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02 - VB3i GPS Antenna Placement
https://racelogic.support/01VBOX_Automotive/01VBOX_data_loggers/VBOX_3i_Range/
Single Antenna Systems
The GPS antenna supplied with the VBOX is a 5 V active antenna. For the best possible signal quality, it is important to
maintain a clean connection between the antenna and the VBOX. Before fixing the antenna to the VBOX, ensure that
there are no dust particles in either connector. Replacement antennae are available by contacting your VBOX
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's performance.
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Summary of Contents for Racelogic VBOX 3i
- Page 1 02 - VB3i GPS Antenna Placement https://racelogic.support/01VBOX_Automotive/01VBOX_data_loggers/VBOX_3i_Range/ Single Antenna Systems The GPS antenna supplied with the VBOX is a 5 V active antenna. For the best possible signal quality, it is important to maintain a clean connection between the antenna and the VBOX. Before fixing the antenna to the VBOX, ensure that there are no dust particles in either connector.
- Page 2 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.
- Page 3 Dual Antenna Systems For further info on slip/pitch and slip/roll setups, click here. When testing using dual antenna mode, the greater the antenna separation, the greater the accuracy of the dual antenna derived data channels. Slip Angle Accuracy Pitch/Roll Angle Accuracy <0.2°...
- Page 4 Some vehicle roofs limit the potential separation value. In this case a roof mount (RLACS171) can be utilised to increase separation. Antennas should be positioned so that the gold antenna connector of primary and secondary antennas (A+B) are pointing in the same direction. This matching positioning ensures that the separation measurement is relative. We recommend you measure separation from outer edge of antenna connector A, to same outer edge of antenna connector B.
- Page 5 the 2D distance between the antennas as viewed from above. It is not the straight-line distance between the antennas, regardless of the mounting angle.
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Page 6: Gps Coldstart
A GPS coldstart forces the GPS engine to reset its downloaded almanac of current satellite positions. This can be useful if the VBOX 3i is having trouble locking onto satellites, which typically occurs if the VBOX 3i has not been used for several weeks or if it was last used a long distance (over one thousand miles) away from the current location. - Page 7 To perform a GPS coldstart on the VBOX3i perform the following actions: 1. Press and hold the ‘LOG’ button on the front of the VBOX 3i for five seconds until a long beep is sounded. 2. When the button is released the ‘SATS’ LED...
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