Antennas
Installing Antennas
402 SSU-2000 User’s Guide 12713020-002-2 Revision D – April 2004
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,
under, or around high voltage lines.
Follow local building electrical codes for grounding using the
frame ground lugs on the SSU-2000 chassis.
The in-line amplifier receives 5 vDC power from the GPS radio
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
provided in the GPS Antenna Kit.
Recommendation: Consider the following location and environment
influences before installing the GPS antenna:
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.
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.
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