User's Manual

SPSx80 and SPSx81 Smart GPS Antennas User Guide 45
Setting up the Receiver 5
receiver front panel. 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). 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 Smart GPS antenna, use the 25 cm spacer rod provided
with the 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 (Modular GPS receiver only).
3. Connect the GPS antenna to the receiver using the appropriate cable (Modular
GPS receiver 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.