RefTek RT130 Timing Errors Affecting EPIC and FA Experiments
August 20, 2008
Updated: December 15, 2008. Program refj31fix released
Stations Affected: RT130 connected to a 130-GPS/01 with SiRF ublox Trimble module installed (aka SiRF-type)
Description of Problem: Starting on July 31st 2008 (julian day 213 2008) the SiRF-type started to shift in time by a second. Since the 31st July 2008 the mysterious time shifts (back and forth) continue. At present SiRF has no explanation for these time shifts.
Identifying SiRF GPS:
- Visually: The SiRF has no ring around the base of the connector attachment. If you see a white or orange ring the unit is NOT a SiRF.
- Log Messages: If your RT130 is using a SiRF GPS, the following message will be in your logfiles or the RefTek RT130 raw SOH file on the CF card:
EXTERNAL CLOCK TYPE: NMEA
(Garmin-type GPS clocks produce the string “EXTERNAL CLOCK TYPE: NMEA - Garmin”)
Solution: Refj31fix: A python program that will find and correct time tears is released. Please follow the download link below which will direct you to the program, installation and use instructions.
Download refj31fix (New!)
Experiments with SiRF-type GPS Clocks
logpeek Example Illustrating the Problem
Related categories:
- Home
- General Information
- Instrumentation
- Dataloggers
- Sensors
- All-In-One Systems
- Power Systems
- Field Procedures
- Controlled Sources
- Seismic Source Facility
- Magnetotelluric Systems at EPIC
- Ground Penetrating Radar
- Power and Memory Calculations Form
- Data Archiving
- Apply for a PI Account
- Experiment Scheduling
- Polar
- Hardware & Software Notes
- Software