Trimble Inc. 5935524-B1 Benutzerhandbuch

SPSx80 and SPSx81 Smart GPS Antennas User Guide     

Setting up the Receiver     

 

Figure 5.1

SPSx50 receiver permanent installation

For construction applications where a daily setup and takedown of equipment is 
required for security reasons, Trimble recommends that you use a T-Bar setup. 

The T-Bar consists of a post mounted in concrete (so it cannot move), which has a 
solid metal T-Bar mounted to it to provide lateral and vertical separation between the 
GPS antenna and radio antenna. The T piece of the T-Bar has a vertical rod at each 
end. Each end terminates in a 5/8"

×11 thread to which the antennas can be mounted. 

Trimble recommends that one end is clearly marked GPS and the other end is clearly 
marked Radio so that at each daily setup, the GPS and radio antennas are mounted at 
the same location. Switching antennas by mistake introduces a position error in all 
resulting measurements. You can buy the parts you need to make a T-Bar from any 
reputable hardware store. Make certain that the T-Bar cannot rotate after 
construction. Rotation of the T-Bar can introduce a position error into all subsequent 
measurements.

On the upright post, mount either a bracket (to which the GPS receiver can be 
mounted), or a well-ventilated lockbox (in which the GPS receiver itself can be 
secured).