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Chapter 5 Antennas
Installing Antennas
254
SSU-2000e Technical Reference
12713140-003-2 Revision E.01 – January 2007
In general, follow local building codes when selecting a grounding scheme, wire
size, and installation.
Use #6 AWG (13.3 mm) copper ground wire or larger, depending on the distance
to the earth ground electrode. Refer to your local electrical codes for specific
details. In most cases, 1/0 AWG (55.0 mm) ground wire will maintain 1/10 the
resistance of the coaxial shied..
Connect transient eliminators, if part of the grounding scheme, to earth ground
through a conductor.
Symmetricom makes no recommendation as to whether to install transient
eliminators. Symmetricom can provide suitable transient eliminators as an option.
Never connect antenna systems to the same earth ground connector as heating
and cooling systems, elevator or pump motors, or other motors or machinery
which can induce noise in the antenna system.
Antenna Installation Tools and Materials
These standard tools and materials are not supplied in the antenna kit, but may be
required for installing the GPS antenna. For a list of antenna kit contents, see
Four each 0.25 in (6 mm) fasteners for installing the antenna floor flange
Extra cable ties or acceptable cable clamps
#6 AWG (minimum) copper ground wire
Eight-foot (2.9 m) ground electrode
Custom mounting plates, U-bolts, masonry bolt, and so forth, as needed for
mounting to a tower, roof, or wall of a building
A cable puller may be required for installing the antenna coaxial cable
Digital voltmeter (DVM)
Note:
Larger ground conductors provide better transient elimination;
that is, the larger the ground conductor, the less likely the chance of
transients.
Note:
Do not
connect the outside transient eliminator ground to the
inside equipment rack ground. Doing so can defeat the protection
afforded by the transient eliminator.
Caution:
To prevent damage to connectors, use caution while
pulling cable.