Symmetricom TimeProvider 2700 User Manual

098-00564-000 Revision A3 – July, 2013 TimeProvider 2300/2700 User’s Guide 327
Appendix C Installing GNSS Antennas
GNSS Antenna Installation
Caution: To avoid damage to the GNSS antenna, do not place the
antenna where high-power radio signals are beamed directly at the
unit. Such signals can damage the preamplifier of the GNSS antenna.
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 GNSS antenna near,
under, or around high voltage lines.
 Follow local building electrical codes for grounding using the
frame ground lugs on the shelf.
 The in-line amplifier receives 5 VDC power from the GNSS
receiver, and is supplied on the center conductor of the LMR-400
or equivalent coaxial cable.
 Symmetricom does not recommend cutting the antenna cables
provided in the GNSS Antenna Kit.
Recommendation: Symmetricom recommends that you consider the
following location and environment influences before installing the
GNSS 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, 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 GNSS antenna at least 3.7 m (12 ft.) from metallic
objects, if possible.
 Locate the antenna high enough to avoid drifted snow.
 Locate the lightning arrestor in a protected area to avoid contact
with standing water.
 Locate the antenna within 9.1 m (30 ft.) of the point at which the
antenna cable enters the building.
 Allow at least 3.0 m (10 ft.) of separation distance between GNSS
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 GNSS receiver.

Symmetricom TimeProvider 2700 Specifications

General

Brand	Symmetricom
Model	TimeProvider 2700
Category	Network Hardware
Language	English