Motorola PTP 500 User's Guide download pdf (Page 54)

4 Planning Considerations

4.6 Site Selection Criteria

The following are guidelines for selecting the installation location of the ODU and PIDU Plus

for a PTP 500 Series Bridge.

4.6.1 ODU Site Selection

When selecting a site for the ODU the following should be taken into consideration:

• It should not be possible for people to stand or walk in front of the antenna

• Height and location to achieve the best radio path

• Height in relation to other objects with regard to lightning strikes

• Aesthetics and planning permission issues

• Distance from the ODU and connected Network equipment (Maximum cable run from the

ODU to the connected equipment is 100m [330 ft])

• The effect of strong winds on the installation – see Section 4.7 “Wind Loading”.

4.6.2 PIDU Plus Site Selection

When selecting a site for the PIDU Plus the following should be taken into consideration:

• Availability of a mains electricity supply

• Accessibility for viewing status indicators and pressing Recovery switch.

4.7 Wind Loading

Antennas and electronic equipment mounted on towers or pole mounted on buildings will

subject the mounting structure to significant lateral forces when there is appreciable wind.

Antennas are normally specified by the amount of force (in pounds) for specific wind

strengths.

The magnitude of the force depends on both the wind strength and size of the antenna.

4.7.1 Calculation of Lateral Force

The PTP 500 Series bridge with or without the integral antenna is essentially a flat structure

and so the magnitude of the lateral force can be estimated from:

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Motorola PTP 500 User's Guide Page 54