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4     Setup Guidelines
36     SPSx51 Modular GPS Receivers User Guide
reference station system. The connection is provided by an integrated radio, a cellular 
modem in the controller, or through an external cellular phone that is connected to 
the receiver either by Bluetooth wireless technology or by means of a cable.
The correction stream for some other positioning solutions, such as SBAS 
(WAAS/EGNOS/MSAS) and the OmniSTAR service
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, is broadcast through 
geostationary satellites, and detected by the GPS antenna itself. No integrated radio or 
base station is required.
Rover receiver components
The rover receiver has the following components:
GPS receiver
GPS antenna
Optional integrated radio receiver and antenna for RTK operations
Optional items for the different mounting options (see below)
In most rover applications, the receiver operates entirely from its own integrated 
battery unit. On a vehicle or on a marine vessel, however, an external power supply can 
be used. Use an external power supply if one is provided. The internal battery then acts 
as a uninterruptible power supply, covering any external power failures.
Choose a rover receiver according to the needs of the job:
A Smart GPS antenna, such as the SPSx81, incorporates the GPS receiver, GPS 
antenna, power supply, and receive radio into a single compact unit. A Smart 
GPS antenna can be rapidly set up on a pole, vehicle, or backpack. This makes it 
easy to carry when you are measuring around the jobsite. 
A Modular GPS receiver, such as the SPSx51, incorporates the GPS receiver, 
receive radio, and power supply into a single unit. The GPS antenna and, 
optionally, the receive radio antenna, is separate from the receiver. When you 
use a modular GPS receiver as a rover, you can use optimized components 
placed in the best locations for your application. For example:
A small, lightweight rover antenna can be mounted on a pole or backpack; 
placed in a high, inaccessible location on a marine vessel mast or cabin; or 
placed on a site vehicle roof or truck bed.
A rubber duck radio antenna, or an external radio antenna, can be 
mounted on a vehicle or vessel roof to provide maximum coverage.
A Modular GPS receiver can be placed in a location that is both easily accessible 
and safe from theft and the weather. The antennas can be placed high on a 
vehicle or vessel roof, clear of obstructions and able to deliver maximum 
performance.
1.  
OmniSTAR is available only with the SPSx51 Modular GPS receivers.