Antenna Installation Factors - Wi-LAN Hopper Plus 120-24 Installation And Configuration Manual

Antenna Installation Factors

Some factors you should consider when installing antennas into your wireless system are listed below.
Factor
Maximizing the
Hopper Plus
120-24's
Capabilities
Safety
EIRP
Fade Margin
LOS
DEC 2000 Rev 02
Description
• Minimize obstructions in the radio path
• Line Of Sight (LOS) is crucial for reliability
• Ensure that equipment is installed correctly
• Ensure proper grounding, testing, and alignment of antennas
• Install in environmental conditions that are suitable for the Hopper unit
• Select proper antennas and cable for the application
• Ensure sufficient gain for the intended application
• Proper grounding of antenna apparatus in accordance with respective
Electrical Code(s) is crucial
• Wi-LAN recommends using a surge arrestor where the antenna cable
enters the building
• All installations should be completed by a qualified and competent RF
technicial
• Effective Isotropically Radiated Power (EIRP)
• EIRP is the amount of power that is transmitted to the air from the
antenna
• EIRP levels depend on the power of the radio transmitter, the size of the
antenna, and the losses incurred in the antenna cable
• To remain license-exempt the EIRP must remain under 4 W or 36 dBm in
Canada and the United States for point-to-multipoint applications. In
Europe, this value is reduced to 100 mW or 20 dBm.
Note: EIRP = Power out of unit – Power lost in cable + Gain in power from
Antenna
See Calculating a Link Budget, page 109
• Line of Sight (LOS)
• LOS is a football shaped pattern known as the Fresnel Zone, which must
be kept clear of obstructions. See
information
• Visual line of sight must be achieved. When standing at the antenna
position, you must be able to see the remote antenna
Fresnel Zone, page 111 for more
Antenna Basics
117