4 Setting Up
4.1 Setting Up Base Station
4.1.1 Choose a suitable place
A suitable place is essential for base station to better receive the satellites and transmit
the UHF signals. A suitable position should comply with following conditions:
(1) Choose a wide-open area in order to easy and better receive signal of satellites.
Besides, make sure there is no covering like roof or heavy foliage.
(2) A higher place is better for transmitting the UHF signals. If rover is far away from
base, then the enhanced antenna should be raised by tripod.
(3) Make sure there is no large area of water or objects intensely interfering the satellite
signal.
(4) Check carefully that there are no high-power radio emission objects surrounded.
And make sure there is no power lines around. Need keep at least 200m far from these
objects.
4.1.2 Set up instrument
Mount the instrument to the tripod. Level and center the instrument precisely to ensure
the best performance. You can set up base on random point or on given point. If you set
base on random point, you just choose a position and level the instrument. If you set
base on given point, you can follow below steps:
(1) Leveling and Centering the instrument
a. Setting up tripod
First, extend the extension legs to suitable length, make the tripod head parallel to the
ground and tighten the screws.
b. Make the center of the tripod and the occupied point approximately on the same
plumb line.
c. Step on the tripod to make sure if it is well stationed on the ground.
(2) Attaching the instrument on the tripod
Place the instrument carefully on the tripod head and slid the instrument by loosening
the tripod screw.
(3) Roughly leveling the instrument by using the circular vial
a. Turn the leveling screw A and B to move the bubble in the circular vial as below
Figure 4-1 shown, in which case the bubble is located on a line perpendicular to a line
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