The GPS antennas supplied with the VBOX IISL are 3.5 V active antennas. For the best possible signal quality, it is important to maintain a clean connection between the antennas and the VBOX. Before you fix the antennas to the VBOX, make sure that there are no dust particles in either connector. Replacement antennas are available by contacting your VBOX distributor.
The antennas are the magnetic mounting type for quick and simple mounting to the vehicle roof. For optimum GPS signal reception, make sure that the antennas are fitted to the highest point of the vehicle and away from any obstructions that may block satellite reception. The GPS antennas works best with a metal ground plane underneath (eg. Vehicle roof).
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.
Single Antenna Placement
GPS antennas require a ground plane to operate correctly. Usually, the metal roof of a vehicle performs this function. However, if a test requires an antenna to be placed off of the vehicle, you need to use a special ‘mushroom-style’ antenna. These antennas are capable of operating without an additional ground plane as they have an internal one. The Ground Plane Mushroom-style Antennas (RLVBACS065) are available from your VBOX distributor.
RLVBACS065 Mushroom-style Ground Plane Antenna