User's Manual

5 Setting up the Receiver
42 SPSx80 Smart GPS Antenna User Guide
Each day, mount the GPS antenna on the GPS end of the T-Bar and the radio antenna
on the Radio end of the T-Bar. Connect the antennas to the receiver using the
appropriate cables.The receiver uses its own integrated battery, or an external 12 V
battery through the 12 V crocodile clips cable that are provided with the receiver. If you
choose to use AC power, remember that the heat generated by the charging process
and the radio transmitter increases the need for good ventilation around the receiver.
In such scenarios, an SPSx80 Smart GPS antenna is also often used. Simply mount the
SPSx80 on the T-Bar, and optionally connect to an external battery or radio unit.
Advantages
Use of a T-Bar setup ensures that the base station is set up with exactly the same
position and height every day. This helps eliminate the errors typically associated with
daily tripod setup. For example, wrong antenna height, base not set up over the point,
base set up in the wrong location.
Figure 5.2 System set up on a T-bar showing an external radio antenna to gain longer
range
Setting up a mobile base station: Tripod and fixed height tripod
If you are repeatedly moving between jobsites, or if 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 set up over a control point. 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
GPS
Radio