User's Manual

SPSx80 Smart GPS Antenna User Guide 43
Setting up the Receiver 5
height) to the right location on the antenna (base of antenna or to a specified location
on the antenna). When you start the rover receiver, it is extremely important to check
in, at one or more known locations, to check for possible position or height errors.
Checking in at a known location is good practice and can avoid costly errors caused by
a bad setup.
Typically, the tripod and fixed height tripod methods do not give significant height
clearance above the ground, and can reduce the range of operation caused by radio
limitations.
Tripod and tribrach setup
In the tripod setup, the tripod is located over the control point, and the tribrach and
tribrach adaptor is mounted on the tripod and centered over the point.
1. Mount the GPS antenna on the tribrach adaptor.
– If you are using a SPSx80 Smart GPS antenna, use the 25 cm spacer rod
provided with the SPSx80 base station accessory kit. This allows the radio
antenna in the receiver to clear the head of the tripod.
2. Clip the GPS receiver to the tripod (SPSx50 and SPS770 only).
3. Connect the GPS antenna to the receiver using the appropriate cable (SPSx50
and SPS770 only).
4. If necessary, connect the GPS receiver to an external 12 V power supply. Use the
crocodile clip cable or the Trimble custom power pack.
Figure 5.3 Tripod and tribrach setup for the SPSx50 and the SPSx80
SPSx80 with an internal 450 MHz
TX radio
SPSx50 with an external
high-gain antenna
SPSx50 with a low-gain “rubber
duck” antenna