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GPS500 User Manual – Rev E – 2020.04.14
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9
Antenna Cable Configurations/Options
Antenna cabling solutions typically vary depending on how far
the antenna is installed from the GPS receiver. 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). Beyond 300 feet (90 m) alternative
methods may be used. Figure 3 highlights the cable lengths and
the antenna solutions that enable them.
In-line Amplifier
In-line amplifiers overcome signal attenuation in by amplifying
the GPS signal, adding an additional 150 feet (45 m) in cable
length. The inline amplifier attaches directly in line with the
antenna cable and uses the same power as the antenna; no
extra wiring is required.
GPS Down/Up converter
The GPS Down/Up converter makes cable runs of 250 to 1500
feet (75 m to 457 m) possible. GPS signal down conversion
requires a special GPS antenna and corresponding signal up-
converter. The antenna module converts the signal down to
a lower frequency that is less susceptible to attenuation, and
transmits it the length of the cable to the up-converter. The up
converter restores the signal to the normal GPS signal
frequency for the receiver. The down/up conversion process
is transparent to the GPS receiver. As with any precision GPS
timing receiver, only cable delay and down conversion delays
need to be entered into the receiver. Power is supplied
by the GPS receiver. In the case of Bus level GPS receivers an
external power supply is used. It is important to note that the
cable used in GPS down/up conversion is different than the
standard cable.
Fiber Optic Links
Fiber-optic connections function as a transparent link between
the antenna and GPS receiver equipment. These links eliminate
the limitations of copper systems by enabling longer
transmission distances while retaining the highest level of
signal quality. In addition, fiber optics provide several other
significant network advantages, including simplified network
design, ease of installation, and immunity from EMI/RFI and
lightning.
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