Weidmuller WI-I/O-9-U2: Wireless Mesh I/O & Gateway User Manual V1.2.2 User Manual
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Typical reliable distances are detailed below, however longer distances can be
achieved if antennas are mounted in elevated locations
– such as on a hill or on a radio
mast.
Using the 900 MHz Spread Spectrum radio the distances achievable will be:
USA/Canada 15 miles - 6dB net gain antenna configuration permitted (4W EIRP)
Australia/NZ 12 km - Unity gain antenna configuration (1W EIRP)
To achieve the maximum transmission distance, the antennas should be raised above
intermediate obstructions so the radio path is true “line of sight”. Because of the
curvature of the earth, the antennas will need to be elevated at least 15 feet (5 metres)
above ground for paths greater than 3 miles (5 km). The modules will operate reliably
with some obstruction of the radio path, although the reliable distance will be reduced.
Obstructions that are close to either antenna will have more of a blocking effect than
obstructions in the middle of the radio path. For example, a group of trees around the
antenna is a larger obstruction than a group of trees further away from the antenna.
Maximum Gain per region
Country
Max Gain (dB)
USA / Canada
6
Australia / New Zealand
0
Europe
0
Typical Antenna Gains
Part No
Antenna
Gain (dB)
DG900
Whip with 15’ (5m) cable
-2
6720005089
Dipole with 15’ (5m) cable
0
SG900-EL
5dBi Collinear (3dBd)
5
SG900-6
8dBi Collinear (6dBd)
8
YU6-900
6 element Yagi
10
YU16-900
16 element Yagi
15
Typical Coax Losses (900MHz)
CC3-SMA
10’ (3m) Cellfoil Coax
-1dB
CC10-SMA
33’ (10m) Cellfoil Coax
-3dB
CC20-SMA
66’ (20m) Cellfoil Coax
-6dB
The WI-I/O 9-U2 module provides a range of test features, including displaying the
radio signal strength. Line-of-sight paths are only necessary to obtain the maximum
range. Obstructions will reduce the range however, but may not prevent a reliable path.
A larger amount of obstruction can be tolerated for shorter distances. For very short
distances, it is possible to mount the antennas inside buildings. All radio paths require