User's Manual

905U-K Radio Telemetry Module User Manual
 ELPRO Technologies Pty Ltd 2001 Page 18
3 HARDWARE INSTALLATION
WARNING! All connections to the 905U-K must be SELV only. 110/220/240V mains
power must NOT be connected to any input terminal of the 905U-K module!
The 905U-K module is housed in a weatherproof enclosure with external power and input
signals connected via a weatherproof connector at the bottom of the module.
Wires of up to 0.75 sqmm may be connected by soldering to the female connector supplied
with the unit. The antenna/coaxial cable connector is a SMA at the top of the module. Care
should be taken to ensure that this connection remains weatherproof, as the ingress of water
will decrease radio performance. If necessary, wrap the connection with weatherproofing
tape.
Before installing a new system, it is preferable to bench test the complete system as
configuration problems are easier to recognise when the system units are close together.
Following installation, poor communications can be caused by:
• Incorrectly installed antennas
• Radio interference on the same channel
• Obstructions in the radio path
• Radio path too long
If the radio path is a problem, higher performance antennas or a higher mounting point for the
antenna may help. Alternately, use a 905U module as a repeater.
The foldout sheet 905U-K Installation Guide is included with the product, with more detailed
information in the following sections: