User Manual

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2.0 INSTALLATION AND START-UP
2.1 Installation and Start-Up
Before installation, the installer shall have a thorough knowledge of the application. The
read locations need to be defined; whether the object is moving or stationary needs to be
determined. If the objects in question are moving objects, their speed is important for
determining the scan interval. The read locations need to be sufficiently spaced. A general
rule of thumb is that the distance between two i-PORTs should be at least double the read
range of the i-PORTs (or double the distance required) to prevent interference between the
i-PORTs.
Mounting Site:
The i-PORT should be mounted as close as possible to the read location as lengthy antenna
cables reduce the range of the system. For example, a typical 10-meter RG58 coaxial
cable causes a loss of 6 dB of RF power. This in turn means a reduction by 50% in output
power and range (see diagrams).
Cable loss as a function of cable length is displayed in the above diagram. The values are
based on an RG58 coaxial cable at a frequency of 900 MHz.
Cable Length vs. Cable Loss
0.00
2.00
4.00
6.00
8.00
10.00
12.00
0.005.0010.0015.0020.00
Cable Length (m)
Cable Loss (dB)
Cable Loss / dB