GPS10RBN - 10 MHz, GPS Disciplined Rubidium Frequency Standard
Contents
1. Optional to 105 dBc Hz available Optional to 140 dBc Hz available Optional to 157 dBc Hz available Optional to 165 dBc Hz available Optional to 168 dBc Hz available Optional to 168 dBc Hz available GPS10RBN Brochure Precision Test Systems Ltd 1997 2011 Allan Deviation when locked to GPS Satellites typical Observation Time seconds Observation Time 10 seconds Observation Time 100 seconds Observation Time 1000 seconds Observation Time 10000 seconds Observation Time 100000 seconds Observation Time week lt 2x10 lt 1x107 lt 2x 10 lt 7x10 lt 6x 10 lt 7x10 lt 3x 10 GPS10RBN in full lock for gt 1 week gt 3 satellites in view Ambient temperature 0 C to 50 C Temperature change less than 3 C per hour Rubidium Drift when GPS10RBN NOT Locked to GPS Satellites Drift due to aging Drift due to temperature Number of Channels Frequency Acquisition Time Positioning Accuracy Jamming Immunity Antenna Datum Operating Temperature Storage Temperature Magnetic Field AC Power Inlet with switch AC Voltage Range Power consumption Fuse rating Dimensions Width x Depth Height and weight Weight Supplied Accessories Antenna Power cord Instruction manual Overall Frequency Range Step Size Frequency Accuracy Sinewave Frequency Range Sinewave Output level Spurious and Harmonic Output Squarewave Frequency Range Squarewave Output Level Allan deviation 100 seco2. aligned to UTC but has the advantage of less than 300 ps jitter Most other frequency standards quote 50 100 ns Very Low Phase Noise The GPSIORBN is one of the lowest phase noise frequency standards available at any price Phase noise is often overlooked but is one of the most important specifications of a frequency standard Many of today s high performance signal generators for example have very low phase noise outputs These signal generators have their own internal low phase noise crystal oscillator However if this type of instrument is used with an external frequency source it is essential that the external frequency source has an equally low phase noise output as the internal oscillator Otherwise the signal generators phase noise may be impaired Of course it s not only signal generators that could suffer but also any other type of instrument that relies on a low phase noise frequency source to operate correctly A typically phase noise plot is shown below The blue line is the specification line The black line is the actual phase noise The light blue are the line frequency spurs typical with any measurement that is AC powered eo HP 3048A Carrier 10 E 6 Hz 6 12 09 13 09 44 14 31 30 ee LE ae AL A TERRAN as ee ere S eer renee eee ecm tinct serra tere rot eee N bee 95 Oe es eee ee eee fecnccncnccecenascneee be m 100 N PP E E Ectevapisosessadsesea ee 105 i 110 115 120 125 130
3. 135 140 145 150 155 160 165 170 TF 100 ik Tok To in f CdBevHz vs flHzJ Keyboard Control and LCD Display A 16 way keyboard is used to interface to three microprocessors that control the GPSIORBN The LCD display s over 50 different menus These menus show all the relevant information including time position longitude latitude height number of satellite tracked health of each satellite and the status of the rubidium oscillator Allan Deviation Plot of the GPS10RBN and the GPS signal The diagram below shows the Allan deviation of a typical GPS signal pink the Allan deviation of the GPS1ORBN s rubidium oscillator when free running not locked to the GPS signal yellow and the actual output of the GPS1IORBN when locked to the GPS signal blue As can be seen the GPSIORBN combines the short term stability of the rubidium oscillator with the long term stability of the GPS signal to achieve short and long term stability of its frequency output signal GPS10RBN Brochure Precision Test Systems Ltd 1997 2011 10000 Toga GPS10R O GPS Signal Free Running Rubidium Root Allan Variance parts in 10E 12 Joa 8 Observation Time Seconds Multiple Frequency Outputs The GPSIORBN has many different output options These outputs are Buffered 10 MHz sinewave outputs Each output is fully isolated from each other The amplitude of each output can be individuall
4. Precision Test Systems orecsiom TEST SYSTEMS GPSIORBN 10 MHz GPS Disciplined Rubidium Frequency Standard ec uA gH Precision GPS1IORBN es 2 21 Tan 2000 Disp M Ms Mc Toeka EO Test 7 2 uai EERE GPS Disciplined Systems Rubidium Frequency Standard E i oa Key Features e Completely self contained unit No extra P C e Multiple 10 MHz Outputs plus other outputs needed Full information available via LCD e Windows software with full control and monitoring of e Rubidium Oscillator locked to GPS satellite signal the GPSIORBN via RS232 USB Ethernet or the web Accuracy to parts in 10 Stratum 1 performance e 19 2U high rack mountable case GPS10RBN or e Free run mode Rubidium still gives an accurate bench mount unit GPS10R output without a GPS satellite signal Stratum 1 Very Low Microphonics e Two pps time outputs Typical error lt 20 ns Many options See list of options in this brochure compared to UTC Jitter lt 300 ps Custom built options available upon request e Low Phase Noise e g 133 dBc Hz at 10Hz High quality design General Description The GPSIORBN is a 10 MHz GPS disciplined rubidium frequency standard It combines the short term stability of an atomic rubidium oscillator with the long term stability and traceability of the Global Positioning Service GPS set of satellites The GPSIORBN achieves short and long term frequency accuracy of parts in 10 Thus the GPS10RBN
5. SB Interface The RS232 interface allows complete control and interrogation of the GPSIORBN Optional USB or Ethernet adapters allows the GPSIORBN to be controlled via the USB port of the PC or from a network 5 1ORBN Precision Test Systems Ltd England Web www ptsyst com AC Input 100 240 VAC 47 63 Hz 100W Mox CE ae ir CI OKO OOD E E EDIOROROEORORD Fuse 3 15 A Sine1 Sine2 Sine3 Sine4 SineS SineG Sine 7 SineS Sine 9 SinelO B 250 V GPS10RBN Rear panel Options The GPSIORBN has many options enabling it to work in varied applications Not all options can be installed at the same time Some options require a separate case Some of the options are listed below Option 01 and 02 Second Frequency Output 0 to 500 MHz spot frequency and 500 to 1 GHz spot frequenc This option gives a second frequency output The frequency is fixed and cannot be changed The spot frequency must be advised by the customer prior to manufacture The frequency can be in the range 0 to 1 GHz Some examples are shown below O1A 500 MHz Squarex1 OIE 10 24MHzSinex5 OIJ 5 MHz Sine x 5 OIN OIB 100 MHz Sine x 1 OIF 8 0 MHz Sine x5 OIK 1 MHz Sine x5 OIP OIC 10 23 MHz Sine x5 01G 100 MHz Sine ULN OIL 100 kHz Sine x 5 01Q OID 10 24MHzSinex1 OIH 16 MHz Sine ULN OIM 5MHzx5LN OIR Option 02Aand option 02B Second Variable Frequency Output 780 to 820 MHz or 800 to 1200 MHz This option gives a second frequency output The frequency is variable and can b
6. e changed from 780 MHz to 820 MHz or 800 1200 MHz in 100 kHz steps The frequency output has good phase noise and low spurious Option 03 Second Frequency Output 1 GHz to 3 2 GHz spot frequency This option gives a second frequency output The frequency is fixed and cannot be changed The spot frequency must be advised by the customer prior to manufacture The frequency can be in the range 1 GHz to 3 2 GHz Option 03A Second Variable Frequency Output 2 25 GHz to 2 65 GHz This option gives a second frequency output The frequency is variable and can be changed from 2 25 GHz to 2 65 GHz in 100 kHz steps The frequency output has good phase noise and low spurious Option 04 and Option 35 Antenna Amplifier Fiber Optic Link These options can be used to extend the range between the GPS antenna and the GPSIORBN Up to 300 m 1000 feet can be realized with a cable and amplifier up to 1 km 3200 feet with a fiber optic GPS link Option 05 05A and 05B DDS Signal Generator Option 05 adds a DDS direct digital synthesis signal output to the GPSIORBN The DDS output has a squarewave and sinewave output The frequency of this output is adjustable from 1 uHz to 80 MHz in steps of 1 uHz Thus this option can be used to generate the popular 2048 kHz and 13 MHz outputs often needed in Telecommunication systems The DDS output is locked to the main 10 MHz rubidium frequency oscillator Option 05A gives a higher output Option 05B adds a Sine and Cosi
7. e output that is locked to the GPSIORBN The frequency range of this output is 1 uHz to 80 MHz 1 uHz steps or 10uHz to 1640 MHz 10 uHz steps This option can be used to generate the popular 2048 kHz and 13 MHz frequencies as well as any frequency in the range 1 uHz to 80 MHz or 10 uHz to 1640 MHz Optional Time Code Output This option generates the industry standard IRIG B IRIG E and ESE TC90 time code formats Also a 48 bit BCD time code can be generated with option 16 Free Run Mode Ideal for portable applications The GPS1ORBN is normally operated with the Rubidium oscillator s 10 MHz output locked to the GPS satellite system In the event of a failure of the GPS signal for any reason the GPSIORBN will automatically switch over to free run mode In this mode the GPS1ORBN s Rubidium Oscillator still achieves Stratum 1 performance over a 72 hour period Also the GPSIORBN can be used for portable applications where a satellite signal is not available or the time required to lock the GPSIORBN is not available When the GPSIORBN is powered up it can be set to the free run mode The Rubidium Oscillator remembers the last known good frequency setting and adjusts itself to this frequency Thus an accurate 10 MHz is available within a few minutes of switch on This mode is ideal for setting up GSM base stations that require an accurate time base for frequency measurement GPS10RBN Brochure Precision Test Systems Ltd 1997 2011 RS232 and U
8. exceeds the requirements of a Stratum 1 level frequency standard Options for the GPSIORBN include 5 10 or 15 isolated sinewave outputs an antenna amplifier or fiber optic GPS link enabling the antenna to be placed up to 1 km from the GPS1ORBN various fixed high frequency outputs alarm relay outputs redundancy battery backup supply time code outputs and a variable frequency output Rubidium for the price of an OXCO Oscillator The GPS1ORBN incorporates an atomic rubidium oscillator as the main frequency reference but costs the same as some competitive units that use less accurate crystal oscillators The rubidium used in the GPSIORBN is 30 times more stable than any OXCO available Therefore the GPS10RBN achieves a frequency stability of typically 7 x 107 in 1000 sec Frequency Standards that use a crystal oscillator as the main reference can only achieve this stability when measurements are averaged over one week or one month This enables the GPS1ORBN to be used as a frequency reference for GPS10RBN Brochure Precision Test Systems Ltd 1997 2011 frequency counters etc and measurements can be made in seconds not days or weeks as is the case for crystal oscillator based units Accurate Timing Outputs There are two 1 pps pulse per second outputs that are derived from the GPS receiver or the rubidium oscillator The 1 pps signal from the GPS receiver is aligned to UTC with less than 20 ns error The pps from the rubidium is also
9. l to Channel Isolation Connector Frequency Accuracy Signal Type Amplitude open circuit 50 ohm Connector Frequency Signal Type Amplitude open circuit Amplitude 50 ohm Accuracy to UTC time GPS 1 pps output Jitter of Rubidium Osc 1 pps output Connector Frequency Accuracy Signal Type Amplitude Harmonic Distortion At 1 Hz Offset At 10 Hz Offset At 100 Hz Offset At 1 kHz Offset At 10 kHz Offset At 100 kHz Offset Specification Remarks 10 MHz Outputs Rear panel BNC socket 10 MHz Refer to Allan Deviation section Sine wave 0 dBm to 13 dBm 30 dBc 120 dBc gt 0 5 MHz gt 23 dB 10 MHz gt 130 dB gt 90 dB Internally adjustable Squarewave Output Option 30 required Rear panel BNC socket 10 5 2 1 0 1 MHz and 1 pps Refer to Allan Deviation section Square wave 0to5 V 2 7V TTL Compatible 1 PPS Outputs Rear panel BNC socket 1 pulse per second Pulse Output 0 to5 V TTL Compatible 0 to gt 2 5 V TTL Compatible lt 20 ns 6 sigma lt 300 ps Slave Output Option 32 required Rear panel BNC socket Selectable by keyboard After cable delays taken into account 10 MHz Refer to Allan Deviation section Sine wave gt 3 dBm Fixed level output 20 dBc ypically 40 dBc Phase Noise Response Guaranteed Typical 10 MHz Outputs 90 95 dBc Hz 130 134 dBc Hz 150 152 dBc Hz 155 159 dBc Hz 158 161 dBc Hz 158 161 dBc Hz
10. le Option 37 Guaranteed Phase Noise Specifications Phase noise plots of every output included Option 38 NTP Server NTP Server Output Option 39 2 RS232 Port A second RS232 port to be used with various options freeing up original interface Option 40A and 40 B External Locking Inputs Allows GPSIORBN to be locked to external 10 MHz or 1 pps signals Option 42 Different Connectors The standard BNC connectors can be replaced with TNC SMA or other types GPS10RBN Brochure Precision Test Systems Ltd 1997 2011 Applications Applications of the GPSIORBN include but are not limited to the following examples Portable frequency standard Space Measurements High Quality of Construction Reference frequency source in a calibration or standards laboratory Calibration of GSM Base Station Clocks Reference Frequency and Time source for the electricity generating industry Synchronizing of telecommunication and computer networks The GPS1ORBN is made to the highest standards A purpose built aluminum 19 rack mount case houses all the circuits inside the GPSIORBN The GPS1ORBN is CE marked for sale within the EEC Active Antenna Supplied as Standard The GPS10RBN is supplied with an active antenna This small unit can be easily fitted to buildings roofs etc GPS10RBN Specifications Description Connector Frequency Accuracy Signal Type Amplitude Harmonic Distortion Spurious Return Loss Reverse Isolation Channe
11. nd Output types Mark Space Ratio IRIG B Output type IRIG B Impedance lt 5x10 per month lt 5x10 GPS Receiver 12 parallel 1575 42 MHz lt 50 s typical lt 25 m 79 dBm 1575 42 MHz Active micro strip patch WGS 84 Miscellaneous 0 C to 50 C 20 C to 60 C lt 2x 10E for 1 Gauss field reverse IEC320 power cord 100 240 VAC usable 90 260 VAC 100 watts max warm up 50 watts typical operating 3 15A 250 VAC slow blow type 482 6 mm x 323 mm 88 mm and 7 kg Active type 5V 20 mA IEC320 type 1 uHz to 80 MHz in 1 uHz steps 300 uHz plus main 10 MHz error 10 kHz to 80 MHz gt 0 dBm into 50 Q 40 dBc and 20 dBc respectively 1 uHz to 80 MHz OV to 3V nominal into open circuit 25 10 IRIG B or IRIG E or ESE TC 90 3 3 to J TTL or AM 2 7 V p p 600 Q All other options After 30 days operation 0 C to 50 C Simultaneous operation L1 Frequency ith current position time data No SA 1 sigma pos hold mode Measured at active antenna input Powered by GPS1ORBN Rear Panel arm up period is lt 10 minutes at 20 C Option 05 DDS Generator Output sable to 90 MHz Subject to jitter specification Option gt 10 dBm available opt 05A se 50 ohm termination above 1 MHz gt 0 dBm into 50 Q 10 kHz 80 MHz Output 09 IRIG Time Code Output Internally selectable Internally selectable Consult Precision Test Systems for further details
12. ne outputs in place of squarewave output GPS10RBN Brochure Precision Test Systems Ltd 1997 2011 Option 06 RS232 Cable The RS232 cable connects the GPS1ORBN to a PC enabling control and interrogation of the GPS1ORBN by the PC Option 07 07A and 07B Alarm Relay TTL Output This option adds an alarm output Option 07 and 07A add a dual changeover relay that is activated in the event of an alarm Each relay contact is rated at 30 VDC and 1 Amp 5A for Option 07A Option 07B is a TTL output signal only Option 08 Redundancy Option 08 adds redundancy With this option two GPSIORBN s can be configured into a redundancy set up with five main 10 MHz outputs up to 15 outputs optionally available Normally one unit will supply the 10 MHz outputs locked to the GPS satellite In the event of failure of this unit the 10 MHz outputs will be automatically switched to the second GPS10RBN unit The second GPSIORBN unit will then supply the 10 MHz outputs locked to the GPS system Even if both GPS antennas are disconnected and one unit completely fails there will still be a 10 MHz from the second unit running from the rubidium oscillator Both units are identical there is no master or slave Simply whatever unit is healthy will supply the 10 MHz output System status is available via the RS232 interface This option is ideal for applications that require extra security Extra 10 MHz outputs can be added if required Option 09 IRIG B Outpu
13. newave outputs to 5 MHz instead of 10 MHz A 10 MHz output is still available Option 25 USB Adapter Allows GPS1ORBN to be controlled from a USB port of a PC Option 26 Low Phase Noise Option This option gives a low phase noise output Normally the frequency is 10 MHz but any frequency from 1 to 100 MHz can be supplied This output is phase locked to the main rubidium output Option 28 Control of GPS10RBN over the internet Ideal for remote monitoring of the GPS1ORBN Option 30 30A 30B Squarewave and Pulse Outputs Opt 30 Squarewave Output Gives a TTL output switchable in frequency to 10 5 2 1 0 1 MHz and 1 pps Opt 30A 5 x squarewave outputs at MHz other frequencies available Opt 30B Pulse Output 5 x pulse outputs each can be individually set to 1 PPS 10 PPS 100 PPS 1k PPS or 10k PPS Option 32 Slave Output Adds a slave 10 MHz output This can be used to connect further distribution amplifiers to the GPSIORBN Option 33 Carrying Case A plastic carrying case with foam insert is used to carry and protect the GPSIORBN Option 34 High Power Outputs The 10 MHz output levels are increased to a maximum of 20 dBm Option 35 Fiber Optic Link for Antenna Allows GPS Antenna to be located up to 1 km away from GPS1ORBN Option 36 Fiber Optic 10 MHz Output This option adds a fiber optic output together with a fiber optic receiver This allows the 10 MHz output to be routed over very long distances using fiber optic cab
14. of other options Not all options can be fitted at the same time Head Office UK Precision Test Systems LTD 40 Holkham Avenue South Woodham Ferrers Essex CM3 7AU England Tel 44 0 870 368 9608 Fax 44 0 1245 330030 Email uksales ptsyst com Web www ptsyst com South Africa Precision Test Systems cc Gauteng South Africa Fax 08651 58198 Email sasales ptsyst com Web www ptsyst com USA Precision Test Systems 14781 Memorial Dr Suite 981 Houston Texas 77079 USA Tel 1 888 876 4804 Fax 1 832 201 6564 Email usasales ptsyst com Web www ptsyst com Specifications and features subject to change without notice 290311 GPS10RBN Brochure Precision Test Systems Ltd 1997 2011
15. t This option gives the industry standard IRIG B or IRIG E time code output The output can be internally set to give an AM modulated signal or TTL output Option 11 Clock Date Display Unit Option 11 provides a remote Clock Date display The display consists of a 6 digit 25 mm high digital LED display that can be read from a distance of 10 meters The display can be located remotely from the GPSIORBN The display requires a cable connection from the GPSIORBN although a wireless unit is available on special order Option 12 Additional sinewave outputs The GPS10ORBN has five isolated 10 MHz sinewave outputs Option 12 adds a further five making ten in total Option 12C adds a further ten making fifteen in total Option 12A 10 23 MHz Outputs This option changes the five sinewave outputs to 10 23 MHz A rear panel input connector allows the DDS option option 05 to generate 10 230 MHz and be available on these five isolated outputs Option 13 Mute Sinewave Outputs in the event of an alarm This option disables all the sinewave outputs in the event of an alarm or error Option 14 Service manual The service manual has service information and realignment procedures Option 15 Windows Software This windows software operates on Windows 2000 XP Vista It allows all the main parameters of the GPSIORBN to be monitored and recorded by the PC Option 16 BCD Time Code Output This option gives a 48 bit BCD time code output The time ou
16. tput is in the format HH MM SS sssssss The fractional seconds have a resolution of 100 ns The output is updated every 100 ns and is accurate to UTC to within 200 ns Option 17 DDS Generator 0 to 400 MHz This option adds a DDS generator that can operate from 0 to 400 MHz in 0 1 Hz steps Option 18 Ethernet Port This option adds an Ethernet port This allows the GPS1ORBN to be controlled and monitored via an Ethernet network or internet GPS10RBN Brochure Precision Test Systems Ltd 1997 2011 Option 19 24VDC Input This option allows the GPSIORBN to be externally powered by a 24 VDC supply at 5 amps In the event of AC power being lost the GPSIORBN will instantly switch over to the external 24 VDC supply supply not included Option 20 2 048 MHz G703 10 output This option gives the popular 2 048 MHz output The output is a squarewave with amplitude of 1 2 V in 75 Q Option 21 Lightening Protection This option adds lightening protection to the antenna input The protection is placed close to the GPS antenna Option 22 0 to 1640 MHz DDS Output This option adds a DDS output The output can be set anywhere from 0 to 1640 MHz in 10 uHz steps Option 23 GSM Interface This option enables the GPS1ORBN to send a SMS short message service or text to ten GSM mobile phones in the event of an error Option 24 Frequency Change to 5 MHz also requires option 12 additional 5 outputs to be installed This option changes all si
17. y adjusted from 0 dBm to 13 dBm Reverse isolation of each output is 130 dB and channel to channel isolation is typically 90 dB Five outputs as standard Up to 15 outputs can be optionally installed Optional output level to 20 dBm is available Optional square wave output that can drive TTL levels into a 50 Q load impedance The frequency of the square wave can be set to 10 5 2 1 0 1 MHz and 1 pps via the front panel keyboard Dual one pulse per second outputs These 1 pps outputs are either derived from the GPS receiver or from the rubidium receiver The leading edge of the GPS pps signal is aligned to UTC time 20 ns The Rb 1 pps output signal has very low jitter of lt 300 ps These outputs can drive TTL levels into 50 Q A slave 10 MHz output is optionally available to connect more distribution amplifiers such as the DA1 100 10 to the GPSIORBN Thus it is possible to get multiple 10 MHz outputs that can be used to provide 10 MHz reference signals to an entire building or workshop for example Up to 1000 outputs can be realized all delivering a low phase noise output Optional high frequency outputs can be specified at the time of ordering These fixed high frequency outputs can be as high at 10 GHz higher frequencies available upon special request and are phase locked to the main frequency reference Note this option only generates one fixed frequency Optional DDS Output enables the GPS1ORBN to produce a sinewave and squarewav
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