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VBOX 3i User Guide
GPS Antenna
The GPS antenna supplied with the VBOX 3i is a 5V active antenna. For the best possible signal quality, it is important to maintain a clean connection between the
antenna and the VBOX 3i. Before fixing the antenna to the VBOX 3i, ensure that there are no dust particles in either connector. Replacement antennae are available
by contacting your VBOX 3i distributor.
The antenna is a magnetic mounting type for quick and simple mounting to the vehicle roof. For optimum GPS signal reception, make sure that the antenna is fitted
to the highest point of the vehicle away from any obstructions that may block satellite reception. The GPS antenna works best with a metal ground plane underneath
(a metallic vehicle roof is perfect for this).
Please also note that when using any GPS equipment, a clear sky view is important. Objects in the surrounding area such as tall buildings or trees can block the
GPS signal causing a reduction in the number of satellites being tracked, or introducing reflected signals that can decrease the accuracy of the system. Note that
clouds and other atmospheric conditions do not affect the VBOX 3i‟s performance.
GPS antennas require a ground plane to operate correctly. This helps to reduce unwanted reflections of the
GPS signal caused by nearby objects, and usually the metal roof of a vehicle performs this function. However, if
a test requires an antenna to be placed either off the vehicle, or on a vehicle that does not have a metallic roof,
a special ground plane antenna must be used. This has an internal ground plane and can operate perfectly
without the need for mounting on a metal surface. Ground plane antennas are available from your VBOX 3I
distributor.
Page 15 of 46
28/08/2013
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