Mount The Base Radio Antenna; Measure And Record Instrument Height (Hi) Of Gps Antenna; Figure 4.4 Mounted Base Radio Antenna - ashtech Z-Xtreme System Manual

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Mount the Base Radio Antenna

The radio antenna can be mounted in any location on the base site. The only consid-

eration is cable length. Remember that the radio antenna must be connected to the

radio which is connected to the GPS receiver. The GPS antenna must also be con-

nected to the GPS receiver. The length of the cables will dictate the possible loca-

tions of the radio antenna. A bracket is supplied to allow the mounting of the radio

antenna on the GPS antenna tripod, as shown in Figure 4.4. Alternatively, the radio

antenna can be mounted on its own. Some users will mount the radio antenna on a

tall pole to give more range between the base and rover systems.

Remember that measurements of satellite data are made at the center (horizontally

and vertically) of the GPS antenna. Yet the location of the base point monument is

not at the center of the antenna but below it on the ground. The HI allows the com-

puted position of the antenna center to be transferred to the ground point. It is critical

that the HI of the antenna above the monument is measured accurately. A tool to

measure the HI is included in the base system (Figure 4.5).

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