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Timing is a very important aspect of the dual antenna lock and identical cable lengths will ensure that signal
Satellite Elevation Mask
This feature can be used to improve GPS signal quality when nearby obstacles like trees and building are reflecting or
temporarily obscuring the signal from satellites at low elevation. Raising the mask will cause the GPS engine to ignore
satellites below the mask angle, so must be used carefully as it also reduces the total number of received satellites.
The elevation mask angle can be changed in VBOX Tools Setup, VBOX Setup and by using VBOX Manager.
GPS Coldstart
A GPS coldstart may be required when:
• The GPS engine has locked up.
• VBOX is struggling to acquire satellite lock.
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.
After performing a GPS coldstart leave the VBOX 3i powered up in a static location where the antenna has an
unobstructed view of the sky until the
Both antenna cables must be the same length!
propagation delays do not cause unreliable dual lock.
'SATS' LED
becomes solid green.
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