If you are struggling to maintain a stable satellite lock, you can connect the supplied external antenna (RLACS262) to the antenna socket. You should also use the external antenna when you are doing Brake Trigger Tests. You can find more information about the external antenna further down on the page.
The port can also be used to connect a Hand Held Start/Stop Logging Switch (RLVBACS010) to control the logging of the unit. More information on this is available here.
|You can find more detailed connector information on the PIN OUTS page.|
Connection to an NTRIP Modem
Connect the RLCAB170 cable from the bottom Hirose connector on the NTRIP Modem to the bottom CAN/Serial port of the VBOX Touch. Ensure that the NTRIP Modem is correctly configured for use before connecting to the unit.
Connection to a Local DGNSS Base Station
VBOX Touch RTK receives RTCM correction data from a telemetry radio module which acts as receiver for information transmitted by the Racelogic DGNSS Base Station. It is connected to the bottom CAN/Serial port of the VBOX Touch via an RLCAB005.
Racelogic also provide solutions to use SATEL radio modems for long range applications on large test sites. The connection to the VBOX will be the same in this instance, however instead of an RLCAB005, an RLCAB096L would be used which has a 15 way D-Sub connector for connection to the SATEL radio modem.
Ensure that the Base Station is correctly configured for use before connecting to the unit.
VBOX Touch is supplied with a Swivel Neck Richter Suction Mount (RLACS277) for mounting onto a vehicle windscreen. It can also be secured using the ¼ 20 TPI UNC screw thread on the back of the unit.
VBOX Touch has an internal patch antenna, meaning that in many circumstances, where the unit has a clear view of the sky without any interference, an additional antenna is not required. However, if you are struggling to maintain a stable satellite lock (indicated by a flashing red satellite icon), an external antenna (RLACS262) is also supplied with the unit which can be used.
- If you are conducting Brake Trigger Deceleration Tests, the external antenna should be used.
- If you are intending on receiving RTK corrections with a VBOX Touch RTK unit, the external antenna should be used.
- The first time that the unit is used, it may take up to 10–15 minutes to fully acquire satellites. After this, it will usually take 1–2 minutes to acquire satellites.
External Antenna (If Required)
The placement of the GNSS antenna is crucial to the quality of the data recorded by VBOX Touch. Any metal close to a GNSS antenna can unpredictably disturb the signal due to interference from reflections of weak GNSS signals.
For the best results, use the antenna in the centre of a metal roof at least 5 cm away from any roof bars or radio antennas. Do not mount the antenna close to the edge of the roof as reflections from the ground may interfere with the signals. Avoid the edges as reflections from the A-pillars will cause problems.
Mount the antenna as high up as possible and keep it above any roll bars. Pieces of metal close to and above an antenna will badly disrupt the GNSS signal.
If the vehicle being used does not have a metal roof, then place the GNSS antenna on a flat piece of metal at least 10 cm in diameter. If this is not possible, copper or aluminium foil can be used to create a shaped ground plane underneath the antenna. For example, on a fibreglass roof, mount the antenna on top of the roof, and place some adhesive-backed metal foil underneath, on the inside of the roof.
Acquiring Satellite Lock
Tall buildings or trees can block GNSS signals, causing a reduction in the number and quality of satellites being tracked, leading to inaccurate position measurements and a noisy velocity signal.
GNSS works best in open areas/ Avoid tree-lined roads
If VBOX Touch is struggling to acquire a satellite lock, a GPS coldstart may be required. This may be necessary when the unit hasn’t been used for several days or has dramatically moved location since its last use.
To perform a coldstart, press the COLDSTART button within the Diagnostics Settings menu.
When the button has been pressed, the unit will make an audible sound and a ‘PLEASE WAIT’ message will be displayed on the screen which will count down from 3. The number of satellites will then be displayed as '00' and GPS status will show ‘SEARCHING FOR SATELLITES’ until the satellite lock has been acquired. It will take approximately 25 – 30 seconds for the unit to reacquire the satellite lock.