EndRun Tempus LX GPS, User Manual

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T e m p u s L X G P S U s e r M a n u a l 6
C H A P T E R T W O
7 T e m p u s L X G P S U s e r M a n u a l
B A S I C I N S T A L L A T I O N
2. Then it will continuously light the green Sync Status LED.
3. When the unit locks onto a GPS signal and begins to decode the timing data and adjust the local
oscillator, the green Sync Status LED will flash very rapidly (about a 6 Hz rate) until the data is fully
decoded and the local oscillator is fully locked to the GPS frequency.
4. Then the green Sync Status LED will pulse at precisely a 1 Hz rate, synchronized to UTC seconds,
with a short on duration relative to the off duration.
At this point, the GPS time and frequency engine has fully synchronized, and you may proceed to
permanently mounting the chassis and antenna in their desired locations.
If this sequence has not occurred within twenty-four hours, and you have mounted your antenna in a
window or your rooftop installation has poor sky visibility, you may need to provide an accurate ref-
erence position to the unit so that it can operate with only one satellite in view. If you have mounted
the antenna in a window and can easily move it to the rooftop, you should do that first. Should you
need to provide a reference position to the unit, refer to Appendix D - GPS Reference Position and
the
setgpsrefpos
command for details.
If you are unable to achieve GPS lock after trying all of these suggestions, then your Tempus LX may
be damaged and should be returned to the factory for repair or exchange.
Installing the Tempus LX
FCC NOTICE
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruc-
tion manual, may cause harmful interference to radio communications. Operation of this equipment in a
residential area is likely to cause harmul interference in which case the user will be required to correct the
interference at his own expense.
Mount the Tempus LX
Using standard 19” rack mounting hardware, mount the unit in the desired location. After mounting
the unit and connecting the antenna cable, verify that it still acquires and tracks a GPS signal.
CAUTION
Ground the unit properly with the supplied power cord.
Position the power cord so that you can easily disconnect it from the Tempus LX.
Do not install the Tempus LX where the operating ambient temperature might exceed 122°F (50°C).
Connecting the DC Power Option
Connect the safety ground terminal to earth ground. Connect the “+” terminal to the positive output