User's Manual

i-PORT MB – Manual
Version 1.1 02.02.2007 Page 11/ 37
Cable losses as a function of cable length are displayed in the above diagram. The values are based on an
RG58 coaxial cable at a frequency of 900 MHz.
In the diagram above, the relative range is displayed as a function of the cable length. Relative because the
range is dependent on the environment of the system. Under ideal conditions (free field, i-PORT R2), ranges
of up to 100 meters (300 feet) can be achieved. But if 20 meters of antenna cabling are used, the cable
losses amount to approx. 12 dB, which reduces the original range to just one-quarter (25 meters)!
The range losses as displayed in the diagram are independent of the original range. If the range is 30 meters
(100 feet) and 10 meters of antenna cabling are used, the range is reduced by 50%.
After mounting the i-PORT MB, the antennas need to be installed and connected to the designated antenna
sockets. If antenna extension cables are required, check these for function or short circuits before you begin
with the start-up.