User's Manual

SPSx50 Modular GPS Receiver User Guide 45
Setting up the Receiver 5
External Radio Modems
SPSx50 receiver
The most common data link for Real-Time Kinematic (RTK) operation is a radio. The
SPSx50 receiver is available with the following internal radios:
• 410–430 MHz (Tx/Rx, Rx only, or Tx only)
• 430–450 MHz (Tx/Rx, Rx only, or Tx only)
• 450–470 MHz (Tx/Rx, Rx only, or Tx only)
• 900 MHz (Tx/Rx, Rx only, or Tx only)
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 SPSx50 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 phone, use the
26-pin port, the Lemo port, or Bluetooth wireless technology.
The SPSx50 receiver supports the following Trimble base radios:
• TRIMMARK 3
• Trimble SNB900
• Trimble PDL450
• Trimble HPB450
The SPSx50 receiver also supports third-party transparent radios and third-party
cellular modems.
When used with an SPSx50 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 SPSx50 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
ACU
Table 5.1 Connecting to a Trimble controller running the SCS900 Site Controller software
Controller Cable
connectors
Connect this
cable to …
Part number