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Symmetricom XLi User Manual

Symmetricom XLi
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XLi Time & Frequency System 19
XLi-man, Issue 8, 6/17/2008, Rev. H
2
5
1
SSSSSSSSSSSS SSSSSSSSSS SSSSSSS S SSS S SSSSS S
3: Installation/Configuration
Installing the GPS Antenna
For units that include the GPS option, install the GPS antenna and cable as described below.
Selecting a GPS Antenna Site Outdoors
Select a site that...
Is the highest point available
Offers a full 360° view horizontally, to within 10° vertically of the horizon
Is higher than neighboring buildings/obstructions
Is protected from strong radio frequency (RF) and microwave transmissions
Is set away from RF-reflective surfaces that cause multipath interference
Is set 3 ft. (1 m) away from other GPS antennas
Avoid...
Mounting the antenna between tall buildings or next to walls and equipment
Cable runs from the antenna to the receiver that exceed the specified length
Patching multiple cables together to make a single cable run
Running the cable through bulkheads and along side high-energy cables
Crimping or damaging the cable
Blocked signals and multipath cancellation significantly increase GPS acquisition time. Multipath
cancellation is caused by reflected signals that reach the antenna out of phase with the direct signal due
to vertical reflective objects positioned to the side and above the antenna. To solve these problems, mast
mount the antenna at least 1 meter away from and above the reflecting surface.
Mounting the GPS Antenna
Mount the GPS antenna on an antenna mast (recommended) or on the peak of a building. The GPS
antenna kit includes special mounting brackets. For the mast, use 2-inch (5.08-cm) diameter water pipe
or conduit that is rigid enough to withstand high winds without flexing. Use guy wires to stabilize masts
longer than 10 ft. (3.048 m).
Notes:
The XLi requires a 12 Volt-compatible antenna. Antennas not rated for 12 V will be damaged.
Use a splitter to connect a GPS antenna to multiple receivers. Avoid using BNC “T” connectors.
The L1 GPS antenna is designed to operate with up to 150 ft. (60.96 m) of RG-59 coax cable. An
optional Down Converter can be used for cable runs of 1,500 ft. (457.2 m) using RG-58 coaxial
cable.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

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Symmetricom XLi Specifications

General IconGeneral
BrandSymmetricom
ModelXLi
CategoryMeasuring Instruments
LanguageEnglish

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