Intermec MobileLAN 21 Series, Системное руководство

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Installing the 21XX
2-21
2
Positioning Antennas for an OpenAir WAP
If the OpenAir WAP has two radios, you need to use external antennas and position
them at the recommended distances for proper functioning. There are two types of
Intermec-recommended antennas you can use:
•
Omni
•
Directional
You can position the antennas in one of three ways:
•
Horizontal. Both antennas are mounted in the same plane (at the same height).
•
Stacked. One antenna is mounted directly above the other.
•
Angled. The two antennas are mounted some distance apart and at different heights.
You can use two omni antennas, two directional antennas or you can use one omni
antenna and one directional antenna. This table shows the MINIMUM distance that
must exist between the two antennas.
Position 2 Omni Antennas 2 Directional Antennas
1 Omni, 1 Directional
Antenna
Horizontal 3dBi omni, 3 m (10 ft)
6dBi omni, 6.1 m (20 ft)
9dBi omni, 12.2 m (40 ft) 3 m (10 ft) 6.1 m (20 ft)
Stacked 0.6 m (2 ft) (does not apply) 0.6 m (2 ft)
Angled 1.1 m (3.5 ft) vertically and
7.3 m (24 ft) horizontally 0.6 m (2 ft) vertically and
3 m (10 ft) horizontally 0.6 m (2 ft) vertically and
6.1 m (20 ft) horizontally
Note these additional points about positioning your antennas:
•
Mount omni antennas so they point down.
•
If you are using two directional antennas, mount them back-to-back.
•
If you are using one omni antenna and one directional antenna, mount the
directional antenna so that it points away from the omni antenna.
•
If you are using one omni antenna and one directional antenna in the stacked
position, mount the directional antenna above the omni antenna.