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Calculating Range & Clearance
The Dynamic Range Budget
Outdoor Antenna Installation Guide D-7
The values listed in Table D-3 are based upon calculations that
assume optimal radio conditions. There is no guarantee that the
same maximum distance can be achieved at your location.
Different performance figures may result from:
• Sources of interference or unexpected reflections in the signal
path that affect the communications quality of the radio signal
(see
Antenna Placement
on page 2-11).
• Incorrect antenna alignment (see page 2-17).
When selecting equipment for an outdoor antenna link, make sure
you consider an extra safety margin for the maximum range of 100
m (300 ft) or more.
NOTE
The minimum clearance in Table D-3 on page D-6 should be
interpreted as follows:
•
In open areas without obstacles in the signal path,
clearance is measured as height above the surface
of the earth. For example, if the antenna is mounted
on the roof, this height includes the height of the
building plus the height of the mast above the
rooftop.
•
In areas with obstacles in the signal path between
the two antenna(s), the clearance should be
measured as height above the highest obstacle(s) in
the signal path.
•
In dense urban areas, the clearance should be
measured as height above the highest rooftop or
any other obstacle(s) in the signal path between the
two antennas.