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RTK Radio 450 Performance
Continued onnext page BA31779,00001BF -19-18MAY11-1/2
Line of Sight
Line of sight is the direct path between two points,
free of obstacles. For the RTK application, this is the
line between the base and vehicle antennas. Typical
obstructions include:
•
Trees and foliage
•
Buildings or other man-made objects
•
Terrain variation, such as hills or valleys
•
Curvature of the Earth
The higher RF power of RTK Radio 450 will reduce
attenuation due to plants and small variations in terrain.
Blockage due to man-made objects can be reduced
through planning of the base antenna location. Similar
to analysis performed to locate the StarFire™ receiver
installation, the transmitting antenna should be located
away from nearby obstructions.
To deal with obstructions away from the base, small terrain
variations and the curvature of the Earth, the antenna
should be placed as high as possible. The local spectrum
authority will limit the range and potential interference of
the base station signal by setting a maximum power and
maximum antenna height. End users should install their
base antenna to the maximum height allowed for best
performance.
StarFire RTK™ retains its published accuracy to 12 mi.
(20 km). If consistent with the granted site license, it is
recommended that antennas are mounted ≥ 30 m (100
ft.) to ensure the full range of coverage. The table below
relates the base antenna height to the line-of-sight to the
base radio horizon.
BaseHeight
Base
Station
Radio
Horizon
Base
Height
Base
Station
Radio
Horizon
Line of
Sight
ft. mi. m km
148 16.3 45 26.3
131 15.4 40 24.8
125 15.0 38 24.2
115 14.4 35 23.2
Strong
98 13.4 30 21.5
82 12.2 25 19.6
Good
66 10.9 20 17.6
49 9.4 15 15.2
Marginal
33 7.7 10 12.4
20 6.0 6 9.6
10 4.2 3 6.8
5 3.0 1.5 4.8
Poor
Antenna Height
RTK Shared Base Station: Antenna Height
PC9393 —UN—23OCT06
In order to maintain a good RTK Radio link, the antenna
must be mounted high enough to radiate over the earth’s
curvature and any obstacles. As shown in the gure, the
curve of the earth can block the signal from the RTK link.
If the radiating base station radio antenna is mounted too
low, the broadcasting range will be drastically reduced.
StarFire is a trademark of Deere & Company
StarFire RTK is a trademark of Deere & Company
40-3
092711
PN=30