User's Manual

5 Setting up the Receiver
50 SPSx50 Modular GPS Receiver User Guide
Setting up a Mobile Base Station: Tripod and Fixed Height Tripod
For construction applications where you are repeatedly moving between jobsites, or
you are visiting a jobsite for the first time before a T-bar or similar setup can be
established, Trimble recommends that you use either a tripod and tribrach setup or a
fixed height tripod.
The fixed height tripod is quicker and easier to setup over a control point. In these
situations, you need to take great care to ensure that the GPS antenna is set up
accurately over the control point, and that the GPS antenna height is measured
accurately, in the right way (vertical or slope height) to the right location on the
antenna (base of antenna or to a specified location on the antenna). It is also more
important for operators using these types of setup to check in, at one or more known
locations, on starting the rover receiver to check for possible position or height errors
before starting work. Checking in at a known location is good practice and can avoid
costly errors caused by a bad setup.
The tripod and fixed height tripod method, typically does not give a significant height
clearance above the ground, and can result in reduced range of operation caused by
radio limitations.