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When measuring Slip angle at a specific point on a vehicle (for example over a given wheel), the primary Antenna A
must be placed over this point on the vehicle.
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, then a special Ground Plane 'mushroom-style'
antenna must replace the off-vehicle antenna, as these antennas are capable of operating without a ground plane.
If a vehicle roof also has obstacles such as roof bars then Ground plane antennas should be used as they can be
mounted higher than the obstacle.
The Ground Plane 'mushroom' style antennas RLVBACS065 are available from your VBOX distributor.
If only one antenna will be placed 'off-vehicle' then only one Ground Plane antenna need be purchased.
https://en.racelogic.support//Product_Info/VBOX_Data_Loggers/VBOX_II_Range/VBOX_II_User_Guide/07_-
_VBOX_20SL3_Triple_Antenna_Placement
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