Product Documents & Files

Typesort descending Title Date
System Diagrams: Secure Network Synchronization System diagram for secure network synchronization based on NetClock master and 9388 Ethernet Time Server for isolated networks. pdf - 257 KB
Tuesday, October 13, 2015
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System Diagrams: Ganged GSG Simulators System Diagram Ganged GSG Simulators System Diagram pdf - 89 KB
Monday, June 2, 2014
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System Diagrams: Synchronized Communication Center System diagram with NetClock for synchronized communication center. pdf - 237 KB
Monday, June 23, 2014
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System Diagrams: GPS Master Clock with Multiple Outputs and Time Tagging System diagram showing GPS master clock with multiple outputs and time tagging. NetClock with SAS distribution. pdf - 206 KB
Thursday, July 26, 2012
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System Diagrams: Time Synchronization Solution System diagram for time synchronization solution. pdf - 219 KB
Tuesday, July 8, 2014
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System Diagrams: Hybrid Unicast/Anycast Multi-Statum NTP Network System diagram showing hybrid Unicast/Anycast multi-statum NTP network. pdf - 441 KB
Wednesday, February 18, 2015
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System Diagrams: Timing Signal Distribution Over Fiber System diagram showing timing signal distribution over fiber for long distances or crossing red/black security domains. pdf - 330 KB
Monday, November 12, 2012
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System Diagrams: IEEE-1588 Precision Time Protocol (PTP) System diagram showing SecureSync grandmaster with SecureSync and PCIe slave. pdf - 419 KB
Tuesday, June 26, 2012
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System Diagrams: Indoor GPS Location These diagrams describe the issues relating to GPS for indoor positioning and navigation. 
  • Typically you'd consider a pseudo-satellite appriach but which require a specially designed receiver
  • A GPS RF simulator could generate signals that a GPS receiver would interpret as a single (pre-programmed) position (or trajectory) which could be useful for "zone positioning"
  • A GPS repeater would do something similar but the GPS receiver would always interpret at the position of the outdoors GPS antenna
pdf - 259 KB
Wednesday, August 21, 2013
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System Diagrams: Legal EHR Diagram System diagram for legal EHR based on NetClock. pdf - 300 KB
Tuesday, November 4, 2014
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System Diagrams: Legally Traceable Time Diagram System diagram for BIPM and NIST/USNO through GPS. pdf - 3 MB
Thursday, July 26, 2012
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System Diagrams: Multiple GPS Receiver Testing System diagram for multiple GPS receiver testing. pdf - 212 KB
Friday, January 6, 2012
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System Diagrams: Alternative PNT Diagram A graphical representation of approaches to references for position, navigation and timing pdf - 597 KB
Saturday, September 26, 2015
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Technical Notes and Briefs: Kannad recommendations following Cobham SB 02/2011 and EASA AD 2011-0103: SL S18XXXXX-25-02 Rev 00 – Issue Jun. 15/2011 pdf - 214 KB
Wednesday, June 15, 2011
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Technical Notes and Briefs: SB S1840502-25-01 Rev02 Kit Mounting bracket Compact - Strap Replacement Rev 02 – Issue March 25/2020, inserted March 27/2020 pdf - 679 KB
Wednesday, March 25, 2020
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Technical Notes and Briefs: iSource+ Low Cost LPFRS Performance Performance data for Low Cost & Profile Frequency Rubidium Standard (LPFRS). pdf - 487 KB
Monday, March 10, 2003
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Technical Notes and Briefs: Vehicle Modeling with GPS Simulation Testing The typical application for a GPS simulator assumes an unobstructed view of the satellites. For advanced testing applications, it is possible to model the placement of the GPS antenna relative to the vehicle body. Starting in application software version 6.2 of the GSG series GPS simulators, vehicle modeling allows the simulated satellite signals to be blocked by the vehicle. Applications of this feature include aircraft maneuvers. pdf - 2 MB
Monday, December 31, 2018
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Technical Notes and Briefs: Check of hook and loop fasteners for mounting mechanisms: S1800000-25-00 Rev 01 – Issue Nov. 22/2013 pdf - 2 MB
Friday, November 22, 2013
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Technical Notes and Briefs: RoHS Compliance pdf - 148 KB
Wednesday, December 12, 2018
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Technical Notes and Briefs: GPS Receiver Mobile Mode Operation Starting with Tsync-PCIe firmware Release version 2.0.0, all TSync-PCIe timing boards that contain an internal GPS receiver have the capability of operating in either the factory default “Standard” mode (Also known as the “Stationary” mode) or can instead be programmed to operate in the available “Mobile” mode (also known as “Continuous” mode). pdf - 151 KB
Tuesday, November 15, 2011
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Technical Notes and Briefs: SB S1820511-25-01 Rev01 Mounting Bracket AS - Strap Replacement Rev 01 – Issue March 20/2020, inserted March 27/2020 pdf - 2 MB
Friday, March 20, 2020
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Technical Notes and Briefs: Epsilon Clock Issue: 2019 GPS Rollover Event In the process of testing the 2019 rollover event, the Orolia Engineering department has determined that this year’s event will potentially affect a limited volume of equipments embedding a Trimble Lassen IQ receiver, despite a Rollover week event compliant notice from the vendor. As a result, the time code may be affected but the GPS will remain locked. The following products have been identified: EC20S, EC22S. Support Bulletin
Wednesday, March 13, 2019
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Technical Notes and Briefs: Path Align-R Field Verification Check The following operational checks of the Path Align-R™ may be made by personnel in the field to confirm proper operation of both Path Align-R™ units, their coax cables and the waveguide adapters (transitions). This confirmation may be made prior to climbing the towers or whenever an operational confidence check needs to be made in the field, without access to test equipment or electronic technicians. pdf - 345 KB
Thursday, May 3, 2012
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Technical Notes and Briefs: LPFRS Phase Plot Phase Data for the Spectratime LPFRS Rubidium Source. pdf - 84 KB
Thursday, May 20, 2010
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Technical Notes and Briefs: Kannad ELT Product Safety Information Issue C. 08 Apr. 2020 pdf - 2 MB
Wednesday, April 8, 2020
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Technical Notes and Briefs: In-Field Coax Connector Test Using the Path Align-R A Path Align-R test set can be used in lieu of expensive cable sweeping equipment. Simply attach the Path Align-R to each end of the connectorized coax and measure the “Cable Loss” at the specific frequency the cable will see during operation. Also, if more than one coax is going to be attached to the tower, you can compare the “Cable Loss” of each coax before they are installed. pdf - 205 KB
Thursday, May 3, 2012
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Technical Notes and Briefs: LPFRS Warm-Up Plot pdf - 535 KB
Thursday, February 7, 2008
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Technical Notes and Briefs: Clock Accuracy in 911 Dispatch Centers Accurate time-of-day is important in Public Safety Communications Centers for time stamping of event records to provide legal evidence of emergency response times in court. Spectracom’s NetClock products automatically keep all the clocks in a center running exactly on time relative to the worldwide time standards. pdf - 123 KB
Thursday, July 26, 2012
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Technical Notes and Briefs: Space Cesium & Maser Clock Ensemble Space Passive Hydrogen Maser - Performance, Lifetime Data And GIOVE-B Related Telemetries. pdf - 285 KB
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Technical Notes and Briefs: Synchronizing Windows Computers The purpose of this document is to provide detailed information on synchronizing Windows 7, 2008, 2003 and 2000 Stand-Alone PCs and Domain Controllers, as well as Windows 7, 2008, 2003, VISTA, XP, 2000, NT, 98 and 95 clients with a Spectracom NTP time server. pdf - 2 MB
Tuesday, February 21, 2012
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Technical Notes and Briefs: Aligning Antenna Links Using Frequencies Outside of the Path Align-R Band Range An antenna system whose link frequency is designed outside the frequency band edge of the Path Align-R can still have its path alignment correctly adjusted, as long as the antenna system uses a waveguide which can operate at both the link frequency and a nearby frequency covered by the Path Align-R. pdf - 539 KB
Thursday, May 3, 2012
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Technical Notes and Briefs: The Onboard Galileo Rubidium and Passive Maser - Status & Performance Galileo program is approved by the European Commission and the European Space Agency (ESA). The activities related to GSTBV2 experimental satellite as well as the implementation of the In Orbit Validation phase are in progress. Atomic clocks represent critical equipment for the satellite navigation system and clocks development has been continuously supported by ESA. pdf - 571 KB
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Technical Notes and Briefs: Clock Accuracy in Computer Networks Network time synchronization relies on using a secure, accurate and reliable time source to improve network operations and management. pdf - 124 KB
Thursday, July 26, 2012
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Technical Notes and Briefs: Active Maser Clock for Space Clock Ensemble Development Of The Space Active Hydrogen Maser for the Aces Mission. pdf - 700 KB
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Technical Notes and Briefs: NTP Server Capacity Testing Large-scale NTP deployments require consideration for the network’s time synchronization architecture. Network time deployments are usually driven by considerations for reliability, scalability, manageability and security. The capability of modern NTP servers, such as Spectracom SecureSync® and NetClock® time servers, is such that capacity does not impact the design of the synchronization architecture.  pdf - 202 KB
Wednesday, February 13, 2019
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Technical Notes and Briefs: A Summary of References for the Design of Microwave Links Here is a summary of wireless supporting information useful in the design and management of microwave links. pdf - 225 KB
Sunday, May 3, 2015
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Technical Notes and Briefs: GPS Radiation Considerations When using a Spectracom GSG series GPS/GNSS signal generator with an optional antenna, one must consider regulations controlling the radiation of GPS-like signals into the air. This document describes the analysis for limiting these signals according to United States requirements. pdf - 205 KB
Thursday, May 3, 2012
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Technical Notes and Briefs: A Guide for Testers of GPS Devices and Systems What you want to know about GPS for testers of GPS devices and systems. pdf - 233 KB
Monday, December 31, 2018
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Technical Notes and Briefs: Swiss Space Atomic Clock Technologies and Applications in Space Science pdf - 753 KB
Saturday, February 1, 2014
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Technical Notes and Briefs: EpsilTime™ Synchronization Algorithm Spectracom time and frequency synchronization management algorithms, like EpsilTime™ used in models EC20S and EC22S, uses smart predictive technology to mitigate the effects of inherent GPS and oscillator noise, improves accuracy if GPS is lost(holdover), and corrects drift in the 10 MHz and 1PPS outputs simultaneously. That means there are always 10 million frequency cycles between every one pulse-per-second. pdf - 122 KB
Thursday, July 26, 2012
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Technical Notes and Briefs: 2018 KANNAD ELT MAINTENANCE POLICY pdf - 137 KB
Tuesday, January 23, 2018
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Technical Notes and Briefs: GPS Week Rollover Issues - Public Safety Products PDF - 124 KB
Monday, December 31, 2018
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Technical Notes and Briefs: Differences Between NTP and SNTP NTP (Network Time Protocol) and SNTP (Simple Network Time Protocol) are very similar TCP/IP protocols in that they use the same time packet from a Time Server message to compute accurate time. The procedure used by the Time Server to assemble and send out a time stamp is exactly the same whether NTP (i.e. full implementation NTP) is being used, or if SNTP is being used. pdf - 64 KB
Wednesday, February 13, 2019
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Technical Notes and Briefs: Time Server Port Isolation for Secure Networks When leveraging a single master clock / time server across several network segments there are various approaches to port isolation: software isolation, or hardware isolation via multiple processors, unidirectional communication of timing data, or electrical isolation by using fiber optics. pdf - 68 KB
Tuesday, December 23, 2014
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Technical Notes and Briefs: iSource+ RMO Mounting AppNote Rubidium Master Oscillator (RMO) Mounting Recommendations for Optimal Heat Sink pdf - 384 KB
Monday, December 10, 2018
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Technical Notes and Briefs: Environmental Modeling with GPS/GNSS Simulators The value of a GPS simulator is to generate RF signals corresponding to real-world scenarios for comprehensive testing from the bench. In addition to features such as multi-path and interference conditions, Orolia’s GSG series GPS/GNSS simulators can simulate signal obscuration via Environmental Models starting in application software version 6.1. pdf - 904 KB
Monday, December 31, 2018
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Technical Notes and Briefs: Outdoor GPS Antenna Installation Considerations Many Orolia timing and synchronization products utilize an embedded GNSS (Global Navigation Satellite Systems) receiver as a primary reference. Typical installations utilize an outdoor active GNSS antenna to collect and transmit GNSS satellite radio signals to the receiver via an RF cable. This technical note describes the main considerations for a successful outdoor GNSS antenna installation for a timing application: pdf - 325 KB
Friday, January 25, 2019
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Technical Notes and Briefs: Changes in the WWVB Radio Signal Affects Precision Frequency and Timing Reference

Spectracom had used the WWVB signal to synchronize its time and frequency references and master clocks in North America before the wide-spread use of GPS for precision timing applications. The last of these WWVB products has not been promoted for over 10 years and officially went end-of-life in 2005. A change in the WWVB signal was being considered in recent years to reduce impact of electro-magnetic interference and allowing for improved reception in consumer-grade clocks and watches1. However, this change affects the operation of precise time and frequency standards whose receivers are based on phase-locked loops, such as Spectracom WWVB receivers, so these products will no longer operate as intended.

References:
[1] J.P. Lowe, “We Help Move Time through the Air”, Radio World, March 23, 2011, Vol. 35, No. 8 pp. 69, 70.

pdf - 105 KB
Thursday, March 12, 2015
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Technical Notes and Briefs: Passive Maser Performance & Lifetime Space Passive Hydrogen Maser- Performance and lifetime data. pdf - 1021 KB
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Technical Notes and Briefs: Time Synchronization for Secure Networks using Fiber Government and military networks often utilize the concept of unclassified (black) networks vs classified (red) networks to manage levels of information security. Since a complete “air-gap” around a highly sensitive network is not practical, every data connection is evaluated as a security risk. To synchronize a master source of time on a red network, Spectracom offers a fiber optical IRIG time code link between a SecureSync master-slave pair to offer high accuracy timing to a classified network while satisfying the requirements of SIPRNET, NIPRNET and other ultra-secure network systems. pdf - 254 KB
Thursday, May 8, 2014
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