Gps-Related Accessories; Lightning Arrestor; Antenna Splitter; In-Line Antenna Amplifier - Symmetricom XLi User Manual

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Other factors, such as radiation, coverage, VSWR, and input impedance also affect system
performance. Symmetricom recommends using the standard antenna and cable provided.
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Figure 4: GPS Signal Strength Requirements

GPS-related Accessories

The following options can be obtained from Symmetricom to:
• Protect against lightning and field-induced electrical surges.
• Connect multiple GPS receivers to a single antenna.
• Extend the range of the GPS antenna cable.

Lightning Arrestor

Lightning may damage GPS system components and receiving equipment, even without a direct hit,
resulting in costly repairs and critical interruption of service. The lightning arrestor is designed to work in
conjunction with a low-resistance, low-inductance ground to protect your GPS receiver and elements of
the antenna system from lightning discharges and field-induced electrical surges. In-line lightning
arrestors are mounted between the antenna and the point where the cable enters the building and
require no additional power or wiring except the ground lead.

Antenna Splitter

An antenna splitter may be used to drive multiple GPS receivers using a single antenna. With built-in
amplification to overcome splitter losses, the Active Splitters may be conveniently cascaded without
adding separate amplifiers and bias-tees between splitters. Power is conveniently obtained from the
GPS receiver(s) connected to the amplifier, eliminating the need for a separate dc power supply and
wiring.

In-Line Antenna Amplifier

In-line amplifiers overcome signal attenuation in by amplifying the GPS signal. Mounting the amplifier
inside the mounting mast helps protect it from moisture and exposure to the elements. Use the in-line
amplifier for cable runs of 150 to 300 feet (45 m to 90 m). Please contact a Symmetricom Sales
Representative for information on how to extend the distance from the antenna to the receiver.
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XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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