Summary of Contents for Safran RbSource-1600-dual
- Page 1 ELECTRONICS & DEFENSE RbSource-1600-dual High-Performance Rubidium Reference Dual Source User Manual RbSource-1600-dual User Manual Page 1 of 26 Revision: 200924 20 September 2024...
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Page 2: Table Of Contents
RbSource-1600-dual User Manual, Rev 200924 Contents Introduction ..........................4 Revision list ..........................4 Definitions ........................... 5 Getting Started ......................... 5 4.1. Unpacking ................................. 5 4.2. Safety! ................................. 5 4.3. Environmental Responsibility ........................6 4.4. Installation Procedure ..........................6 4.4.1. Connections ..............................6 4.4.2. - Page 3 RbSource-1600-dual User Manual, Rev 200924 7.4.1. Center frequency read-back ....................... 16 7.4.2. SYNTH out frequency setting ......................17 7.5. Commands of setting & control ......................17 7.5.1. Commands of Timing &Tracking ....................... 17 7.5.2. Commands of timing Set-up ....................... 19 7.5.3.
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Page 4: Introduction
RbSource-1600-dual User Manual, Rev 200924 1. Introduction The RbSource-1600-dual has been specifically designed for telecom infrastructure, requiring extremely stable and precise timing or frequency source and low phase noise. The RbSource-1600-dual integrates two smart GPS-disciplinable SRO-5680 Rubidium clock, and distributes multiple output signals, either phase or frequency aligned depending on the operating modes. -
Page 5: Definitions
RbSource-1600-dual User Manual, Rev 200924 3. Definitions This is a list of words and related definitions used in this manual to help the user understand the content: Words Definitions RbSource-1600-dual Unit or product Unit RbSource-1600-dual System RbSource-1600-dual and its integrated modules... -
Page 6: Environmental Responsibility
The equipment contains materials, which can be either re-used or recycled. • Do not deposit the equipment as unsorted municipal waste. Leave it at an authorized local WEEE collection point or return to Safran Trusted 4D to ensure proper disposal. • To return the appliance: Submit a support ticket to https://safran-navigation-timing.com/support-hub/... -
Page 7: System Operations
5. System Operations 5.1. Operating Modes The RbSource-1600-dual integrates a smart SRO rubidium clock and a GPS receiver. It provides 4 basic modes of operation as follows: 1) Free Run: When the Rubidium clock is not locked to a GPS reference and, thus, is free... -
Page 8: Operating Mode Setup
3) Sync: When the GPS reference is used to perform phase alignment applications. The PPSOUT of the RbSource-1600-dual is aligned in phase with the GPS PPSREF input through the internal PPSINT reference signal, which uses the SmarTiming+™ algorithm to 1) compare the PPSOUT against the PPSREF signal at 1ns resolution within a +/-500ns dynamic range and 2) auto-adaptively align them. -
Page 9: System Description
RbSource-1600-dual User Manual, Rev 200924 6. System Description The RbSource-1600-dual unit consists of a GPS receiver disciplined to a smart rubidium clock (model SRO-100). 6.1. Principle of Operation The Rubidium atomic clock essentially consists of a voltage-controlled crystal oscillator (VCXO) which is locked to a highly stable atomic transition in the ground state of the Rb87 isotope. -
Page 10: Timing & Tracking System
RbSource-1600-dual User Manual, Rev 200924 The basic purpose of the electronics package is to synchronize the entering microwave frequency, derived from a quartz crystal oscillator, to this absorption dip. This is achieved by tuning the microwave frequency to maximum optical absorption. -
Page 11: Free Run, Track & Sync Modes
RbSource-1600-dual User Manual, Rev 200924 6.4.1. Free Run, Track & Sync Modes The reference module has 3 basic modes of operation: • Free Run • Track • Sync When the first mode, Free Run, is set up, the Rubidium clock is not locked to a reference. -
Page 12: User Frequency Correction
Immediate use of the new frequency 6.4.5. The PPS Tracking Loop Note: PPSREF is not connected on RbSource-1600-dual. The unit is equipped with a numerical PI regulation loop to track the PPSREF. The time constant of the tracking loop is either set automatically or forced by a user with the command TCxxxxxx. -
Page 13: Frequency Fluctuations While Tracking
RbSource-1600-dual User Manual, Rev 200924 a) If the phase time error becomes bigger than the first limit, an alarm is issued, but the tracking continues. This first limit is called “no alarm” window b) If the phase time error becomes bigger than the second limit, then the tracking stops. This second limit is called “tracking”... -
Page 14: System Communication
Example: ID<CR>, answer: TNTSRO-100/01/1.00<CR><LF> SN<CR>[<LF>] Serial number Answer: xxxxxx<CR><LF> xxxxxx: 6 digits serial number of integrated SRO-100 in RbSource-1600-dual Example: SN<CR>, answer: 000098<CR><LF> 7.2. General status of Rb clock module ST<CR>[<LF>] : General Status Answer: s<CR><LF>... -
Page 15: Monitoring Of Internal Parameters
RbSource-1600-dual User Manual, Rev 200924 0:Warming up. This happens when the system is just powered on and the temperature of the cells is not high enough. 1:Tracking set-up: The system is in this state when it goes from free-run status to the track status after a track set-up. -
Page 16: Center Frequency Adjustment Via Serial Interface
RbSource-1600-dual User Manual, Rev 200924 the internal reference 5 V voltage. The full scale corresponds to the coded value $00 and the zero (no light) corresponds to the coded value $FF • Frequency adjustment voltage. DD: VCXO control voltage (0 to 5V for $00 to $FF) This parameter corresponds to the voltage applied to the varicap of the internal VCXO. -
Page 17: Synth Out Frequency Setting
RbSource-1600-dual User Manual, Rev 200924 L05<CR>[LF] : read-back high byte of user frequ. corr. in use after RESET or power-ON. L06<CR>[LF] : read-back low byte of user frequ. corr. in use after RESET or power-ON. In track state, the value of all of these registers is subject to change by the software for optimum alignment. - Page 18 RbSource-1600-dual User Manual, Rev 200924 • When track mode is set to 1 by hardware or software, the tracking of PPSINT to PPSEXT starts when General Status goes from 9 to 4. • This command doesn't give out the actual tracking state. For that, use the command ST<CR>.(answers 2 <CR><LF>...
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Page 19: Commands Of Timing Set-Up
RbSource-1600-dual User Manual, Rev 200924 0000001: minimum pulse. 7499999: maximum pulse. 0000000: no pulse. 9999999: interrogation. Answer: ddddddd: Pulse width in 133 ns steps. Factory setting : 0001000 (133 us) Reset value : Last Value stored in EEPROM Example: PW9999999<CR>, answer: 0001000<CR><LF>... -
Page 20: Commands Of Control
RbSource-1600-dual User Manual, Rev 200924 Answer: ddddddd<CR><LF> ddddddd: delay in 133 ns steps. 2: Beat phase comparator value. Answer: sppp<CR><LF> s: +/- sign ppp: phase error, approx. in ns 3: Beat effective time interval PPSOUT vs PPSREF + phase comparator value. - Page 21 RbSource-1600-dual User Manual, Rev 200924 1: save integral part of tracking correction in EEPROM every 24 hours. (1→EEPROM) 2: save integral part of tracking correction in EEPROM now. 3: save user frequency in EEPROM now. 9: interrogation. Answer: x: frequency save mode as written in EEPROM 0: no saving.
- Page 22 RbSource-1600-dual User Manual, Rev 200924 Notes: • In auto selection mode, the time constant is automatically adapted to the PPSREF noise. • In auto selection mode, if the time interval PPSREF vs PPSINT goes out of the phase comparator range, approx. +/-500 ns, the time constant is set to 1000 s.
- Page 23 RbSource-1600-dual User Manual, Rev 200924 COsddd<CR>[<LF>] fine phase comparator offset sddd: fine phase offset in approx. 1 ns steps +000: no offset +127: highest offset -128: lowest offset +999: interrogation. Answer: sddd<CR><LF> sddd: phase offset actually in use. Factory setting:...
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Page 24: System I/O Interfaces
RbSource-1600-dual User Manual, Rev 200924 8. System I/O Interfaces Figure 8: RbSource-1600-dual Interfaces 8.1. Back plate N° Type Definition Rb A 10MHz outputs SUB-D9-F Rb A Serial communication RS232 + OOL bit alarm Rb B 10MHz outputs SUB-D9-F Rb B Serial communication RS232 + OOL bit alarm P. -
Page 25: Lock Indicator
RbSource-1600-dual User Manual, Rev 200924 9. Lock indicator 9.1. TTL or CMOS Level “Out of Lock Alarm” Signal Generation 100R Lock monitor TTL out locked: +5V unlocked: <0.4V Figure 9: The lock monitor The lock monitor can be directly connected to the TTL load, or a pull-up resistor can be added for CMOS compatibility. -
Page 26: Safran Technical Support
Information furnished by Safran is believed to be accurate and reliable. However, no responsibility is assumed by Safran for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Safran reserves the right to make changes without further notice to any products herein.
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