Trimble Outdoors SPSX51 - Manual (Page 49)

SPSx51 Modular GPS Receivers User Guide 47
Setting up the Receiver 5
1. Mount the GPS antenna on the tribrach adaptor.
2. Clip the GPS receiver to the tripod.
3. Connect the GPS antenna to the receiver using the appropriate cable.
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
Fixed height tripod setup
A fixed height tripod setup is similar to a tripod setup, but is simplified by the central
leg of the tripod, that is placed directly on the control point. If the central leg is leveled
accurately, the fixed height tripod is quick and easy to set up, and provides an accurate
way to measure the true antenna height.
1. Set up the tripod over the control point.
2. Attach the GPS antenna to the head of the tripod.
3. If using an external high-gain radio antenna, mount the radio antenna to the
radio antenna bracket that is attached to the head of the tripod (beneath the
GPS antenna). See
Figure 5.4 .
4. Hook the receiver to the center leg of the tripod, using the tripod clip.
SPSx81 with an internal 450 MHz
Tx radio SPSx51 with an external
high-gain antenna SPSx51 with a low-gain “rubber
duck” antenna