Fury User Manual - Jackson Labs Technologies, Inc.
Contents
1. e aoe sa 15 3 3 2 GPS POSition s e s ere sawa sa 15 3 3 2 1 GPS POSition s s r woa w 15 3 3 2 2 GPS POSition SURVey 15 3 3 2 3 GPS POSition HOLDSURVey 15 3 3 2 4 GPS POSition LAST o 3 3 2 5 GPS POSition SURVey STATe ONCE cra mas sao 3 3 2 6 GPS POSition SURVey MAXPointS 15 3 3 2 7 GPS POSition HOLD LAST 16 3 3 3 GPS REFerence Ea a a O 3 3 3 1 GPS REFerence ADELay a oc o D e ira e e NO 3 3 3 2 GPS REFerence TRAIM 16 3 3 3 3 GPS REFerence TRAIM RSVIDs 16 3 3 3 4 GPS REFerence PULse SAWtooth 16 3 3 3 5 GPS REFerence PUlse ACCuracy 16 3 3 3 6 GPS REFerence PULse 17 3 3 4 GPS SATellite eee Ge a Pee e GR Be me CT 3 3 4 1 GPS SATellite TRACKing EMANgle bo ee OS oe eda wt ee ae Ue 3 3 4 2 GPS SATellite TRAcking COUNt 17 2012 Jackson Labs Technologies Inc 1 Fury User Manual 3 4 3 5 3 6 3 7 3 8 3 3 4 3 GPS SATellite VISible COUNt 3 3 4 4 GPS SATellite VISible COUNt 3 3 4 5 GPS POSition 3DFix 3 3 4 6 GPS GPGGA 3 3 5 GPS STATus 3 3 5 1 GPS STATus 3 3 5 2 GPS STATus O 3 3 6 GPS PTIME Subsystem 3 4 1 PTIMe2. G Under Step 3 Hex File browse for the hex file that you downloaded in step 4 6 H Go to Step 5 and press Start You will observe the firmware being downloaded to the Fury 4 7 Updating Parameters A After the download has finished remove power from the unit B Carefully pull out the PCB as described in Section 4 4 C Re adjust jumper JP3 to pins 1 2 This will allow normal operation after a power cycle reset Please note that jumper JP3 has to be in the 1 2 position moved in the direction of the adjacent faceplate in order for the unit to operate normally 2012 Jackson Labs Technologies Inc 39 Fury User Manual Jackson Labs D Close the flash programming utility and restart hyperterm E Carefully push the PCB back into the enclosure and add the screws to the enclosure being careful not to strip the enclosures threads F Press the RESET button or power cycle the unit The LED s should blink and or the ALARM LED should light up For units with LCD display verify that the LCD is in the SCPI MODE page and that the Baud rate shown in the LCD display matches the Hyperterm setting During power on the unit sends an ID string to Hyperterm The firmware version can also be queried by sending the IDN command Verify that the firmware version is the version that was downloaded 4 8 Entering the calibration parameters in case the Flash was corrupted for some reason Type the command serv
3. button under any circumstances this may erase factory calibration data and the unit will not operate and will have to be returned to the factory Pressing the erase button on the ISP utility will thus void the warranty A Open the LPC2000 utility Set the COM port in the LPC2000 application as needed on your PC B Select the Baud Rate of the LPC2000 utility to be 38400 or slower Faster Baud rates will not work properly C Press the READ DEVICE ID button this should then show LPC2136 in the DEVICE window if the unit is communicating correctly to the application Warning Make sure NOT to press the erase button under any circumstances this may erase factory calibration data and the unit will not operate and will have to be returned to the factory Pressing the erase button on the ISP utility will thus void the warranty Figure 4 4 LPC2000 Flash Utility settings f LPC2000 Flash Utility File Buffer Help LPC2000 Flash Utility V2 2 3 Flash Programming Erase Blank r Communication Filename Connected Ta Port C 8RM Fury_ GPSDO application mainFur Blank Check Entire Device com2 y C Selected Sectors We Use Baud Rate Upload to Flash R 38400 v Start Sector 0 Erase End Sect E Compare Flash Manual Heset nanan Time Out sec 2 Device j Use DTR ATS Device Masais Part ID r for Reset and Boot Loader Read XTAL Freq kHz fr 10000 Device ID Boot
4. 15000 _Stp Hide Not Tracking 1 PEN El z 15 1 40 ure 1 25 45 16 Now 2010 LT N 27 15 29 756 LON W 121 57 40 195 7 30 m MSL Lead E 3 2 o pa w N 8 69 0 ns start 17 27 41 15 11 10 UTC Send servitar y 18 02 47 15 11 10 UTC Receiver timeout a serv tar T Log Status V Log sat count Translate time codes 2584 95 6349 7 66236 0 0054106 4 072305 0 00530379 F LogEFC 2414209 Options scpi gt IV Tl to GPS 1 1E 09 0 158524 F Log PU fl F Client moc Update now D Continuously read error queue Flash LED Last error y 5 3 4 Exporting the graphics The settings which control the mode of the Export function are contained in the Options dialog Export allows you to create an image file of either the graph or the satellite map You select which you want using the radio buttons If you select Graph you have the option to export only that which is currently visible or to export the graph which is a plot of the entire logfile contents Use the checkbox All to make this choice You may nominate a size in X and Y The file format may be BMP JPG GIF or PNG Your settings will be stored and will be the default next time you open this dialog If you choose to export the graph you might want to override the TI max setting in force on the screen display You may do this by entering a non zero value into the Override Tl control A value of zero causes the export to take the same setting if
5. Right click Double left click to release everything The time span indication at the lower right of the graph will turn red to signify that mouse override is in effect Figure 5 5 Graph display gt GPSCon Utility Pro GPSCon COM8 Status Time Map Graph Export Help About 02 36 34 16 11 10 EFC 2 414181 ad 0m sd 0 04m 59 0 17 Temp 2 41396 0 13560 93 0 ns TI TT sd 11n 3 E i Sat Sort 77 0 ns o start 14 45 02 07 11 10 UTC 203 86 hrs Send serv tar De Log Status M Log sat count I Translate time codes M Log EFC 2 414181 Options Y Tlto GPS T 18 08 0 157483 M LogPu fi phentinode Continuously read error queue TF Flash LED Last error Set systime SS fi ackson Labs FireFly ll Firmware Rev 2 19 Lif f 440 D TI max ns 20 LE Fiter coeff 0 025 su jr Stop Span mins 15000 _Stop Hide Not Tracking 0 PEN El z VTC 2 36 25 16 Now 2010 LAT N 27 15 29 756 LON W 11 57 40 127 6 80 m MSL 18 02 47 15 11 10 UTC Receiver timeout 2584 95 6348 7 66236 0 0054106 4 072305 0 00530379 2012 Jackson Labs Technologies Inc J a ck S on bs Fury User Manual Figure 5 6 Expanded Graph Display 2 GPSCon Utility Pro GPSCon COM8 ada Sure re Map J Graph Export Help RE E Jackson Labs FireFly 1 Firmware Rev 2 19 PEA A Ss Lite 441 02 30 51 18 11410 EFC 2 414208 ad 0m sd 0 05m I TI max ns 20 H ANITA 155 emp Fiter coeff 0025 e r Span mins
6. 3 Use of the mouse in graph mode 45 5 3 4 Exporting the graphics 47 5 4 Interpreting the Data 48 Performance 49 6 1 Introduction 49 6 2 Performance Parameters 49 6 2 1 Allan Variance and Deviation 49 6 2 2 51 6 3 Conclusions 51 111 Fury User Manual Jackson abs 7 Certification and Warranty 53 TA Certification 2 goa A de amp eee pue OS 7 1 1 Warranty e 9 7 1 2 Limitation of Warranty BB 7 1 3 Exclusive Remedies DA iv 2012 Jackson Labs Technologies Inc J a ck S onj Fury User Manual Labs introduction 1 1 Overview The Fury GPSDO includes a Motorola M12 or M12M GPS receiver a 32bit processor that runs a Real Time OS LCD and Keypad interfaces CMOS and Sine Wave 10MHz outputs 1PPS output RS 232 control interface precision voltage references and DACs Fury can be configured via the RS 232 control port to support both positive and negative EFC control 1 2 General Safety Precautions The following general safety precautions must be observed during all phases of operation of this instrument Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument Jackson Labs Technologies Inc assumes no liability for the customer s failure
7. ADEL parameter results in the unit slowly locking to the new UTC phase offset Using the SERV 1PPS command results in immediate phase change of the 1PPS signal at the expense of a lower resolution of only 16 7ns versus Ins This command has the following format SERVo 1PPSoffset lt int gt ns 3 9 10 SERVo QUIet This command minimizes the output spurs by shutting down the LEDs and RS 232 transceiver The LCD display must be set to any other mode than SCPI MODE for quiet mode to be fully activated If SCPI mode is set quiet mode will be disabled This command has the following format SERVo QUIet lt ON OFF gt 3 9 11 SERVo TRACe This command sets the period in seconds for the debug trace Debug trace data can be used with Ulrich Bangert s Plotter utility to show UTC tracking versus time etc This command has the following format SERVo TRACe lt int gt 0 255 3 9 12 SERVo This command returns the result of the following queries SERVo COARSeDac SERVo DACGain SERVo EFCScale SERVo EFCDamping SERVo SLOPe SERVo TEMPCOmpensation SERVo A GINGcompensation SERVo PHASECOrrection SERVo 1PPSoffset SERVo TRACe 2012 Jackson Labs Technologies Inc 29 Fury User Manual Jackson 30 O 2012 Jackson Labs Technologies Inc J a ck S onj Fury User Manual Labs Firmware Upgrade Instructions 4 1 Introduction The following is a short tutorial on how to upgrade the Fury GPSDO firmware Please f
8. Camiage retum is 2nd port error prompt E7 HH gt lt SPC gt lt CR gt Linefeed is lt LF gt Aux request string meas curent lt CR gt M Log Auxl or Log Max SS Aux2 request string DATA El lt CR gt Log Aux2 or Log Min SS Aux3 request string DATA E47 lt CR gt T Log Aux3 m Traces to be visible on the graph M EFC Label F TI M An focxo cur f1 Max filter Fit coeff 1023 Mag Hold Offset Min fo E jo m 1005 F PU JE Au 1023 fo a fo 1023 m 1005 fo r 0 05 0 F sas D Ana fi jo 1023 5 3 1 3 Other options The other tabs in the options window can be selected and you can set whatever options you need such as paths for logging or exporting graphics 5 3 2 Sending manual commands to the receiver You can send SCPI commands manually by using the drop down box under the display window as shown in Figure 5 4 Care must be taken when sending these commands so be sure that the command that you select is supported by the Fury GPSDO Once you ve selected the command you can press Send to send it to the Fury 44 O 2012 Jackson Labs Technologies Inc J a C k S on bs Fury User Manual Figure 5 4 Sending manual commands GPSCon Utility Pro GPSCon COM Status Time Map Graph Export Help About MdmLabs Firmware Rev 2 19 Life fr Not Tracking 3 Stat IM PRN El Az EI 15 2 147 Stop 18 7 261 z 26 4118 _tide_ UTC 22 56 52 28 Oct 2010 LAT N 37 16 52 3
9. Fury User Manual Jackson Labs Figure 2 3 Antenna connector and configuration jumpers JA CKSON LABS FURY DOCXO Jrs H 2801002030 y 4 2 S GPS AR E 1 AutoSurvey ss gs El Jumper ntenna k 33V 5V My Reset ma Selector Button E ES Dr E 2 1 4 Initiating Auto Survey mode Use the Auto Survey jumper see Figure 2 3 only after applying power to the unit Momentarily set the jumper to the position closest to the GPS receiver can until the right most LED LOCK LED starts blinking at Hz to indicate the unit is in Auto Survey mode Do not forget to remove this jumper once the LOCK LED starts blinking If the Jumper is accidentally left in the Auto Survey position during power on the unit will not boot up The unit will need about 3 hours to one night to do auto survey to establish its new GPS position Auto Survey can be started by using the Auto Survey jumper JP10 by sending an SCPI command or by connecting a keypad and pressing the button for 10 seconds Auto survey is active as long as the lock LED blinks at 1 2Hz Auto Survey mode can be queried with the GPS command Survey State 1 will indicate Auto Survey to be active Enter GPS POS SURV STAT ONCE to start Auto Survey mode manually 6 2012 Jackson Labs Technologies Inc Ja ck S on a bs Fury User Manual You may also enter the length of the Auto Survey in seconds before initiating an Auto Survey with t
10. Jackson Labs Technologies Inc Ja C K S on Fury User Manual Labs 3 8 1 3 SYSTem COMMunicate SERial BAUD 26 3 8 2 SYSTem STATus 26 3 8 3 SYSTem ad ONCE 26 3 9 SERVO Subsystem 26 3 9 1 SERVo COARSeDac 27 3 9 2 SERVo DACGain nn HAS ay oe A ae 27 3 9 3 A A in A SERVO EFCScale28 3 9 4 SERVO EFCDamping 28 3 9 5 SERVo SLOPe 28 3 9 6 SERVo TEMPCOmpensation 28 3 9 7 SERVo AGINGcompensation 28 3 9 8 SERVo PHASECOrrection 28 3 9 9 SERVo 1PPSoffset 29 3 9 10SERVo QUIet 29 3 9 11SERVo TRACe 29 3 9 12SERVo 29 4 Firmware Upgrade Instructions 31 4 1 Introduction f 31 4 2 Recording Factory Calibration data 23 31 4 3 Preparing the Desktop Unit for software installation 32 4 4 Putting the PCB into In Circuit Fea wen mode 33 4 5 ISP Flash Loader Utility installation f 34 4 5 1 Philips LPC2000 Flash Utility 34 4 5 2 Flash Magic Flash ls Utility 34 4 6 Downloading the firmware 34 4 6 1 Philips LPC2000 Flash Utility A 34 4 6 2 Flash Magic Flash ous Utility 36 4 7 Updating Parameters 39 4 8 Entering the calibration parameters i in case the Flash was s corrupted for some reason 40 GPSCon Utility At 5 1 Description 41 5 2 Installation 41 5 3 Ba GPSCon i 41 5 3 1 Setting the options 41 5 3 1 1 Communication Parameters 42 5 3 1 2 Auxiliary parameters 42 5 3 1 3 Other options 44 5 3 2 Sending manual commands to the receiver 44 5 3
11. This group of commands facilitates the initial tracking It allows the user to give the receiver an initial estimate of the current time and date and position If the receiver is tracking already at least one satellite the receiver will ignore any attempt to change the date or time If the receiver is computing a 3D Fix it will ignore any attempt to change its currently calculated position 3 3 1 1 GPS INITial DATE This command is used to enter the date This command has the following format GPS INITial DATE lt yyyy mm dd gt 3 3 1 2 GPS INITial TIME This command is used to enter an initial time This command has the following format 14 2012 Jackson Labs Technologies Inc Ja ck S onj Fury User Manual Labs GPS INITial TIME lt hour min sec gt 3 3 1 3 GPS INITial POSition This command is used to enter an estimate of the position This command has the following format GPS INITial POSition lt N S gt lt deg min sec gt lt E W gt lt deg min sec gt lt height gt 3 3 2 GPS POSition This group of commands deals with the position of the GPS antenna 3 3 2 1 GPS POSition This command specifies the position of the GPS antenna The format of this command is the following GPS POSition lt N S gt lt deg min sec gt lt E W gt lt deg min sec gt lt height in meters gt This command specifies the position of the GPS antenna That position will become the LAST HOLD position To actually activate that positi
12. any as the screen display The export may be done automatically on a timed basis Simply enter a non zero value in seconds to choose an export time interval To manually export in accordance with the settings press the Export button O 2012 Jackson Labs Technologies Inc 47 Fury User Manual Jackson Labs 5 4 Interpreting the Data Figure 5 5 shows the data acquired by the Fury unit over a period of more than 200 hours The red trace is EFC crystal frequency control voltage The crystal is aging becoming faster in frequency over time This requires the control voltage to be lowered to maintain 10 0MHz exactly A drift of 2mV is visible over 200 hours On the left side of the screen the EFC range over this 200 hour plot is displayed vertically as 0 00193V This means the drift of the EFC voltage due to aging is 88mV per year The EFC sensitivity of the crystal is about 8Hz per volt so the crystal ages at 8Hz V 0 088V Year 0 704Hz Year drift At 10MHz 0 704Hz 10MHz 7 04E 08 aging rate per year This is the same as 0 2ppb drift due to aging per day This crystal aging is fully compensated by the firmware with and without GPS reception of course The OCXO heater current is shown in turqoise We can see it ranges from 0 135607A to 0 178146A The OCXO current jumps lower every 24 hours because the unit is sitting next to a window and the sun shines onto the OCXO in the evenings heating it up and thus making the unit use lo
13. are 15 0 for OCXOs with 20Hz deviation and 150 0 for OCXOs with 2Hz deviation This command has the following format SERVo DACGain lt int gt 0 1 10000 THIS VALUE NEEDS TO BE ADJUSTED TO MATCH THE PARTICULAR OCXO YOU ARE USING WITH THE FURY GPSDO Use the following approximate guidelines to adjust DAC GAIN MAX OCXO Recommended DAC GAIN Examples Frequency setting Deviation 0 2Hz 2000 to 5000 Rubidium 2Hz 250 0 10811 20Hz 30 0 Typical OCXO 40 Hz 15 0 MTI OCXO O 2012 Jackson Labs Technologies Inc 27 Fury User Manual Jackson 3 9 3 SERVo EFCScale Controls the Proportional part of the PID loop Typical values are 0 7 double oven OCXO to 6 0 simple single oven OCXO Larger values increase the loop control at the expense of increased noise while locked Setting this value too high can cause loop instabilities This command has the following format SERVo EFCScale lt float gt 0 0 500 0 3 9 4 SERVo EFCDamping Sets the Low Pass filter effectiveness of the DAC Values from 2 0 to 50 are typically used Larger values result in less noise at the expense of phase delay This command has the following format SERVo EFCDamping lt float gt 0 0 4000 0 3 9 5 SERVo SLOPe The parameter determines the sign of the slope between the EFC and the frequency variation of the OCXO This parameter should be set to match your OCXOs EFC frequency slope This command has the following f
14. computer if you experience problems such as the download breaking up in the middle of the transfer Or alternatively you may use the Flash Magic programming tool Please ensure that you have at least version 2 2 3 of the LPC2100 flash utility installed Earlier versions may not recognize the LPC2136 processor used on the Fury boards 4 5 2 Flash Magic Flash Programming Utility The second utility is the Flash Magic tool available on the Flash Magic website http www flashmagictool com If the Philips LPC2000 tool doesn t work please use this one 4 6 Downloading the firmware Download the latest version of Fury firmware from the Jackson Labs Technologies Inc support website and store it in a place that will be remembered The file is in hex format The unit needs to be connected to the computer s RS 232 serial port prior to firmware download Connect a DB 9 serial connector to the Fury serial port P1 4 6 1 Philips LPC2000 Flash Utility A Open the LPC2000 utility Set the COM port in the LPC2000 application as needed on your PC B Select the Baud Rate of the LPC2000 utility to be 38400 or slower Faster Baud rates will not work properly 34 2012 Jackson Labs Technologies Inc Ja ck S on a bs Fury User Manual C Press the READ DEVICE ID button this should then show LPC2136 in the DEVICE window if the unit is communicating correctly to the application Warning Make sure NOT to press the erase
15. indicating the difference between the internal 1PPS generated by the OCXO and the GPS generated 1PPS This command is useful to measure the OCXO drift when in holdover Please note that the Time Interval Counter is limited to 2000ns display range The time interval difference may be displayed with the SYNC command 2012 Jackson Labs Technologies Inc 23 Fury User Manual Jackson 3 5 12 SYNChronization HOLDover RECovery INITiate This command terminates a manual holdover that was initiated with the SYNC HOLD INIT command and return the unit to normal GPS locking mode 3 5 13 SYNChronization TINTerval This query returns the difference or timing shift between the Fury 1 PPS and the GPS 1 PPS signals The resolution is 1E 10 seconds 3 5 14 SYNChronization IMMEdiate This command initiates a near instantaneous alignment of the GPS 1 PPS and Receiver output 1 PPS To be effective this command has to be issued while not in holdover 3 5 15 SYNChronization FEEstimate This query returns the Frequency Error Estimate similar to the Allan Variance using a 1000s measurement interval and comparing the internal 1PPS to GPS 1PPS offset Values less than 1E 012 are below the noise floor and are not significant 3 5 16 SYNChronization LOCKed This query returns the lock state O OFF 1 ON of the PLL controlling the OCXO 3 5 17 SYNChronization This query returns the results of these six queries SYNChronization SOURce M
16. to comply with these requirements 1 2 1 Grounding To avoid damaging the sensitive electronic components in the Fury GSPDO always make sure to discharge any built up electrostatic charge to a good ground source such as power supply ground This should be done before handling the circuit board or anything connected to it i e the GPS antenna 1 2 2 Power Connections Make sure to connect the DC power to the device following the polarity indicated in Section 2 1 Do not reverse the power pins as this will cause serious damage to the circuit board 1 2 3 Environmental Conditions This instrument is intended for indoor use It is designed to operate at a maximum relative non condensing humidity of 95 and at altitudes of up to 4000 meters Refer to the specifications tables for the ac mains voltage requirements and ambient operating temperature range O 2012 Jackson Labs Technologies Inc 1 Fury User Manual Jackson 2 O 2012 Jackson Labs Technologies Inc Ja C k S on a bs Fury User Manual Quick Start Instructions 2 1 Powering Up the Unit 2 1 1 Power Supply Requirements The Fury GPSDO requires 11 0 14 0V DC source capable of supplying 0 45A steady state During the OCXO warm up phase the current could rise to 0 8A The rise time from 0 to 9V should be less than 10ms Most switching power supplies are faster than that but a linear power supply may not satisfy this requirement If the rise time is less than 10ms the
17. unit may not power up correctly If this happens it is possible to reboot the unit by pressing the Reset button after power up See Figure 2 2 to locate the Reset button The small green power connector has its positive side toward the BNC connector The current is typically 0 45A steady state with internal DOCXO Connect a clean 12V power source to the green connector block as shown in Figure 2 1 Figure 2 1 Power supply connections 2012 Jackson Labs Technologies Inc 3 Fury User Manual Jackson Labs Warning Do not reverse the polarity of the power connector The Fury board is protected against reverse polarity by a diode Although the Fury won t be damaged it could damage the power supply by short circuiting it 2 1 2 Major connections The major connections and features of the Fury PCB are shown in Figure 2 2 Figure 2 2 Major connections and features of the Fury board LABS JA CKSON FURY DOCXO 801002030 5 RTE The following table shows the Fury revision 2 0 hardware connectors Ref Name Function Specification Pinning J4 Sine Out Sine Wave Out 10 0MHz 7dBm 3dBm 3 Sine 2 GND 1 GND 500hms End Terminate 4 O 2012 Jackson Labs Technologies Inc Jackson 7 Fury User Manual J6 CMOS Out TTL CMOS Out 3 3V 5Vpp 500hms Do Not 1 Digital Output 2 GND Terminate JP8 J6 Output Select J6 3 3V or 5Vpp Jumper 3 2 J6 is 5Vp
18. 97 LON Y 121 59 15 645 74 18 m MSL OcxO Current OK GPS Receiver Status 3D Fix APPS SOURCE MODE GPS 1PPS SOURCE STATE GPS GPSDO Status Locked Send i 22 39 10 28 10 10 UTC Receiver timeout F zi 22 39 20 28 10 10 UTC Receiver timeout MIE ew reed OMR L4 22 39 29 28 10 10 UTC Receiver timeout F DIAG ROSC EFC ABS a 22 39 39 28 10 10 UTC Receiver timeout O iam HUB DEERE 22 39 48 28 10 10 UTC Receiver timeout F Tltol DIAG TEMP 22 39 58 28 10 10 UTC Receiver timeout DIAG TEST RES 22 40 07 28 10 10 UTC Receiver timeout IV Logh i 2 A 22 40 23 28 10 10 UTC Receiver timeout DT 22 42 17 28 10 10 UTC Receiver timeout F Conti GPS INIT D TE pr mo day A Fees los GPS INIT POS N deg min sec w deg min sec elev Last error e 5 3 3 Use of the mouse in graph mode Refer to Figure 5 5 for the following description In graph mode the span of the graph may be set using the span setting Alternatively the start and or stop time of the graph may be locked using the mouse Set the start time by left clicking on the desired start point If you wish the stop time may also be locked by right clicking the desired stop point This can all be unlocked by left double clicking anywhere on the graph Double click always causes all of the selected span data to be displayed At the next update cycle the selected span if not set to zero will be enforced However the left click and if chosen the right c
19. CXO SLOPE NEGATIVE TEMPERATURE COMPENSATION 262 00 AGING COMPENSATION 0 00554 PHASE CORRECTION 25 000000 1PPS OFFSET 0 ns TRACE 0 PLEASE NOTE THAT THE ABOVE VALUES ARE REPRESENTATIVE AND SHOULD NOT BE ENTERED INTO YOUR FURY UNIT Note down the Coarse DAC EFC Scale EFC damping OCXO slope Temperature compensation this value is quite important and varies from unit to unit aging compensation and Phase correction parameters so these can be typed in later in case these original values are lost for some reason 4 3 Preparing the Desktop Unit for software installation In order to upgrade the Fury firmware the desktop enclosure has to be opened First and most importantly disconnect the Fury unit from AC mains power or from any other power source you may have connected Carefully remove the four screws on the faceplate side with BNC connectors only of the Fury units as shown in the following picture Please note not to tighten the screws too much when re assembling the unit the screws may very easily strip the aluminum enclosure s threads Remove the four screws indicated by the red arrows in Figure 4 2 32 O 2012 Jackson Labs Technologies Inc J a ck S onj Fury User Manual Labs Figure 4 2 Fury faceplate removal 4 4 Putting the PCB into In Circuit Programming ISP mode After removing the four screws as described in the previous section carefully pull out the faceplate to about 1 inch in lengt
20. D is connected to connector JP2 2012 Jackson Labs Technologies Inc 7 Fury User Manual Jackson 2 1 5 1 LCD Contrast The LCD contrast will likely need to be adjusted with the small blue Potentiometer next to the LCD connector Use a small screwdriver to carefully turn the pot 10 turn pot until you see characters clearly on the LCD display 2 1 6 Menu switch Keypad A single button momentary short switch can be connected to pins 5 and 6 of connector JP1 white connector next to LCD connector Pressing this button will cycle the LCD through its various status pages The only data input that is done with the single switch is setting the unit into Auto Survey mode by holding down the switch for 10 seconds All other settings are done via the SCPI interface which is more or less HP Symmetricom 58503A compliant PLEASE NOTE THAT THE UNIT HAS TO BE SET TO SCPI MODE ON THE LCD FOR THE SERIAL PORT TO WORK AND ACCEPT COMMANDS SCPI MODE IS ENABLED BY DEFAULT WHEN THE UNIT IS SHIPPED FROM THE FACTORY WHEN NOT IN SCPI MODE THE RS 232 BUFFER IS DISABLED THE REASON FOR THIS IS THAT THE RS 232 BUFFER COULD 8 O 2012 Jackson Labs Technologies Inc J a ck S on bs Fury User Manual INTRODUCE SOME SWITCHING NOISE ONTO THE OUTPUTS OR ONTO THE 12V POWER SUPPLY THE DC DC SWITCHING REGULATOR IS DISABLED IN ORDER TO ALLOW THE MOST QUIET OPERATION POSSIBLE 2 1 7 External 1PPS input option Beginning with firmware ver
21. Fury User Manual SOP 7 luosyoer Fury User Manual Copyright 2010 2011 2012 Jackson Labs Technologies Inc Ja ck S on a bs Fury User Manual 1 Introduction 1 1 1 Overview 1 1 2 General Safety Precautions 1 1 2 1 Grounding 1 1 2 2 Power Connections 1 1 2 3 Environmental Conditions 1 2 Quick Start Instructions 3 2 1 Powering Up the Unit f 3 2 1 1 Power Supply Requirements 3 2 1 2 Major connections 4 2 1 3 Connecting the GPS Antenna 5 2 1 4 Initiating Auto Survey mode 6 2 1 4 1 Backup Battery 7 2 1 5 Connecting an LCD Display 7 2 1 5 1 LCD Contrast 8 2 1 6 Menu switch Keypad 8 2 1 7 External 1PPS input option oo A a AA A 2 2 Remote serial control 2 2 1 Help and command overview 1 2 2 2 Loop parameter adjustment 11 3 SCPI Control Quick Start Instructions 13 3 1 Introduction yt G e a ee ae Re ee RO 3 2 General SCPI Commands be Sy ae a Pe ee oe Se es a al 3 201 IDN 52 cee gs Oe we he we NN we ee eh ee Eo ae wm a 322 HELP 446 laca Oo wr Oe a eo me A a a TS 3 3 GPS Subsystem a 1 13 3 3 1 GPS INITial Seon Boe oe ee a ds ant A 3 3 1 1 GPS INITial DATE PR ch tots We anh ee ere oh ee ee ot I 3 3 1 2 GPS INITial TIME 14 3 3 1 3 GPS INITial POSition o s a e
22. GPGGA FIRMWARE REVISION 1 22 AND LATER UPDATE Beginning with FW rev 1 22 the GPGGA command will actually generate both the NMEA GGA as well as the RMC output command The NMEA RMC string generates additional information such as the Date and is thus quite useful The GPS GPGGA command will enable or disable the GGA and RMC strings at the same time there is no method to generate either one or the other string separately Please contact the factory or download legacy firmware revision 1 21 available on the Jackson Labs Technologies Inc website under the support tab if you require the system not to generate the RMC string 2012 Jackson Labs Technologies Inc 17 Fury User Manual Jackson ls This command instructs the Fury to send the NMEA standard strings GPGGA and GPRMC every N seconds with N in the interval 0 255 The output is not valid during the initial 12 minute OCXO warmup phase and during the initial GPS Auto Survey phase This command has the following format GPS GPGGA lt int gt 0 255 3 3 5 GPS STATus This subgroup of queries will display the status of the GPS receiver as described in the Motorola M12 GPS Receiver User Guide 3 3 5 1 GPS STATus The query returns a 16 bit decimal number with the following description 18 Bit15 13 111 3D Fix 110 2D Fix 101 Propagate Mode 100 Position Hold 011 Acquiring Satellites 010 Bad Geometry 001 Reserved 000 Reserved Bit 12 11 Reserved Bit 10 Narro
23. Inc typically uses values between 10 to 50 Setting this value too high may cause loop instability Phase compensation This is the Integral part of the PID loop This corrects phase offsets Set higher values for tighter phase following at the expense of frequency stability Typical values range from 4 30 25 being the default Setting this value too high may cause loop instability A well compensated unit will show performance similar to the plot in Figure 2 6 when experiencing small perturbations Figure 2 6 Fury phase compensation plot TI av 1 03n sd 4 7 n 16 67 hrs 2012 Jackson Labs Technologies Inc J a ck S onj Fury User Manual Labs SCPI Control Quick Start Instructions 3 1 Introduction The SCPI Standard Commands for Programmable Instrumentation subsystem is accessed via the RS 232 connector using a DB 9 Null Modem cable and a terminal program By default the terminal settings are 115200 8N 1 There are a number of commands that can be used as listed below Most of these are identical to Symmetricom 58503A commands To get a listing of the available commands send the HELP query This will return a list of all the available commands for the Fury GPSDO Additional information regarding the SCPI protocol syntax can be found on the following web site http www scpiconsortium org Please refer to the document SCPI 99 pdf for details regarding individual SCPI command definitions A basic famil
24. Loader ID Selection Please note that the Use Baud Rate setting needs to be set to 38400 Baud or less it will not work faster than 38400 Baud The DEVICE should show up as LPC2136 after pressing READ DEVICE ID Also please point the Filename to the directory where you have stored the latest firmware hex file that is to be downloaded D Start the download by pressing Upload to Flash button The following window should appear if the correct COM port has been chosen etc O 2012 Jackson Labs Technologies Inc 35 Fury User Manual Jackson ls Figure 4 5 Starting the download with the LPC2000 Flash Utility E LPC2000 Flash Utility File Buffer Help LPC2000 Flash Utility V2 2 3 y Erase Blank gt y Communication Filename Connected To Port c SARMiFury_GPSDO ApplicationimainFur Blank Check Entire Device COM1 X Selected Sectors Use Baud Rate Upload to Flash These ces SOE c Fare Start Sector D Fins z rase iz r Compare Flash Janual Rese End Sector ss Time Out sec 2 Flash Programming Use DTR RTS Device Device pr 4 for Reset and LPc2106 a Past iD T Boot Loader XTAL Freq kHz 10000 Device ID Boot Loader ID Selection Fislinisad Fi LPC2000 Flash Utility Reset Message Please reset your LPC2000 board now and then press OK OK Press the OK button and the download should start Sometimes the util
25. NECESSARY UNDER NORMAL CIRCUMSTANCES e All loop parameters can be controlled via the RS 232 serial port The commands to control the loop parameters are part of the servo command See also the SERVO Subsystem section below The individual commands are DAC Gain this parameter adjusts the Fury control loop to the EFC versus Frequency gain of your OCXO Some experimentation may be required to find the optimum DAC Gain for your particular OCXO For typical OCXOs the EFC gain of the OCXO can vary from 1Hz to 20Hz for a OV to 5V EFC swing HP 10811 units for example may have 2Hz for a full OV to SV swing Use the following approximate guidelines to adjust DAC GAIN MAX OCXO Recommended DAC Examples Frequency Deviation GAIN setting 0 2Hz 2000 0 Rubidium 2Hz 250 0 10811 20Hz 30 0 Typical OCXO 40Hz 15 0 MTI OCXO EFC Scale this is the proportional gain of the PID loop Higher values will give quicker convergence and faster locking of the GPS time lower loop time constant lower values give less noise Values between 0 7 good double oven OCXO and 6 0 simple single oven OCXO are typical 2012 Jackson Labs Technologies Inc 11 Fury User Manual Jackson 12 21 29 17 10 07 EFC 2 409962 ad 0m sd 0 07 m 83 Current 4 2 4099 0 075127 28 0 ns EFC Damping overall IIR filter time constant Higher values increase loop time constant Jackson Labs Technologies
26. ODE SYNChronization SOURce STATE SYNChronization LOCKed SYNChronization HOLDover DURation SYNChronization FEEstimate SYNChronization TIN Terval 3 6 DIAGnostic Subsystem This subsystem regroups the queries related to the diagnostic of the OCXO The list of the commands supported for this subsystem is as follows DIAGnostic ROSCillator EFControl RELative DIAGnostic ROSCillator EFControl ABSolute 24 O 2012 Jackson Labs Technologies Inc Ja ck S onj Fury User Manual Labs 3 6 1 DIAGnostic ROSCillator EFControl RELative This query returns the Electronic Frequency Control EFC output value of the internal reference oscillator It returns a percentage value between 100 to 100 3 6 2 DIAGnostic ROSCillator EFControl ABSolute This query returns the Electronic Frequency Control EFC output value of the internal reference oscillator It returns a value in volts between 0 and 5 V 3 7 MEASURE Subsystem This subsystem regroups the queries related of some parameters that are measured on board on the Fury The list of the commands supported for this subsystem is the following MEASure TEMPerature MEASure VOLTage MEASure CURRent MEASure 3 7 1 MEASure TEMPerature This query returns the temperature of the sensor located next to the OCXO 3 7 2 MEASure VOLTage This query returns the power supply voltage applied to the OCXO ca 10 5 V 3 7 3 MEASure CURRent This query returns the current drawn b
27. TZONe 3 4 1 1 PTIMe TZONe 3 4 1 2 PTIMe DATE 3 4 1 3 PTIMe TIME 3 4 2 PTIMe TIME STRing 3 4 2 1 PTIMe TINTerval 3 4 2 2 PTIME 3 4 3 PTIMe LEAPsecond 3 4 3 1 PTIMe LEAPsecond PENDing o 3 4 3 2 PTIMe LEAPsecond ACCumulated 3 4 3 3 PTIMe LEAPsecond DATE a 3 4 3 4 PTIMe LEAPsecond DURation 3 4 3 5 PTIMe LEAPsecond SYNChronization Subsystem 3 5 1 SYNChronization HOLDover DURation 3 5 2 SYNChronization SOURce MODE 3 5 3 SYNChronization SOURce STATE 3 5 4 SYNChronization TINTerval 3 5 5 SYNChronization IMMEdiate 3 5 6 SYNChronization FEEstimate 3 5 7 SYNChronization LOCKed 3 5 8 SYNChronization 3 5 9 SYNChronization SOURce MODE GPSIEXTemallAUTO 3 5 10SYNChronization HOLDover DURation 3 5 11SYNChronization HOLDover INITiate 3 5 125YNChronization HOLDover EN INITiate 3 5 13SYNChronization TINTerval 3 5 14SYNChronization IMMEdiate 3 5 15SYNChronization FEEstimate 3 5 16SYNChronization LOCKed 3 5 17SYNChronization DIAGnostic Subsystem 3 6 1 DIAGnostic ROSCillator EFControl RELative 3 6 2 DIAGnostic ROSCillator EFControl ABSolute MEASURE Subsystem ae 3 7 1 MEASure TEMPerature 3 7 2 MEASure VOLTage 3 7 3 MEASure CURRent 3 7 4 MEASure SYSTEM Subsystem 3 8 1 SYSTem COMMunicate 7 ae 3 8 1 1 SYSTem COMMunicate SERial ECHO 3 8 1 2 SYSTem COMMunicate SERial PROmpt O 2012 Jackson Labs Technologies Inc 2012
28. and compare the new settings to the old firmware s settings noted down on paper previously Re enter any settings that do not match the previous settings of the older firmware Type help to get instructions of how to enter the data into the SERV structure Verify that all settings have been correctly entered by typing serv at the end of the data entry session 40 O 2012 Jackson Labs Technologies Inc J a ck S on a bs Fury User Manual GPSCon Utility 5 1 Description GPSCon is a program for the monitoring and control of a variety of GPS time and frequency standard receivers It communicates with the receiver using the SCPI command set This utility can be obtained directly from Real Ham Radio com at the following URL http www realhamradio com gpscon buy now htm Important note On newer faster computers running Windows 7 GPSCon may not acquire data correctly If you encounter this problem it is recommended that you install GPSCon on a slower computer using Windows XP 5 2 Installation Follow the directions that come with GPSCon for installing the utility on your computer 5 3 Using GPSCon The GPSCon utility has a help file that should be consulted in order to get the full functionality of this utility Only a few of the features and commands are mentioned in this appendix for convenience 5 3 1 Setting the options To set up the options for your GPSCon session press the Options button belo
29. auds This command has the following format SYSTem COMMunicate SERial BAUD lt 9600 19200 38400 57600 115200 gt 3 8 2 SYSTem STATus This query returns a full page of GPS status in ASCII format The output is compatible with GPSCon 3 8 3 SYSTem FACToryReset ONCE This command applies the Factory Reset setting to the EEPROM All aging tempco and user parameters are overwritten with factory default values 3 9 SERVO Subsystem This subsystem regroups all the commands related to the adjustment of the servo loop SERVo COARSeDac lt int gt 0 225 SERVo DACGain lt int gt 0 1 10000 26 2012 Jackson Labs Technologies Inc Jackson mA SERVo EFCScale lt float gt 0 0 500 0 SERVo EFCDamping lt float gt 0 0 4000 0 SERVo SLOPe lt NEG POS gt SERVo TEMPCOmpensation lt float gt 4000 0 4000 0 SERVo AGINGcompensation lt float gt 10 0 10 0 SERVo PHASECOrrection lt float gt 100 0 100 0 SERVo 1PPSoffset lt int gt ns SERVo QUIet lt ON OFF gt SERVo TRACe lt int gt 0 255 SERVo 3 9 1 SERVo COARSeDac Fury User Manual This command sets the coarse DAC that controls the EFC The Fury control loop automatically adjusts this setting The user should not have to change this value This command has the following format SERVo COARSeDac lt int gt 0 225 3 9 2 SERVo DACGain Adjusts the gain of the DAC circuitry to match the OCXO sensitivity to voltage changes Typical values
30. certifies that this product met its published specifications at time of shipment 7 1 1 Warranty This Jackson Labs Technologies Inc hardware product is warranted against defects in material and workmanship for a period of 1 one year from date of delivery During the warranty period Jackson Labs Technologies Inc will at its discretion either repair or replace products that prove to be defective Jackson Labs Technologies Inc does not warrant that the operation for the software firmware or hardware shall be uninterrupted or error free even if the product is operated within its specifications For warranty service this product must be returned to Jackson Labs Technologies Inc or a service facility designated by Jackson Labs Technologies Inc Customer shall prepay shipping charges and shall pay all duties and taxes for products returned to Jackson Labs Technologies Inc for warranty service Except for products returned to Customer from another country Jackson Labs Technologies Inc shall pay for return of products to Customer If Jackson Labs Technologies Inc is unable within a reasonable time to repair or replace any product to condition as warranted the Customer shall be entitled to a refund of the purchase price upon return of the product to Jackson Labs Technologies Inc 7 1 2 Limitation of Warranty The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer Custo
31. ces Connecting the Rubidium s 1PPS output to the external 1PPS input and setting the mode to EXT will allow the Fury to generate a very clean low phase noise 10MHZ and I PPS output e Fury with FailSafe operation Any external 1PPS source with long term stability equal to or better than the Fury s internal OCXO can be used to discipline the Fury in case the internal GPS receiver goes into holdover mode for any reason such as Sat signal too weak GPS receiver failure antenna failure etc External sources do not have to be synchronized to UTC the 1PPS pulse may have any phase relationship to UTC as long as it s stability is equal to or better than the Fury s LTS e Using two cascaded Fury units as a double redundant frequency source Connect the 1PPS output of one Fury to the external 1PPS input of the second unit and set the second unit to SYNC SOUR MODE AUTO This will automatically switch the second Fury to the first Fury s output signal in case the second units internal GPS goes into holdover for whatever reason To provide even better reliability both Fury s should connect to separate GPS antennas and the first Fury may ultimately be connected to an external atomic clock as a triple redundant system in case GPS reception is totally denied for whatever reason The 1PPS optional input is compatible to 3 3V CMOS signals as well as SV TTL signals Signals must be OV lt x lt 5 0V to prevent damage to the unit The unit will lock o
32. demy www esacademy com il B Press the Select Device button and the window shown in Figure 4 7 will appear 2012 Jackson Labs Technologies Inc 37 Fury User Manual Jackson Figure 4 7 Device selection window in Flash Magic utility ge a XA Flash Magic NON PRODUCTION USE ONLY am Eile ISP Options Tools Hep DHIABSVE gt 02 EUR M ARM Cortex LPC900 2 clock 80051 80051 XA Technical on line articles about 8051 and X4 programming www esacademy com fag docs C Expand the ARM7 folder and select the appropriate processor in this case the LPC2136 See Figure 4 8 38 O 2012 Jackson Labs Technologies Inc J a ck S on bs Fury User Manual Figure 4 8 Processor selection in Flash Magic utility Help LPC2101 LPCA102 LPC2103 On Line training classes for microcontrollers and embedded networking and Internetworking www esacademy com fag classes D Select the Baud Rate of the Flash Magic utility to be 38400 or slower Faster Baud rates will not work properly E Set the Oscillator MHz to 10 F Check the box marked Erase blocks used by Hex File Warning Make sure NOT to check the box marked Erase all Flash Code Rd Prot under any circumstances this may erase factory calibration data and the unit will not operate and will have to be returned to the factory Checking this box on the ISP utility will thus void the warranty
33. e commands supported for this subsystem is the following SYNChronization SOURce MODE GPS EXTernal AUTO SYNChronization SOURce STATE O 2012 Jackson Labs Technologies Inc 21 Fury User Manual Jackson SYNChronization HOLDover DURation SYNChronization TINTerval SYNChronization IMMEdiate SYNChronization FEEstimate SYNChronization LOCKed SYNChronization 3 5 1 SYNChronization HOLDover DURation This query returns the duration of the present or most recent period of operation in the holdover and holdover processes This is the length of time the reference oscillator was not locked to GPS The time units are seconds The first number in the response is the holdover duration The duration units are seconds and the resolution is 1 second If the Receiver is in holdover the response quantifies the current holdover duration If the Receiver is not in holdover the response quantifies the previous holdover The second number in the response identifies the holdover state A value of 0 indicates the Receiver is not in holdover a value of 1 indicates the Receiver is in holdover 3 5 2 SYNChronization SOURce MODE The Source Mode command allows an optional external TTL level 1PPS input to be connected to the Fury board on connector J7 pin 3 The unit can use this external 1PPS input instead of the internal GPS generated 1PPS Switching to the external 1PPS is either done manually with the EXT command option or automaticall
34. es no leap second is pending A value of 1 indicates a leap second is pending The leap second adjustment can be either the addition of a second or the subtraction of a second 3 4 3 2 PTIMe LEAPsecond ACCumulated Returns the leap second difference accumulated between GPS time and UTC time since the beginning of GPS time The time units are seconds 3 4 3 3 PTIMe LEAPsecond DATE Returns the date of the future the leap second usually UTC June 30 or UTC December 31 or the last one if a future one is not scheduled yet 3 4 3 4 PTIMe LEAPsecond DURation This query identifies whether a leap second is pending distinguishes between leap seconds which extend the minute and leap seconds which shorten the minute This query returns the duration of the minute corrected by the next leap second The duration units are seconds The return value is 59 60 or 61 A value of 59 indicates subtraction of 1 second is pending A value of 60 indicates no leap second pending A value of 61 indicates addition of 1 second is pending Returns the duration of the minute corrected by the next leap second 3 4 3 5 PTIMe LEAPsecond This query display at one the result of the 4 following queries PTIMe LEAPsecond PENDing PTIMe LEAPsecond ACCumulated PTIMe LEAPsecond DATE PTIMe LEAPsecond DURation 3 5 SYNChronization Subsystem This subsystem regroups the commands related to the synchronization of the Fury with the GPS receiver The list of th
35. h until the Red Jumper JP3 marked by the red arrow in Figure 4 3 is visible Using tweezers or very small pliers move the jumper JP3 next to RS232 connector from position 1 2 to position 2 3 Be careful not to touch the adjacent cables and connector pins with the tweezers or pliers Figure 4 3 Jumper JP3 location 2012 Jackson Labs Technologies Inc 33 Fury User Manual Jackson Push the PCB back into the enclosure making sure that the unit is fully closed Re apply power to the unit Now press the RESET button or power cycle the unit If the LED s blink the jumper JP3 has not been set correctly and the unit is not in ISP mode The unit has now been set to ISP mode and is awaiting the firmware download 4 5 ISP Flash Loader Utility installation There are two Flash loader utilities available to upgrade the Fury firmware You can download the Philips LPC2000 utility from the Jackson Labs Technologies Inc website under the Support tab http www jackson labs com support html The Flash Magic utility is available for download on the Flash Magic website http www flashmagictool com 4 5 1 Philips LPC2000 Flash Utility The first is the Philips LPC2000 utility version 2 2 3 Please note that some computers are known to be incompatible with the LPC2000 flash utility Preliminary investigations show Windows Media Center and or Centrino vPro processor systems to create download difficulties Please use a different
36. he following command 1000 seconds shown as an example 10 000 seconds are set as the default GPS POS SURV MAXP 1000 2 1 4 1 Backup Battery There is a known issue wth the backup battery Sometimes the GPS receiver may not properly lock to GPS sattelites This has been traced to the small lithium coin cell backup battery and potential corruption in the Almanac and RTC that is driven by the backup battery labeled U13 The backup battery is used to aid the GPS receiver to achieve lock faster It is not required for normal operation and may be removed see Figure 2 3 for location of backup battery Removing the backup battery will sometimes actually aid in faster GPS aquisition as well as make the unit perform a cold start auto survey automatically after power on due to the lost almanac and GPS receiver settings including the position hold position While the backup battery can last up to 10 years if the GPS receiver is powered externally it can also discharge within 6 to 8 months if the board is placed in storage and create problems when not fully charged Jackson Labs Technologies Inc recommends removing the backup battery unless the unit has to perform without initiating an auto survey after power on 2 1 5 Connecting an LCD Display An optional standard 16x2 LCD with 16 pin connector may be connected to the unit for displaying status information Larger displays such as 20x4 LCD displays may also work Figure 2 4 shows how the LC
37. he next 1 PPS pulse estimated by the GPS receiver This value is in the range 128 ns 127ns 3 3 3 5 GPS REFerence PUlse ACCuracy This query displays the 1 sigma accuracy estimate in nanoseconds of the 1 PPS pulse estimated by the GPS receiver This value is in the range 0 65635 16 O 2012 Jackson Labs Technologies Inc Ja ck S onj Fury User Manual Labs 3 3 3 6 GPS REFerence PULse This query displays the status of the 1 PPS pulse 0 0ff 1 on 3 3 4 GPS SATellite This group of commands describe the satellite constellation 3 3 4 1 GPS SATellite TRACking EMANgle This command sets the Elevation Mask Angle The receiver will attempt to track satellites for which the elevation angle is greater then the satellite mask angle The format of the command is the following GPS SATellite TRACking EMANgle lt int gt 0 89 This parameter is set at 10 on Factory Reset 3 3 4 2 GPS SATellite TRAcking COUNt This query returns the number of satellites being tracked 3 3 4 3 GPS SATellite VISible COUNt This query returns the number of satellites PRN that the almanac predicts should be visible given date time and position 3 3 4 4 GPS SATellite VISible COUNt This query returns the number of satellites PRN that the almanac predicts should be visible given date time and position 3 3 4 5 GPS POSition 3DFix This command places the GPS receiver in 3DFix mode instead of position hold mode 3 3 4 6 GPS
38. iarity with the SCPI protocol is recommended when reading this chapter 3 2 General SCPI Commands 3 2 1 IDN This query outputs an identifying string The response will show the following information lt company name gt lt model number gt lt serial number gt lt firmware revision gt 3 2 2 HELP This query returns a list of the commands available for the Fury GPSDO 3 3 GPS Subsystem The GPS subsystem regroups all the commands related to the control and status of the GPS receiver The list of the commands supported is the following O 2012 Jackson Labs Technologies Inc 13 Fury User Manual Jackson Labs GPS INITial DATE lt yyyy mm dd gt GPS INITial TIME lt hour min sec gt GPS INITial POSition lt N S lt deg min sec gt E W lt deg min sec gt lt height in meters gt gt GPS POSition lt N S gt lt deg min sec gt lt E W gt lt deg min sec gt lt height in meters gt GPS POSition SURVey GPS POSition HOLDSURVey GPS POSition LAST GPS POSition SURVey STATe ONCE GPS POSition HOLD LAST GPS POSition 3DFix GPS REFerence ADELay lt float gt lt s ns gt GPS REFerence TRAIM ON OFF GPS REFerence TRAIM RSVIDs GPS REFerence PULse SAWtooth GPS REFerence PUlse ACCuracy GPS REFerence PULse GPS SATellite TRACking EMANgle lt int gt 0 89 GPS SATellite TRACKing COUNt GPS SATellite VISible COUNT GPS GPGGA lt int gt 0 255 GPS STATus GPS STATus STRing GPS 3 3 1 GPS INITial
39. is command has the following format GPS POSition SURVey MAXPoints lt int gt 0 10000 When the unit has received the number of 1PPS signals specified by this command it will issue a specific command to the GPS to stop the autosurvey this is equivalent than issuing the SCPI command GPS POSition HOLDSURVey 3 3 2 7 GPS POSition HOLD LAST This query displays the LAST HOLD position 3 3 3 GPS REFerence This subgroup of commands are about the 1 PPS Reference pulse 3 3 3 1 GPS REFerence ADELay This command sets the GPS antenna delay value in seconds or nanoseconds if the unit is specified The format of the command is the following GPS REFerence ADELay lt float gt lt s ns gt 3 3 3 2 GPS REFerence TRAIM This command turns on or off the M12 T RAIM Time Receiver Autonomous Integrity Monitoring This is an algorithm implemented in the GPS receiver that uses redundant satellite measurements to confirm the integrity of the timing solution This algorithm requires at least 4 tracked satellites in order to be able to generate the 1 PPS signal T RAIM is enabled by default on Factory reset This command is the following format GPS REFerence TRAIM ON OFF 3 3 3 3 GPS REFerence TRAIM RSVIDs This query displays a 32 bit field number which indicates which SIDS were removed by T TRAIM 3 3 3 4 GPS REFerence PULse SAWtooth This query displays the current value in nanoseconds of the negative sawtooth time error of t
40. ity gets confused and this process from item 4 6 B has to be tried several times It is not necessary to press reset as the utility is asking Just press OK on the utility window s button Warning DO NOT PRESS THE ERASE BUTTON AT ANY TIME THIS WILL RENDER THE PCB USELESS AND CAN ONLY BE RECOVERED AT THE FACTORY 4 6 2 Flash Magic Flash Programming Utility A Open the Flash Magic utility Set the COM port in the Flash Magic application as needed on your PC Set Interface to None ISPY 36 2012 Jackson Labs Technologies Inc Ja ck S on a bs Fury User Manual Figure 4 6 Flash Magic Flash Utility settings 4 Flash Magic NON PRODUCTION USE ONLY File ISP Options Tools ala BRE gt HIS i Step 1 Communications Step 2 Erase Select Device LPC2138 Erase block O 0 000000 Ok000FFF Erase block 1 0x001000 0x001FFF COM Port COM 4 Y Erase block 2 0x002000 0x002FFF Erase block 3 0x003000 0x003FFF Baud Hato 65409 Y Erase block 4 0x004000 0x004FFF Interface None ISP Erase block 5 0x005000 0 005FFF F Erase all Flash Code Rd Prot Oscillator MHz 110 J Erase blocks used by Hex File Step 3 Hex File Hex File WFireFlylA_2 19 hex Modified Unknown more info Verify after programming Fill unused Flash Gen block checksums Execute Your Training or Consulting Partner Embedded Systems Aca
41. lick always overrides the span setting To display all of the data in the file without manually setting the span to zero you should right double click in the graph This has the effect of setting the start time to zero the stop time to infinity and asserting the mouse override condition To release left double click Since this is harder to describe than to actually do here is a paraphrase of the above To zoom in The mouse is used to set the left extent and the right extent of the portion of the curve that the user wants to fill the screen Click once with the left mouse button on the point that marks the left side of what you want to be the magnified curve Immediately that point becomes the left end of the curve Then similarly click the right mouse button on the curve at the time you wish to be the right most portion of the magnified curve and it immediately becomes the end point on the right side And finally to return to the zoomed out fit to window view left double click on the curve 2012 Jackson Labs Technologies Inc 45 Fury User Manual 46 Jackson 7 Remember in order to see all the data in the log file you must either set the span control to zero or right double click in the graph When you have locked the start and stop time using the mouse you can scroll left or right through the data without changing the span To scroll to a later time use Shift Left click To scroll to an earlier time use Shift
42. mer supplied software or interfacing unauthorized modification or misuse opening of the instruments enclosure or removal of the instruments panels operation outside of the environmental or electrical specifications for the product or improper site preparation and maintenance JACKSON LABS TECHNOLOGIES INC SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 2012 Jackson Labs Technologies Inc 53 Fury User Manual Jackson Labs PURPOSE No license express or implied by estoppel or otherwise to any intellectual property rights is granted by this document Jackson Labs Technologies Inc products are not intended for use in medical life saving or life sustaining applications 7 1 3 Exclusive Remedies THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER S SOLE AND EXCLUSIVE REMEDIES JACKSON LABS TECHNOLOGIES INC SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY 54 O 2012 Jackson Labs Technologies Inc
43. mputer and set the baud rate to 115200 parity to None Data Bits to 8 and Stop Bits to 1 Set Flow Control to None Once you have configured the communication parameters press the OK button to close the window 5 3 1 2 Auxiliary parameters After pressing the Options button you can select Auxiliary and set other options or measurements See Figure 5 3 for an example of an auxiliary measurement You will notice that the Aux request string has been set to meas current lt CD gt and the Log Aux box is checked In the area below labeled Traces to be visible on the graph the box Aux 1 is checked and the label OCXO curr has been added 42 2012 Jackson Labs Technologies Inc Fury User Manual Jackson E Figure 5 2 Setting the communications parameters at S 6 GPSCon Utility Pro GPSCon COM4 Export Help About PRN EL AZ SS Map Graph Status Time C XON XOFF RTS CTS 2012 Jackson Labs Technologies Inc 43 Fury User Manual Jackson Figure 5 3 Auxiliary Parameters window ne da x Ot A Paths amp settings FTP Email Coms Time services Audiary Aux coms Export graphics Remote control cote conan fl 2nd port error request sting _ SYSTERR7 lt CR gt 7 Enable second serial port 2nd port OK prompt scpi lt SPC gt gt lt SPC gt Wildcard for any character type is Wildcard for numeric character is 4
44. n PTIMe TINTerval PTIME PTIMe LEAPsecond PENDing PTIMe LEAPsecond ACCumulated PTIMe LEAPsecond DATE PTIMe LEAPsecond DURation PTIMe LEAPsecond 3 4 1 PTIMe TZONe Sets the time zone local time offset to provide an offset from UTC to serve as the basis for all reported time This command has the following format PTIMe TZONe lt hour min gt 12 12 0 59 3 4 1 1 PTIMe TZONe Returns the local time zone offset 3 4 1 2 PTIMe DATE This query returns the current calendar date The local calendar date is always referenced to UTC time offset by any local time zone value that has been provided by the user The year month and day are returned 3 4 1 3 PTIMe TIME This query returns the current 24 hour time The local time is referenced to UTC time The hour minute and second is returned 3 4 2 PTIMe TIME STRing This query returns the current 24 hour time suitable for display for example 13 24 56 3 4 2 1 PTIMe TINTerval This query is equivalent to the command SYNChronization TINTerval 3 4 2 2 PTIME This query returns at once the result of the four following queries PTIME DATE PTIME TIME PTIME TZONE PTIME TINTerval 20 2012 Jackson Labs Technologies Inc Ja ck S onj Fury User Manual Labs 3 4 3 PTIMe LEAPsecond 3 4 3 1 PTIMe LEAPsecond PENDing This query identifies if a leap second is pending This query looks ahead to indicate a pending leap second A value of 0 indicat
45. nto signals with rising edge synchronization The signal rising edge maximum time is 10ns 10 to 90 Pulse width should be lus or longer A Phase relationship to UTC is not needed on this 1PPS input The stability of the external 1PPS signal should be as good or preferably significantly better than the Fury s OCXO long term stability otherwise the performance of the Fury may actually be degraded when operating from the external 1PPS signal 2 2 Remote serial control e The unit is controlled via the Serial port at 115200 baud 8N 1 but this only works if the LCD display shows SCPI MODE default setting The RS 232 receiver is disabled outside of the SCPI display page Swap through the pages with a momentary on type button connected to JP1 pins 5 and 6 e Use a standard 9 pin NULL MODEM cable to connect the Fury unit to your PC s Hyperterminal or the optional GPSCon software package When using Hyperterminal or similar terminal program on your PC you must disable hardware handshaking flow control 10 2012 Jackson Labs Technologies Inc Jackson 7 2 2 1 Help and command overview Fury User Manual e A listing of the available RS 232 commands can be shown by typing in help e IDN can be used to see if the connection works Both commands need to be followed by pressing Enter 2 2 2 Loop parameter adjustment LOOP PARAMETERS ARE PRE SET TO OPTIMAL VALUES BY THE FACTORY CHANGING THESE VALUES IS NOT
46. ollow the instructions in order to prevent corrupting the Fury Flash which may require reflashing at the factory With some practice the entire Flash upgrade can be done in less than one minute even though the following seems like a fairly long list of instructions 4 2 Recording Factory Calibration data It is not necessary to do the following but it is recommended that the factory calibration data is written down on paper in case the flash update fails for some reason Follow the steps in this section to print out important calibration data A The unit can be controlled via the Serial port at 115200 baud 8N1 defaults but this only works if the LCD display shows SCPI MODE In Fury Desktop units the system is set to SCPI mode by default For Fury units with LCD connected the RS 232 receiver is disabled outside of the SCPI display page Swap through the LCD menu pages with a momentary on type button connected to JP1 pins 5 and 6 until the LCD display shows SCPI MODE Make sure Hyperterm is set to the same Baud rate as shown in the LCD display typically 115200 Baud B At the prompt type in serv and press enter The data displayed in Figure 4 1 will appear or something similar every units data etc will be different 2012 Jackson Labs Technologies Inc 31 Fury User Manual Jackson Figure 4 1 Fury factory calibration data output scpi gt serv COARSE DAC 121 EFC SCALE 3 00 EFC DAMPING 508 O
47. on into the GPS receiver use the command GPS POSition LAST 3 3 2 2 GPS POSition SURVey This command stops the current running auto survey The receiver will take its current average position as its hold position 3 3 2 3 GPS POSition HOLDSURVey This command does like the GPS POSition SURVEY and also stores that position in the LAST HOLD position 3 3 2 4 GPS POSition LAST The parameter LAST denotes the LAST HOLD position This command cancels the current auto survey if any and restores the last position setting This command together with the command GPS POSition allows to skip the autosurvey process This command is very useful when the user knows the precise location of the GPS Antenna already 3 3 2 5 GPS POSition SURVey STATe ONCE This command starts an auto survey The auto survey lasts about 3 hours In some occasions it can even last longer if the GPS antenna is not properly placed An auto survey can be stopped at anytime with the command GPS POSition SURVey 3 3 2 6 GPS POSition SURVey MAXPoints This command specifies the number of acquisition points needed to achieve an Autosurvey By default the Motorola M12 does an average of 10000 acquisition points e g about three hours 2012 Jackson Labs Technologies Inc 15 Fury User Manual Jackson before to exit the Autosurvey At the expense of a slightly less accurate hold position the Autosurvey duration can be shortened significantly using this command Th
48. ormat SERVo SLOPe lt NEG POS gt 3 9 6 SERVo TEMPCOmpensation This parameter is a coefficient that reflects the correlation between the Current provided to the OCXO and the EFC This coefficient is automatically computed and adjusted over time by the Jackson Labs firmware if the OCXO is powered by the Fury PCB itself A linear relationship between OCXO current and ambient temperature must exist for Fury to properly compensate for ambient temperature changes This command has the following format SERVo TEMPCOmpensation lt float gt 4000 0 4000 0 3 9 7 SERVo AGINGcompensation This parameter is a coefficient that represents the drift of the EFC needed to compensate the natural drift in frequency ofthe OCXO due to aging This coefficient is automatically computed and adjusted over time by the Jackson Labs firmware This command has the following format SERVo AGINGcompensation lt float gt 10 0 10 0 3 9 8 SERVo PHASECOrrection This parameter sets the Integral part of the PID loop Loop instability will result if the parameter is set too high Typical values are 10 0 to 30 0 This command has the following format SERVo PHASECOrrection lt float gt 100 0 100 0 28 O 2012 Jackson Labs Technologies Inc Ja ck S on a bs Fury User Manual 3 9 9 SERVo 1PPSoffset This command sets the Fury 1PPS signal s offset to UTC in 16 7ns steps For 1ns granularity see the command GPS REFerence ADELay Changing the GPS REF
49. p 2 1 J6 is 3 3Vpp J5 Option CMOS Out Option for J6 see J6 3 TTL 2 GND 1 GND JP9 Power Clean 12V Supply 11 0V 14 0V DC lt 1 0A lt 10mVac 1 12V 2 GND JP5 Ant Power 3 3V 5V Ant Select Jumper Option 1 2 3 3V Ant 2 3 5V Ant P1 RS 232 SYS SCPI Control RS 232 2 RXD 3 TXD 5 GND J3 1PPS In 1PPS Input Option 3 3V max Only use w o GPS 1 GND 2 GND 3 1PPS JP6 ISP Factory Diag None None JP4 1PPS Select GPS OCXO 1PPS Jumper Option 1 2 OCXO 1PPS 2 3 GPS RAW 1PPS J2 1PPS Out 1PPS Output 5V CMOS 500hms Do Not 3 1PPS Output 2 GND 1 GND Terminate J1 Alarm Alarm Indicator 3 3V TTL 1 Alarm 0 0K 3 Alarm 2 GND 1 GND JP3 ISP Select Enable Flash ISP Jumper Option 3 2 ISP enabled 2 1 Normal JP10 Auto Survey GPS Auto Survey Jumper Option 3 2 Enable Auto Survey 2 1 Normal J7 External 1PPS In Backup 1PPS Input CMOS TTL Input 5V max 1 GND 3 1PPS in 5 12V Caution Do not short pins to pin 4 JP1 Keypad Option Keypad Connect Short To GND to press key 5 Select Menu 6 GND 7 3 3V lt 20mA 4 3 2 1 NC JP2 LCD 16x2 LCD Connect HD44780 Type TTL 1 GND 2 5V 3 Contrast 4 RS 5 RW 6 EN 7 8 9 10 GND 11 DA4 12 DA5 13 DA6 14 DA7 15 LED 16 LED 2 1 3 Connecting the GPS Antenna Connect the GPS antenna to the BNC cable and select the GPS Antenna voltage with the Jumper as shown in Figure 2 3 Warning Use a Lightning Arrestor on your Antenna setup 2012 Jackson Labs Technologies Inc
50. sion 1 15 and above an optional external TTL level 1PPS input can be connected to the Fury board on connector J7 pin 3 see Figure 2 5 Figure 2 5 External 1PPS input 1PPS signal on this pi CAUTION 12V on this pin Can damage other pins The unit can use this external 1PPS input instead of the internal GPS generated 1PPS Switching to the external 1PPS has two modes of operation The manual mode where the user chooses specifically the 1 PPS source input using the following SCPI command SYNC SOUR MODE lt GPS EXT gt While in this mode the unit will remain using this 1 PPS input even during holdover e In automatic mode the unit switches automatically to the external 1PPS source when the unit goes into holdover for more than 15 seconds The unit will switch back automatically after the GPS O 2012 Jackson Labs Technologies Inc 9 Fury User Manual Jackson 1PPS source reappears for at least 3 seconds The automatic mode can be selected with the following SCPI command SYNC SOUR MODE AUTO The state of the 1PPS input selection can be checked with the SCPI query SYNC SOUR STATe The 1PPS selection is stored in memory and will remain active after power cycling or reset of the unit Using the external 1PPS input allows the Fury GPSDO very flexible operation in a number of different application scenarios e Fury as a Rubidium Clean Up Loop The Fury can act as a PLL clean up loop for noisy Rubidium sour
51. ternal CMOS rising edge 1PPS signal with OV lt x lt SV signal level and lus minimum pulse width into the unit Use one of the various ground pins on the board as a 1PPS signal return By default the unit is set to GPS It may be hard coded to only use the external 1PPS source by setting EXT or it may be auto switched to the external 1PPS signal if the internal GPS receiver does not generate 1PPS pulses for longer than 15 seconds 1f the signal is too week or there is a GPS failure When set to the AUTO setting the unit will switch back to the internal GPS receiver once 1PPS pulses are generated internally again 3 5 10 SYNChronization HOLDover DURation This query returns the duration of the present or most recent period of operation in the holdover and holdover processes This is the length of time the reference oscillator was not locked to GPS The time units are seconds The first number in the response is the holdover duration The duration units are seconds and the resolution is 1 second If the Receiver is in holdover the response quantifies the current holdover duration If the Receiver is not in holdover the response quantifies the previous holdover The second number in the response identifies the holdover state A value of 0 indicates the Receiver is not in holdover a value of 1 indicates the Receiver is in holdover 3 5 11 SYNChronization HOLDover INITiate The command will place the unit into a forced holdover state while still
52. the graph the following observations can be made e We can see that the Fury out performs the more expensive Cesium by almost 10 to 1 at around 1 second measurement intervals It performs better than the Cesium up to about 10 second measurement intervals e We can see that the Fury approaches the 5071A stability at about 40 000 second 11 hours measurement intervals e In the worst case the Fury compares to the 5071A at 400 second intervals with 4E 012 to 6E 013 In other words in the worst case the Fury is only 6 7x worse at 400 second intervals The Cesium unit is almost 36x times more expensive than the Fury yet the Fury will out perform the Cesium over very long measurement periods 50 O 2012 Jackson Labs Technologies Inc J a C k S on bs Fury User Manual Figure 6 1 Fury Allan Deviation 22 Oct 2007 10 18 12 Allan Deviation oy t 10 10 10 11 10 12 10 13 10 14 10 2 10 1 100 101 102 10 104 105 Averaging Time t seconds Ch A 10 0 MHz 1 6 Vop Ch B 10 0 MHz 2 5 Vpp Averaged Phase B A Single DDS 6 2 2 6 3 Conclusions The conclusion that can be drawn from the above information is that the Fury GPSDO represents the best performance price ratio on the market today O 2012 Jackson Labs Technologies Inc 51 Fury User Manual Jackson 52 2012 Jackson Labs Technologies Inc J a ck S onj Fury User Manual Labs Certification and Warranty 7 1 Certification Jackson Labs Technologies Inc
53. variance is a measure of frequency stability in clocks oscillators and amplifiers It is named after David W Allan It is expressed mathematically as oy2 1 The Allan deviation ADEV is the square root of Allan variance It is also known as sigma tau and is expressed mathematically as oy T The M sample variance is a measure of frequency stability using M samples time T between measures and observation time M sample is expressed as oy M T 1 O 2012 Jackson Labs Technologies Inc 49 Fury User Manual Jackson Labs The Allan variance is intended to estimate stability due to noise processes and not that of systematic errors or imperfections such as frequency drift or temperature effects The Allan variance and Allan deviation describe frequency stability Figure 6 1 is a graph of Allan deviation ADEV for the DOCXO Fury in comparison to the Symmetricon A gilent 5071A Cesium Atomic Clock Standard costing many times more The red trace is the Cesium long term ADEV of a typical 5071A unit The black trace is the ADEV of a typical Fury DOCXO unit locked to GPS It can be observed that the stability of the devices improves as the averaging period gets longer since some noise types can be removed by averaging At some point however more averaging no longer improves the results This point is called the noise floor or the point where the remaining noise consists of non stationary processes such as aging or random walk From
54. w band tracking mode Bit 9 Fast Acquisition Position Bit 8 Filter Reset to Raw GPS Resolution Bit 7 Cold Start no almanac or out of data almanac Bit 6 Differential Fix Bit 5 Position Lock Bit 4 Autosurvey Mode Bit 3 Insufficient Visible Satellites Bit 2 1 Antenna Sense Bit 0 Code Location This query is suitable for parsing from Host software 00 OK 01 OverCurrent 10 UnderCurrent 11 NotValid 0 External 1 Internal 2012 Jackson Labs Technologies Inc Ja ck S on a bs Fury User Manual 3 3 5 2 GPS STATus STRing This query will display the GPS status as described in the query GPS STATus in an ASCII form suitable for display 3 3 6 GPS The query displays at once all the configuration of the GPS receiver Here is an example of the output of such a query ANTENNA DELAY 2e 09 MASK ANGLE 10 TRACKED SATS 6 VISIBLE SATS 7 SURVEY STATE 0 TIME ZONE 7 00 ACTUAL POSITION N 37 17 58 9510 W 121 57 33 7390 45 40 m LAST HOLD POSITION N 0 0 0 0000 E 0 0 0 0000 0 00 m PULSE STATUS 1 PULSE ACCURACY 44 PULSE SAWTOOTH 4 TRAIM FILTER 1 TRAIM REMOVED SVIDS 00000000 3 4 PTIME Subsystem The PTIME subsystem regroups all the commands related to the management of the time The list of the commands supported is the following PTIMe TZONe lt hour min gt 12 12 0 59 PTIMe TZONe PTIMe DATE PTIMe TIME PTIMe TIME STRing 2012 Jackson Labs Technologies Inc 19 Fury User Manual Jackso
55. w the display area The window shown in Figure 5 1 will appear You can select from the tabs which options you wish to set 2012 Jackson Labs Technologies Inc 41 Fury User Manual Jackson Figure 5 1 Options window i GPSCon Utility Pro GPSCon COM4 9 ee A ola ME Status Time Map Graph Export Help About TO Lai Paths amp settings FTP Email Coms Time services Ausilary Aux coms Export graphics Remote control Logging and graph M Log Status yne documents ja labs gpscc slog M Log EFC Interval 30 j secs M Log sat count M Tlto GPS Local HTML and image files HTML file c program files amp 86 gpscon gpsstat htm Browse M LogPU F Blit from display bitmap M Translate time codes Pixels 317 HTML update interval 30 4 secs 7 Continuously read error queue I Fash LED Satellite tracking history file FF Use bitmap Track file c program files amp 86 gpscon gpsdmp bin Browse M Statistics Max kB 0 unlimited 512 4 M Show best fit to EFC I ANSI font in stat Span 2020 mins wai F Timax fe ns Filter coeff 0 025 Max kB 0 unlimited 0 5 3 1 1 Communication Parameters Before you can use GPSCon you must set the communication parameters for your system Open the dialog box by pressing the Options button Then select the Coms tab You will see the window shown in Figure 5 2 Select the correct COM port for your co
56. wer power during that event In Figure 5 6 which is a zoom of Figure 5 5 we can see the phase offset error of the internal OCXO to the UTC GPS reference We can see the maximum drift is 77ns to 93ns The average 1s TI av 0 03ns The standard deviation over the 200 hour plot is sd 11ns This means the average error of the 10MHZ phase of this unit over 200 hours is only 11ns rms Or in other words the average jitter wander over 200 hours of operation is 11ns 200Hrs 1 528E 014 or in other words the unit performs as well as a high quality Cesium Atomic reference clock over long periods of time The unit disciplines its internal 10MHz reference to within less than 80ns peak to peak of UTC at all times which is less than one complete clock cycle at 10MHz 48 2012 Jackson Labs Technologies Inc J a ck S on a bs Fury User Manual Performance 6 1 Introduction The Fury GPSDO represents the state of the art in GPSDOs technology and provides the best performance price ratio available today This chapter presents some of the performance data of the Fury and compares it to more expensive competition 6 2 Performance Parameters The two three most important parameters that determine the performance of a GPSDO are frequency accuracy and stability The stability of the clock is determined by the Allan Variance or Allan Deviation 6 2 1 Allan Variance and Deviation The Allan variance AVAR also known as two sample
57. y the OCXO This current varies in order to keep a stable temperature inside the OCXO 3 7 4 MEASure This query returns the result of the three following queries MEASure TEMPerature MEASure VOLTage MEASure CURRent 3 8 SYSTEM Subsystem This subsystem regroups the commands related to the general configuration of the Fury The list of the commands supported for this subsystem follows 2012 Jackson Labs Technologies Inc 25 Fury User Manual Jackson SYSTem COMMunicate SERial ECHO lt ON OFF gt SYSTem COMMunicate SERial PROmpt lt ON OFF gt SYSTem COMMunicate SERial BAUD lt 9600 19200 38400 57600 115200 gt SYSTem STATus SYSTem FACToryReset ONCE 3 8 1 SYSTem COMMunicate 3 8 1 1 SYSTem COMMunicate SERial ECHO This command enables disables echo on RS 232 It is preferable to disable the echo when used with the software GPSCon This command has the following format SYSTem COMMunicate SERial ECHO lt ON OFF gt 3 8 1 2 SYSTem COMMunicate SERial PROmpt This command enables disables the prompt scpi gt on the SCPI command lines The prompt must be enabled when used with the software GPSCon This command has the following format SYSTem COMMunicate SERial PROmpt lt ON OFF gt 3 8 1 3 SYSTem COMMunicate SERial BAUD This command sets the RS 232 serial speed The serial configuration is always 8 bit 1 stop bit no parity no HW flow control Upon Factory reset the speed is set at 115200 b
58. y with the AUTO command option in case the GPS receiver goes into holdover mode for any reason The command has the following format SYNChronization SOURce MODE GPS EXTernal AUTO 3 5 3 SYNChronization SOURce STATE This query shows the state of the external 1PPS synchronization option 3 5 4 SYNChronization TINTerval This query returns the difference or timing shift between the Fury 1 PPS and the GPS 1 PPS signals The resolution is 1E 10 seconds 3 5 5 SYNChronization IMMEdiate This command initiates a near instantaneous alignment of the GPS 1 PPS and Receiver output 1 PPS To be effective this command has to be issued while not in holdover 3 5 6 SYNChronization FEEstimate This query returns the Frequency Error Estimate 22 2012 Jackson Labs Technologies Inc Ja ck S onj Fury User Manual Labs 3 5 7 SYNChronization LOCKed This query returns the lock state O OFF 1 ON of the PLL controlling the OCXO 3 5 8 SYNChronization This query returns the results of the four following queries SYNChronization SOURce MODE SYNChronization SOURce STATE SYNChronization HOLDover DURation SYNChronization TINTerval SYNChronization FEEstimate SYNChronization LOCKed 3 5 9 SYNChronization SOURce MODE GPSIEXTernal AUTO The board may be configured lock to an external 1PPS source or the internal GPS receiver A small through hole pad next to the SMA connectors labeled 1PPS IN may be used to feed an ex
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