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Chapter Two
Installation
Page
11
Chapter Two INSTALLATION
2.1
General
The WI-MOD-9-D module is housed in an rugged aluminum case, suitable for DIN-rail
mounting. Terminals will accept wires up to 12 gauge (2.5 sqmm) in size.
All connections to the module must be SELV. Normal 110-240V mains supply should not
be connected to any terminal of the WI-MOD-9-D module.
Refer to Section 2.3
Power
Supply
.
Before installing a new system, it is preferable to bench test the complete system. Configuration
problems are easier to recognize when the system units are adjacent. Following installation, the
most common problem is poor communications caused by incorrectly installed antennas, or radio
interference on the same channel, or the radio path being inadequate. If the radio path is a
problem (ie path too long, or obstructions in the way), then higher performance antennas or a
higher mounting point for the antenna may rectify the problem. Alternately, use an intermediate
WI-MOD-9-D Module as a repeater.
The foldout sheet WI-MOD-9-D
Installation Guide
provides an installation drawing appropriate
to most applications. Further information is detailed below.
Each WI-MOD-9-D module should be effectively earthed via the "GND" terminal on the WI-
MOD-9-D module - this is to ensure that the surge protection circuits inside the WI-MOD-9-D
module are effective.
2.2
Antenna Installation
The WI-MOD-9-D module will operate reliably over large distances. The distance which may be
reliably achieved will vary with each application - depending on the type and location of
antennas, the degree of radio interference, and obstructions (such as hills or trees) to the radio
path. Typical reliable distances are :
USA/Canada 15 miles
6dB net gain antenna configuration permitted (4W ERP)
Australia/NZ 12 km
unity gain antenna configuration (1W ERP)
Longer distances can be achieved if one antenna is mounted on top of a hill.
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 which are close to either
antenna will have more of a blocking affect 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. The WI-I/O 9-x modules provide a test feature which displays the radio
signal strength.