GPS-Disciplined Rubidium/OCXO Clock
Contents
1. J6 RS 232 communication to PC 9 pin D type connector signals Pin Number Function 2 CLI Tx to PC RS 232 19 200 baud rate 1 8 1 no parity default 3 CLI Rx from PC 5 GND 1 4 6 7 8 9 Not used J7 Auxiliary Time Frequency communication and miscellaneous 44 pin D type connector signals With this connector the customer can get additional outputs such as 1PPS 10PPS and more TTL or RS 422 additional square wave frequencies TTL or RS 422 TOD Time of Day in NMEA or IRIG B DC or other formats CLI communication in RS 422 and Overall BIT indication Please note that in the table below outputs of pins 6 13 16 19 26 30 and 32 35 are offered as option Pin Function Pin Function 1 CLI IN RS422 23 GND 2 CLI IN RS422 24 FACTORY USE Lock signal 3 CLI_OUT RS422 25 GND 4 CLI_OUT RS422 26 TOD 1 TTL 100kohm 5 GND 27 TOD 2 TTL 100kohm 6 X PPS RS4224 output 1 28 TOD 3 TTL 100kohm 7 X PPS RS422 output 1 29 TOD 4 TTL 100kohm 8 Y PPS RS422 output 2 30 TOD 5 TTL 100kohm 9 Y PPS RS422 output 2 31 GND 10 Z PPS RS422 output 3 32 1PPS 1 TTL 50ohm output 11 Z PPS RS422 output 3 33 1PPS 2 TTL 50ohm output 12 W PPS _RS422 output 4 34 1PPS 3 TTL 50ohm output 13 W PPS2. TOD from Display key pad TOD amp Navigation RS232 Control 10 MHz Rubidium Clock MATRIX Outputs Divide by Detector mus Ext 1 PPS TOD Reader GPS Receiver TOD 1 PPS DATA 1PPS 9 Priority Gate Other Frequencies AR76A DATA SHEET REVISION 31 12 2013 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE THE BINDING SPECIFICATIONS ARE ONLY THOSE STATED IN OUR QUOTATION PROPOSAL CONTRACT AccuBeat Ltd http www accubeat com lt Accurate Frequency amp Time Accurate Time amp Frequency System Model AR76A All specs are 25 C quiescent conditions and sea level ambient unless otherwise specified Precision Time Protocol option IEEE 1588 2008 V2 Grandmaster Slave Multicast Unicast modes of operation UDP IPv4 L2 or L3 Design to handle up to 200 slaves simultaneously Accuracy lt 1us network dependency In the following figure two AR76A units are interconnected via a network one as a master and one as a slave The time interval between the two 1PPS outputs was measured over time and the results are shown in the plot below PTP performance measurement setu Hi resolution counter Time interval counter 1PPS TERT AR76A PTP Slave AR76A IE lt E TI ns 100 90 80 70 60 50 40 30 20 10 0 Time seconds 0 17100 34200 51300 68400 Time hours 0 4 75 9 5 1
3. CIA type 3148100N 03512687E 7713 AAR Eobied JAT Embed CIIRIOBYeer Output IPPS 4 ore aj CA9 349 2Ensbled A9 3 Enabled Sat in view HDOP VDOP PDOP TDOP de Type TFOM Threshold Time Source Type NTP Mode Time interval Rubidum 0 A9 1 Start date Stop date epp Tis To p fis fis Tie 3 T5 T uu mus m 087 Input TOD UTC Time Mess interval abere Display mode Display Timeout CLI Time interval 49 2 DDS Freq DDS Factor Time interval ON 60 un 0 9 3 10000000 000000 1 ODDS Enbie VER AR 6A 4 SN 0000 A2 S W Ver01 20 A2 HIW Ver07 A3 H W Ver N A A5 SW Ver02 41 A5 HW Ver13 A7 SW Ver N A A9 SW Ver NIANIA NIA AR76A DATA SHEET REVISION 31 12 2013 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE THE BINDING SPECIFICATIONS ARE ONLY THOSE STATED IN OUR QUOTATION PROPOSAL CONTRACT AccuBeat Ltd http www accubeat com lt Accurate Frequency amp Time Accurate Time amp Frequency System Model AR76A All specs are 25 C quiescent conditions and sea level ambient unless otherwise specified Electrical ICD Connector Description Standard Type Options J1 Power supply AC Standard Inlet IEC320 28VDC 48VDC J2 GPS antenna TNC Female J3 J5 LAN RJ 45 J6 CLI D9 Female J7 Additional I O D type 44 pin Female J8 J17 Coax outputs BNC Female TNC Female J18 J19 Inputs BNC Female TNC Female
4. lt Accurate Frequency amp Time Accurate Time amp Frequency System Model AR76A GPS Disciplined Rubidium OCXO Clock eg on 257 m3 22133 Qj i GPS RUBIDIUM CLOCK AR73A puc e SS eee 9 i 9 Key features Frequency Accuracy 1E 12 Options 1PPS Accuracy 20ns RMS Up to 3 channels LAN interface Holdover 1us 24 hours 5E 11 month SNMP Monitor amp Control Custom MIB 20 outputs 10MHz 1PPS TOD IEEE 1588 PTP Grandmaster LAN IPV4 NTP V3 Monitor amp Control DHCP DDS Up to 30MHz 32 bit resolution External 1PPS Frequency input for disciplining Supply Voltage DC or DC amp AC 12 channel C A code GPS receiver Graphic User Interface GUI Software for PC Front Panel Display Time Date BIT and more TOD Format IRIG B NMEA IRIG A NASA 36 Monitor amp control RS232 UDP P Y code SAASM GPS receiver Supply Voltage 90 260 VAC Delay Correction for Input amp Output X d i X d i X d i X q KS i 64 S 4 X d i v X d i X d Ke e 0 Description The AR76A is a multi function GPS Disciplined Rubidium Atomic Clock which provides accurate time amp frequency The AR76A incorporates numerous features into a single box including a Rubidium Frequency Standard an internal C A code 12 channels GPS receiver and an input fro
5. lt 45 second Cold start lt 50 second worst case 5VDC up to 100 mA Position Accuracy Acquisition Time Typical GPS Antenna DC Voltage The acquisition time refers to the GPS receiver output For frequency stabilization during Warm up see above Environmental Operating Temperature 20 C to 65 C Storage Temperature 20 C to 70 C Humidity Up to 95 at 35 C non condensing Vibration 2 50 RMS Safety Safety Standard CE safety Power Supply Power Supply 90 260 VAC 47 63 Hz Option DC power supply 28VDC 4V 48VDC Power Consumption 35W Warm up 20W Steady state Options for power supply redundancy Power Supply Redundancy option 1 Two power supply inputs one for AC and the other for DC 2 Two DC power supply inputs Front panel display amp indications and GUI The LCD front panel display and buttons enable the user to view and configure most parameters The displayed information includes the Time Date BIT GPS parameters antenna Display current satellite status and more Configured parameters include time synchronizations source 1PPS delay outputs configuration and more For details see user manual or contact factory Florescent display is available as an option instead of the LCD display LED Indications 4 LEDs on the front panel Power Overall BOT TOD Source 1PPS FREQ Source o Time date display o IP address configuration Graphic User Interface GUI option
6. 4 25 19 Time accuracy lt 50ns RMS AR76A DATA SHEET REVISION 31 12 2013 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE THE BINDING SPECIFICATIONS ARE ONLY THOSE STATED IN OUR QUOTATION PROPOSAL CONTRACT AccuBeat Ltd http www accubeat com lt Accurate Frequency amp Time Accurate Time amp Frequency System Model AR76A All specs are 25 C quiescent conditions and sea level ambient unless otherwise specified Performance with OCXO as local oscillator instead of Rubidium Mode of work Disciplined to GPS or to external 1PPS Free running Rubidium T 1 ms 24 hours typical Time 1PPS 1 RMS rel 2 ime RMS relative Input aes After 24 hours of disciplining Accuracy lt 1E 11 lt 2E 8 month after 30 days of operation Short Term Stability 3E 11 1 ADEV Temperature E Stability 200 ppb over 20 C to 70 C 85dBc Hz 1Hz Frequency Phase Noise 115dBc Hz 10Hz 10MHz lt 130dBc Hz 100Hz 135dBc Hz 1KHz Harmonics 10MHz Spurious 10MHz lt 100dBc 100 2 Warm up time 1E 11 within lt 24 hrs lt 48dBc The above figures are given for the J17 output Some degradation may occur for other outputs AR76A GUI Time report screen BIT Report screen AR76A RS232 GUI E azea Rs232 cui AccuBoeat gt AccuBeat Time Report Time Setup amp BIT Report C
7. 76 Xs Xs Xo Options 0 No other optins standard __ 1 LAN UDP ASCII format similar to AR73A 16 2 High resolution TIC measurement 3 10PPS Outputs Oscillator Type PTP R Rubidium standard 0 No PTP standard X OCXO P PTP Grand master Power Supply AUX Time Codes A AC standard 0 No AUX time protocol 28VDC 48 VDC N NMEA D 48 VDC x 2 A Almanac amp Ephemeris LAN Interfaces Time Codes 0 No LAN 0 No time code standard 1 1xLAN interface NTP UDP standard E 4 Have Quick GPS ICD GPS 060 2 2xLAN interface NTP UDP 1 IRIG AM 3 3 x LAN interface NTP UDP A Have Quick and IRIG B AM B IRIG B AM amp DC Coaxial outputs configurations J8 J17 AUX outputs configurations A 10MHz sine 1PPS 44 pins D Type connector B 1x10MHz sine 1 x 1PPS 8 x 2 048MHz C 10MHz sine 1 x 1PPS Events inputs A A and B 0 No AUX outputs on this connector standard D 10MHz 1PPS 10PPS IRIG B A 4 x 1PPS pins 32 35 E IES RIG E GM B AUX with fast UART for TIC measurement F 10MHz 1PPS IRIG B AM x 4 IRIG B DC x 4 C 4 x 1PPS RS422 outputs S Customized special configuration amp frequency the final part number will be define before PO The user can configure the outputs by using a CLI command Contact factory S
8. MHz 44 pin D Type TOD NMEA Connector e PV4 EEE 1588 PTP Grandmaster slave one output e NTP server V3 per RFC1305 e Up to 3 independent LAN ports 3 NTP servers or 2 NTP LAN lt 1ms each LAN board can support up to servers and one PTP 1100 NTP requests per second Each one has a different IP address serving three e DHCP separates networks e Control amp Monitoring UDP e SNMP V3 Custom MIB CLI RS 232 port single ended or RS 422 remote control Contact factory for detail d 10MHz Vv GPs 1PPS Antenna Configurable Outputs x 8 External Differential 1PPS 1PPS frequency AR76A 1PPS PTTI TOD 7 TOD PTTI 5 422 Power Supply NMEA Supply Lg Ht LAN ports 1 3 RS 232 AR76A DATA SHEET REVISION 31 12 2013 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE THE BINDING SPECIFICATIONS ARE ONLY THOSE STATED IN OUR QUOTATION PROPOSAL CONTRACT AccuBeat Ltd http www accubeat com lt Accurate Frequency amp Time Accurate Time amp Frequency System Model AR76A All specs are 25 C quiescent conditions and sea level ambient unless otherwise specified Performance with Rubidium Frequency Standard as the local oscillator Mode of work Disciplined to GPS or to external 1PPS Free running Rubidium 1 us 24 hours typical Time 1PPS 20ns RMS relative inpu
9. RS422 output 4 35 1PPS 4 TTL 50ohm output Over all BIT open collector 100mA GND a Low OK High impedance fail 15 5 5V internal 3000 series resistor 37 GND 16 AUX Frequency RS422 OUT 1 38 Default 10MHz AUX Frequency RS422 OUT 1 17 Default 10MHz 39 FACTORY USE 18 AUX Frequency RS422 OUT 2 40 Default 10MHz AR76A DATA SHEET REVISION 31 12 2013 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE THE BINDING SPECIFICATIONS ARE ONLY THOSE STATED IN OUR QUOTATION PROPOSAL CONTRACT AccuBeat Ltd http www accubeat com lt Accurate Frequency amp Time Accurate Time amp Frequency System Model AR76A Pin Function Pin Function 19 AUX Frequency RS422 OUT 2 41 Default 10MHz 20 GND 42 21 NMEA RxD RS 232 43 22 NMEA TxD RS 232 44 Mechanical ICD Front panel a us VENUES O Rear panel AR76A DATA SHEET REVISION 31 12 2013 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE THE BINDING SPECIFICATIONS ARE ONLY THOSE STATED IN OUR QUOTATION PROPOSAL CONTRACT AccuBeat Ltd http www accubeat com lt Accurate Frequency amp Time Accurate Time amp Frequency System HOW TO ORDER Model AR76A AR
10. ar Base Stations Scientific Equipment Secure Communication Mobile Radio Base Stations AR76A DATA SHEET REVISION 31 12 2013 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE THE BINDING SPECIFICATIONS ARE ONLY THOSE STATED IN OUR QUOTATION PROPOSAL CONTRACT AccuBeat Ltd http www accubeat com lt Accurate Frequency amp Time Accurate Time amp Frequency System Model AR76A All specs are 25 C quiescent conditions and sea level ambient unless otherwise specified Basic Configuration Options Other combinations of the following signals are available upon 5 x Sine Wave 10 2 dBm request 5 x 1PPS TTL 50O Frequency 1MHz 5MHz 2 048MHz sine or square and others BNC DDS frequency 1KHz 30MHz Connectors The user can set other outputs TOD IRIG B additional formats are also available configurations see S W ICD Have Quick NMEA Other combinations of the following signals are available upon request Outputs Frequency 1MHz 5MHz 2 048MHz sine or square and more other frequencies DDS frequency 1KHz 30MHz 44 pins D Type TOD NMEA Connector 4x 1PPS RS 422 2 x 10MHz RS 422 Ax 1PPS ICD GPS 060 5 x TOD ICD GPS 060 Have Quick H W BIT open collector For Time and Frequency Disciplining BNC Frequency 1MHz 2 048MHz 5MHz and more Connector 1PPS TTL 50O or ICD GPS 060 TOD IRIG B more formats are available as well Inputs e 10
11. m external 1PPS frequency The various options of the unit include a variety of different frequencies and several Time Codes outputs The Rubidium Standard functions as a local oscillator and is phase locked to the GPS or to external inputs All outputs are derived from the Rubidium Clock which maintains accurate time and frequency when GPS or other inputs are interrupted For low cost applications an Oven Control Crystal Oscillator OCXO is offered instead of Rubidium Frequency Standard The unit includes up to three physical LAN interfaces boards which support UDP SNMP for management and for NTP Network Time Protocol The three LAN boards can be used for three different networks with three different IP network addresses or for two networks where the 3rd LAN board is reserved as a redundant back up A Precision Time Protocol is available with one of the LAN board The AR76A provides multiple outputs 10 coax outputs two fixed 10MHz and 1PPS and 8 configurable outputs which can be selected from 1PPS 10MHz and more Additional outputs are available on the D Type connector including differential RS422 outputs TOD Time Of Day outputs with several standard protocol like NMEA IRIG B etc and more The unit is 19 x 1U rack mountable encasement Note Have Quick Time Code and an option for P Y SAASM GPS receiver are available in model AR77A Contact factory for details Applications Test Equipment Telecommunication Cellul
12. o Satellites in view o Antenna cable delay o Navigation data from GPS and o External input and 1PPS output delay The GUI is software for PC used for o BIT Built In Test o Matrix configuration maintenance and as a starter kit o Time source amp Time zone o Time setting GPS UTC o Leap seconds from UTC to GPS o Additional parameters AR76A DATA SHEET REVISION 31 12 2013 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE THE BINDING SPECIFICATIONS ARE ONLY THOSE STATED IN OUR QUOTATION PROPOSAL CONTRACT AccuBeat Ltd http www accubeat com lt Accurate Frequency amp Time Accurate Time amp Frequency System Model AR76A All specs are 25 C quiescent conditions and sea level ambient unless otherwise specified Principles of Operation The following block diagram describes the operation of the AR76A The unit includes Rubidium Clock and accepts inputs from either internal GPS receiver or external 1PPS amp TOD sources All outputs are derived from the internal Rubidium Clock which is phase locked via a digital PLL to the internal GPS receiver or to one of the external inputs This way the Rubidium Clock follows the GPS long term accuracy and cleans the jitter and the noise on the short and medium terms When the GPS reception is lost for short or long periods of time the Rubidium continues to maintain accurate time and frequency LCD Display TOD Generator TOD IRIG HQ NMEA LAN
13. onfiguration amp Matrix Setup IPPS PTTI Output status 3 Time Report Time Setup amp Report Configuration amp Matrix Setup IPPS PTTI Output status Ls BIT Report G T 9 25 Time amp Date General BIT File Description e GPS Input Ext TOD A9_1 Status 25V A era Seve mes m ico Sees mE JE L c Read Parameters di pm indicat Ext IPPS2 Ext NMEA 9 3 Status 15 Good B Quay indicator Table of content BIT a No message Day Time Date Time mode GPS offset TFOM In Q In anal Antenna Status Start Date Stop Date Automatic 1 PIPIPPS Ext CLI 2 a No applicable 338 09 11 39 00 03 12 2012 9 36 E E No MSc Antenna Current sees Tene Source Sync Source Chore Teme Ext freq PTP Time 12V GPS Input mm Ex TOD 4 24 m 3 m ra BIS GPS WEN Ex IPPS IPPSIRIGB Exit Good Last Time Source Last Sync Source mm Ext 1PPS2 Ext NMEA Setup Report Hold over Hold over NEN PPS mm Ext CLI Time Source IPPS Source Time Mode Antennna Delay Ext IPPS 1 Delay Ext IPPS 2 Delay Selected Time Source Selected Sync Source NEN Ext Freq Ext PTP Ax 0 80 Aa 8 vc gm gz UN GPS offset Leap second Set Altitude Time Zone IPPS Delay PTP IPPS Delay Output Delay P d mien tunm icr mem GEGRAMU GI Avg SON 8 ga
14. pecial frequencies like 120MHz are also available per request Contact factory Note P Y SAASM GPS receiver are available in model AR77A Contact factory for details AR76A DATA SHEET REVISION 31 12 2013 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE THE BINDING SPECIFICATIONS ARE ONLY THOSE STATED IN OUR QUOTATION PROPOSAL CONTRACT AccuBeat Ltd http www accubeat com
15. t After 24 hours of disciplining Long Term Stability lt 1E 12 lt 5E 11 month Standard Improved option Short Term Stability 11 1 ADEV 3 ee Contact factory for information 5E 12 100s Temperature P Stability 3E 10 over 20 C to 65 C Standard typical Improved option 80dBc Hz 1Hz Frequency Noise 114dBc Hz 10Hz 10MHz 140dBc Hz 100Hz s 146dBc Hz 1KHz 147dBc Hz 10KHz Contact factory for information Harmonics 10MHz lt 48dBc Spurious 10MHz lt 100dBc 100KHz Warm up time Rubidium Lock 4 minutes 5E 11 within 60 minutes 1E 11 within 4 hrs 1E 12 within 24 hrs The above figures are given for the J17 output Some degradation may occur for other outputs SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE THE BINDING SPECIFICATIONS ARE ONLY THOSE STATED IN OUR QUOTATION PROPOSAL CONTRACT AR76A DATA SHEET REVISION 31 12 2013 AccuBeat Ltd http www accubeat com lt Accurate Frequency amp Time Accurate Time amp Frequency System Model AR76A All specs are 25 C quiescent conditions and sea level ambient unless otherwise specified _ GPS C A Code Receiver L1 frequency 1575 MHz C A code SPS 12 parallel tracking channels Available on 44 pin D Type connector option Latitude Longitude lt 6m CEP 50 Altitude 11m CEP 50 Warm start
Download Pdf Manuals
Related Search