Upgrade Your Praecis Gfr

Free Software Upgrades

We provide software upgrades for all our products at no charge.  The software available on this page is for the Praecis Gfr only.  To download software for the Praecis Cfr (Time & Frequency Standard with CDMA) click here. The latest binary file is below:


GPS Receiver Subsystem firmware - v2.22 (<250K)


Upgrade Instructions

The binary image file above is zipped so please unzip before proceeding.  Then you are ready to perform the upgrade to your Præcis unit.  Please refer to your User Manual, Appendix B - Upgrading the Firmware, for further instructions.  If you would like to download the manual click here.

Note:  Downloading a new binary image may cause your stored user settings to be reset to their factory defaults.  We recommend you make a note of your current user settings before downloading.  (Use the SETTINGS command for a report of all settings.)

If you have any problems with the upgrade please contact customer support by email or phone: 1-877-749-3878.


History of Software Changes

(Part Number 6010-0001-005)

Version Changes
2.22 Changes include:
1.  Corrected week rollover problem caused by GPS receiver from 3rd-party vendor.  Symptoms began at UTC midnight on Feb 14, 2016.  This product should not be affected by another GPS week rollover until the year 2035.  For details, read this Field Service Bulletin.
2.  Added error checking on UTC offset parameters received from GPS receiver.
2.21 Changes are pertinent to CDMA units and are not listed here.
2.20 Changes are pertinent to CDMA units and are not listed here.
2.19 Corrected a rare problem where GPS position fixes would be unavailable for processing and the unit would eventually lose lock.
2.18 Fixed a potential bug that occurred only in situations where the GPS antenna is connected via a splitter or distribution amplifer.
2.17 Changes are pertinent to CDMA units and are not listed here.
2.16 Added new time code output format.
2.15 Changes are pertinent to CDMA units and are not listed here.
2.14 Improved integrity checking on time information input.
2.13 Corrected bug in holdover-capability for units with oscillator options.
2.12 Fixed bug wherein unit with window-mount antenna would lose tracking on satellites but still report satellites in view.
2.11 Changes include:
1.  Added a dynamic-mode capability for mobile applications.
2.  Added a five-minute warmup period for units with rubidium oscillators.
2.10 Added the ability to set the TFOM level at which a system fault will occur.
2.09 Added optional time code output capability.
2.08 Changes are pertinent to the CDMA products and are not listed here.