Accessories
Antenna cabling solutions typically vary depending on how far the antenna is installed from the GPS receiver. Antenna cable runs are supported from the standard 50 ft (15m) to over 1500 ft. (45 m). 150 feet (45 m) is the unaided cable length limit for many GPS timing receivers.
Adding a GPS inline amplifier extends the cable length an additional 150 feet (45 m) up to a total of up to 300 ft. (90 m). The inline amplifier installs in-line with the antenna cable, using the existing antenna power. No extra wiring is required.
The GPS Down/Up converter makes cable runs of 250 to 1500 feet (75 m to 457 m) possible using a special GPS antenna that converts the signal to a lower frequency less susceptible to attenuation, and transmitting it the length of the cable, powered by the GPS receiver. An external power supply is used for Bus Level GPS receivers.
General Antenna Information
Every GPS receiver requires an antenna to operate. There are several basic antenna types used with GPS timing receivers, including an optional window mounted antenna for NTS time server products. The roof mounted antenna is required for the more accurate GPS clocks. For more information, please click on the below links:
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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.
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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.
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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).
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L1 Antenna GPS Up/Down Converter
Use the GPS Down/Up converter for cable runs of 250 to 1500 feet (75 m to 457 m). GPS signal down/up conversion is required when signal losses in the antenna cable limit the distance between the receiver and the antenna assembly. The Down/Up Converter may also work with non-Symmetricom L1 GPS receivers. The signal output from the converter is L1 C/A code that can be decoded by any L1 GPS receiver.
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Test Reports
Symmetricom has tested several antenna configurations.
To access and download copies of our reports, click here.
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