Symmetricom TimeProvider 5000 User Manual page 474

Appendix C Installing the GPS Antenna
Antenna Installation
Recommendation: Symmetricom recommends that you consider the
following location and environment influences before installing the
GPS antenna:
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474 TimeProvider 5000 User's Guide
Warning: To avoid serious injury to personnel or damage to
equipment, exercise caution when working near high voltage lines.
In particular:
Use extreme caution when installing the GPS antenna near,
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under, or around high voltage lines.
Follow local building electrical codes for grounding using the
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frame ground lug on the TimeProvider 5000 chassis.
The in-line amplifier receives 5 VDC power from the GPS radio
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receiver, and is supplied on the center conductor of the LMR-400
or equivalent coaxial cable. If the application requires an in-line
amplifier, mount the amplifier/plate assembly where the transient
eliminator would normally be mounted.
Symmetricom does not recommend cutting the antenna cables
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provided in the GPS Antenna Kit.
If possible, provide the antenna with an unobstructed 360-degree
view of the sky from the horizon.
In general, do not allow obstructions that obscure the horizon (as
viewed from the antenna) by more than 10 degrees, as shown in
Figure C-1.
Locate the antenna well away from, and preferably in a plane
above electrical equipment such as elevators, air conditioners, or
other machinery.
To reduce the risk of lightning damage, do not place the antenna at
the highest point of the building.
Locate the GPS antenna at least 12 feet from metallic objects, if
possible.
Locate the antenna high enough to avoid drifted snow.
Locate the transient eliminator in a protected area to avoid contact
with standing water.
Locate the antenna within 30 feet of the point at which the antenna
cable enters the building.
Allow at least 10 feet of separation distance between GPS
antennas.
Surfaces above the plane of the unit that are between the antenna
and the horizon can produce reflected (multi-path) signals, which
can degrade the performance of the radio receiver.
098-00028-000 Revision F – May, 2012