Tasks
n Radio towers may require the services of a specialist, and may be subject to signal inter-
ference.
n Must be able to withstand very high winds.
If a good site is not available, consult Operating in "Window Mode" (on page 102).
Installing the GPS Antenna
1. Observe all relevant safety precautions and building code regulations. Avoid:
n Electrocution, RF, lightning, and falling hazards.
n RFI and EMI sources such as transmitting antennas.
n Crimping or making sharp bends in the cable.
2. Mount the standard L1 GPS antenna at the selected site:
n Position the GPS antenna vertically, with its top pointing toward the sky, and the
PVC mounting mast and connector pointing down.
n Secure the PVC mounting mast to the structure using the pipe clamps provided
with the antenna kit.
3. Run the antenna cable or cables to the SyncServer. Use a lightning arrestor and ground-
ing, as required to meet building and safety codes.
4.
Connect the antenna cable to the GPS Ant connector on the rear panel.
Note: Microsemi recommends posting a "Do not paint" notice to prevent the GPS antenna
from being painted accidentally.
Tips:
n The user can access the connector underneath the GPS antenna by removing the four
recessed screws in the lower half of the GPS antenna with a Phillips-head screwdriver. It
is a relatively easy task and does not violate the weatherproofing design of the antenna.
Typically, users do this to attach an optional in-line amplifier inside the PVC mounting
mast or to replace the standard cable with a longer one. (Avoid unscrewing the PVC
mounting mast from the base of the GPS antenna as this may require a vice and lots of
torque.)
n When extending the length of the cable, observe the recommended configurations in
GPS Cable Configurations/Options (see "Distance Between Antenna and Receiver"
on page 105). Avoid exceeding the recommended lengths by combining the standard 50
foot (15.24 m) cable with the extended-length cable.
Operating in "Window Mode"
The SyncServer Network Time Servers can provide can provide excellent synchronization to
UTC if the GPS receiver has an accurate fix on its position and one current GPS satellite
most of the time. This capability is known as Window Mode.
When a good antenna site isn't available, the user may be able to use sites with limited vis-
ibility of GPS satellites and reduced signal strength, such as:
n Indoors, in a window or skylight.
n Outdoors, on a balcony railing, building corner, or surrounded by tall structures (limited
view)
Page 102..........................................................................997-01520-02 Rev. G2
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