Ag Leader Base Station Hardware Manual - Manual (Page 60)

58 AutoSteer System
Introduction to A5 and AFLink Repeaters
Introduction to A5 and AFLink Repeaters
There are two versions of the Repeater. They are the A5 Repeater and the AFLink Repeater. The A5 Repeater works with all
the Base Stations versions that use the 900 MHz radio modem. The AFLink Repeater works with all the Base Station versions
that use the 400 MHz AFLink radio modems. Both versions allow the Base Station signal to be broadcasted around obstacles;
however there are some differences in the way the different radios work. This chapter will explain how both the A5 and
AFLink Repeaters work in general and then also explain the specific limitations of each model.
Repeater Concepts
For RTK applications, the Base Station GPS Receiver receives GPS satellite signals and then transmits precise positioning
data to the vehicle via its radio modem link. The radio modem link requires a line-of-sight between the vehicle and the Base
Station. In some cases there may be an obstruction such as trees, buildings, or hills between the Base Station and the vehicle.
When this condition occurs, it is necessary to find a way to transmit the Base Station signal around the obstacle.
A repeater is a stand alone radio data modem that is placed in an area that is visible from both the Base Station and the vehicle.
The repeater receives the signal from the Base Station and then retransmits it to the vehicle. Repeaters can be used to fill in the
Base Station coverage area. However, they cannot be used to extend sub-inch coverage beyond the maximum Base Station
range of approximately 6 miles (9.7 km) from the Base Station's GPS Antenna. The repeater requires only a 12-Volt power
source and a fixed radio antenna to operate.
Before using a repeater, it must be programmed to work with your particular Base Station.
•
A5 Repeaters must be set to the same channel as the Base Station. The radio channel should be set by the factory, but it can
also be set by your dealer.
•
AFLink Repeaters must be set to the corresponding Base Station frequency. The frequency should be set by the factory, but
it can also be set by your dealer.