is outside the legal range defined by t...

Page 89: ...t cannot detect the more specific errors described for errors 361 through 363 361 Parity error in program message Parity bit not correct when data received 362 Framing error in program message A stop bit was not detected when data was received 363 Input buffer overrun Software or hardware input buffer on serial port overflows with data caused by improper or nonexistent pacing 521 EEPROM failed An ...

Page 90: ...Chapter 4 Command Listing and Status Information Error Messages 4 24 User s Guide ...

Page 91: ...5 Specifications Summary ...

Page 92: ...es Six channel parallel tracking GPS engine C A Code L1 Carrier SmartClock technology Enhanced GPS technology 10 MHz Output Characteristics Frequency Accuracy 1 10 9 one day average Phase Noise J2 Waveform Sine wave 1 9 Vp p into a 50Ω load typical Source Impedance nominal 50Ω Coupling AC Connector BNC NOTE Complete product specifications are defined by Qualcomm CDMA Land Network Specification 80 ...

Page 93: ...fined operation GPS Lock Z3801A is locked to GPS Holdover Z3801A is operating in holdover mode Alarm indicates an alarm condition Remote Interface Port 1 RS 422 DTE configuration Complete remote control and interrogation of all instrument functions and parameters Baud Rate 19200 7 data bits 1 start bit 1 stop bit odd parity fixed configuration Connectors 25 pin female rectangular D subminiature DB...

Page 94: ... BTS and BSC 25 Watts nominal General Information Dimensions 127 mm Height 301 5 mm Width 345 4 mm Depth Half Rack Module Weight 3 6 kg Acceleration 2g Power 25 Watts Surge withstand Meets IEEE ANSI C37 90 C37 90 1 C37 90 2 Other Information The standard Z3801A does not include a display or a keypad While not necessary it may be convenient to track the Receiver s progress during installation and s...

Page 95: ...ireless base stations viii 2 7 chassis ground 1 3 commands 1 14 commands examples 1 14 compensating for antenna cable delay 1 15 configuration guide xi 1 4 configuration DCE device or PC 1 8 2 10 conformance SCPI 4 3 connecting a computer 2 10 connecting power 1 5 Coordinated Universal Time UTC 2 7 customer supplied RS 422 interface cable 2 10 customizing installation 1 14 customizing the Receiver...

Page 96: ...k 1 2 2 9 Holdover 1 2 2 9 Power 1 2 1 8 2 9 indicators 2 9 input antenna 2 3 POWER 2 3 2 6 Input Output I O 2 8 INSTALL Commands 4 4 installing HP_SatStat 1 11 interconnect cables x interface cable 2 10 internal reference oscillator 1 2 2 9 L latitude 1 17 LED Active 1 2 2 9 Alarm 1 2 1 8 2 9 Enabled 1 2 2 9 GPS Lock 1 2 2 9 Holdover 1 2 2 9 Power 1 2 1 8 2 9 Light Emitting Diodes viii lightning ...

Page 97: ... from Holdover 3 10 RG213 cable 2 3 RG213 cables 1 4 RS 232 cables supplied 1 4 RS 422 interface cable customer supplied 2 10 RS 422 serial port ix 1 9 2 8 RS 422 serial port specifications 5 3 RS 422 serial port configuration values 1 8 2 10 S Safety Earth Ground 1 3 sample status screen 1 10 3 11 Satellite Status 3 15 SCPI conformance 4 3 version 4 3 Self Test 3 18 serial interface 1 3 serial po...

Page 98: ...Index Index 4 User Guide wiring dc power input 1 5 ...

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Symmetricom Z3801A, User Manual

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