H3C Technologies H3C WA2600 Series WLAN Access Points - Manual (Page 18)

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If there is no parapet on the rooftop, fix the pole to the rooftop surface or a cement pier on the
rooftop with expansion screws and stabilize the pole with steel wires. Then, install the
directional antenna on the pole, as shown in Figure 10 .
Figure 10 Install a directional antenna on a cement pier
Cement pier
Steel wire
Pole
Directional
outdoor antenna
Lightning rod
Pole mounting
bracket
Flat steel bar
To the grounding grid
Steel wire
3. Connect the pole to a grounding grid with a flat steel bar (40 x 4 mm or 1.57 x 0.16 in).
4. Fix the antenna on the pole with the pole mounting bracket.
Installing the omnidirectional antennas on poles
NOTE:
•
The diameter of the poles for omnidirectional antennas must be 50 mm to 70 mm (1.97 in to 2.76 in).
Usually, poles are made of round steel bars 50 mm (1.97 in) in diameter.
• The pole clamp at the top of the pole and the one at the bottom of the antenna must be level, as shown
in
Figure 11 .
• The antennas and the lightning rod must be of such heights that the antennas can provide desired
coverage and remain within the shielding angle (45°) of the lightning rod.
Omnidirectional antennas must be kept at least one meter (3.28 ft) away horizontally from metal objects.
Therefore, do not weld the lightning rod on a pole attached with an antenna. Install the lightning rod on
a separate pole between the two omnidirectional antennas and ensure that the antennas are within the
shielding angle of the lightning rod.