Broaden RTK availability with repeaters
RTK repeaters are radios that can be used to improve base station signal coverage around obstacles, such as trees or rolling terrain. The purpose of the RTK repeater is to receive the correction signal coming from the base station and then transmit that correction signal.
More than one repeater can be used with one base station, but the repeater cannot receive signal from each other in a daisy-chain configuration. In order to operate, a repeater must be connected to a 12-V power source.
A repeater is the same as the radio that is on a machine or base station receiver.
A repeater consists of the following:
RTK from John Deere provides highly accurate, repeatable corrections from global positioning system (GPS) to John Deere's suite of precision ag applications. RTK utilizes a local, ground-based reference station that transmits the high-accuracy corrections to a StarFire™ Receiver on a machine via RTK radios.
StarFire RTK accuracy depends on the distance between the base station and the machine. The shorter the distance, the more accurate the system will be. In general, the accuracy of StarFire RTK is described below.
Dealers across Australia and New Zealand have set up a robust RTK network.
Contact a local John Deere dealer to inquire about RTK network coverage.
RTK accuracy provides many benefits to the user as well as highly accurate corrections to a suite of John Deere precision solutions. Receivers utilizing this type of signal correction have repeatable +/- 2.5-cm (1-in.) horizontal pass-to-pass accuracy and +/- 5-cm (2-in.) vertical pass-to-pass accuracy.
Base stations using John Deere RTK Radio 900 are very easy to set up for several reasons:
The John Deere RTK Radio 900 operates in the 902-MHz to 928-MHz frequency range. This range does not require a license from the U.S. Federal Communications Commission (FCC), so the base station can be set up anywhere as long as it does not broadcast more than 4 W of power.
For more information on FCC regulations of the 902-MHz to 928-MHz range, visit www.fcc.gov or talk to a local John Deere dealer.
A John Deere RTK Radio 900 base station can be used in a mobile setup or mounted permanently to a building, concrete silo, or radio tower. Depending on the operation, either type of mounting can be used:
If a producer using RTK discovers a signal hole where the signal is lacking, a repeater radio can be easily set up to help fill the gap.
With many RTK solutions, automatic guidance simply stops working if trees or rolling terrain interfere with the line of sight between the base station and the machine. That is not the case when using RTK with John Deere, thanks to RTK Extend capability.
RTK Extend is an industry-exclusive feature of John Deere RTK. This allows AutoTrac™ steering system to keep functioning for up to 15 minutes with RTK accuracy without line of sight to the base station.
RTK and StarFire 3000 Receiver
When using StarFire 3000 Receivers, the machine receiver automatically goes to the SF2 signal when RTK Extend expires. This allows operators to take advantage +/- 5 cm (2 in.) horizontal pass-to-pass accuracy along tree lines or hilly terrain. The availability of SF2 provides RTK users with the best available accuracy by lessening the impact of any given field condition.
The machine will transition from RTK to RTK Extend, to SF2, and back to RTK without disengaging AutoTrac steering system.
NOTE: The base station must be powered on for at least one hour for RTK Extend to function.