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SPSx51 Modular GPS Receivers User Guide 43
Setting up the Receiver 5
Note – “Tx” indicates that the radio transmits corrections. “Rx” indicates that the receiver
receives corrections. “Tx/Rx” indicates that the radio both transmits and receives
corrections.
If the receiver does not have an internal transmit radio, or you want to connect to
higher power or to a secondary external transmit radio or cellular modem, use the
26-pin port, the Lemo port, or Bluetooth wireless technology.
The receiver supports the following Trimble base radios:
• SiteNet
™
450
• TRIMMARK
™
3
• TRIMTALK
™
450
• Trimble SNB900
• Trimble PDL450
• Trimble HPB450
The receiver also supports third-party transparent radios and third-party cellular
modems.
When used with an SPSx51 GPS receiver, most external radios require an external
power source. Only the Trimble SNB900 radio-modem has an internal battery and does
not require external power.
Configure the external radio separately, using either the configuration program for the
external radio or the radio display and keypad.
To configure the receiver for RTK operation, follow the base setup procedure to set the
following parameters:
• Set the base station coordinates
• Enable the RTCM or CMR+
™
corrections stream on the selected serial port.
Common ways to set up a base station
You can set up a base station in different ways depending on the application, coverage
area, degree of permanence versus mobility, and available infrastructure. Before you set
up a base station, please read Chapter 4, Setup Guidelines.
Setting up a base station for permanent or semi-permanent installation
For construction applications, where machine and site positioning operations using
GPS will be carried out over a long time (weeks, months, or years), ensure that you
choose the base station location carefully.
A semi-permanent or permanent base station helps to eliminate the types of error that
can result from repeated daily setups, and ensures that you always use the GPS
antenna at the exact original location. The requirement for a permanent base station
setup increases as more receivers that use the base station as a source of corrections,
increases the cost of any base station downtime.