222 XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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1
Legacy Option Cards
GPS Receiver (86-8013)
Introduction
The optional GPS Receiver card acts as a Stratum 0 timing reference source to the XLi. It tracks up to 12
L1 GPS satellites, decodes their signals for time and position, and feeds this data to the XLi through the
internal backplane. When available and enabled, the GPS Receiver card provides superior time and
frequency accuracy on the XLi (See “System Time & Frequency Accuracy” on page 6
). The GPS
receiver card comes with an L1 GPS antenna, cabling, and mounting hardware unless otherwise
specified at the time of purchase.
See “Installing the GPS Antenna” on page 19
for information on selecting an antenna site, mounting the
antenna, and signal strength requirements.
The GPS receiver card can be managed and configured using F119, available from the keypad and
command line. See “F119 – GPS Receiver Configuration” on page 154.
Specifications
Related topics:
•
“Installing the GPS Antenna” on page 19
• “XLi with a GPS Reference” on page 30
• “XLi with two optional GPS receivers” on page 30
• “F50 – GPS Receiver LLA/XYZ Position” on page 75
• “F51 – GPS Antenna Cable Delay” on page 77
• “F60 – GPS Receiver Satellite List” on page 81
• “F69 – Time Mode” on page 89
• “F73 – Alarm Control / Status” on page 94
• “F74 – Clock Source Control” on page 107
• “F119 – GPS Receiver Configuration” on page 154
Frequency 1575.42 MHz (L1 signal)
Code Coarse Acquisition (C/A) code
Tracking Up to 12 satellites
Position Accuracy Typically < 10m when tracking four (4) satellites
XLi 1 PPS Accuracy 30 nS RMS UTC (USNO), 100 nS Peak (99%)
Time standard: UTC
Antenna input Female BNC
Antenna Power 20 mA – 220 mA, +12 V
CPU-Aware: Yes
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