• Link Budget Calculator and/or Radio Planner
Stage 2: Physical Survey
• 100 meter tape measure
• Ohmmeter, to check ground connection
• Binoculars
• Map
• Digital camera
• Paper, pencil, and a clipboard
• GPS device (optional)
• Compass (optional)
Stage 3: RF Survey
• Spectrum Analyzer with Max Hold function and screen capture facility that can store
multiple images, for documentation purposes
• RF accessories (connectors and cables)
• Communication devices (for example, cellular phones, or a set of walkie-talkies)
Stage 1: Preliminary Survey
A preliminary survey is necessary before visiting potential installation sites. As much detail as
possible should be obtained about the designated ODU installation sites and the area
between them.
To perform a preliminary survey:
1. Mark the designated installation sites on a topographic map of the area.
2. Measure the distance between the sites; check that it is within the specified range of
the equipment.
3. On the urban map, check for developed areas situated between the installation sites.
Pay attention to these areas when performing the physical site survey; there may be
tall buildings, RF towers, or transmitters, which could cause interference to a sector.
4. Check the area between the two sites for obstructions such as:
• High ground - hills or mountains
• Lakes or large bodies of water. Water has a reflection effect on RF signals like a
building. This type of reflection causes the received amplitude to be reduced. As
a rule of thumb, the presence of a large body of water between sector sites may
double the required antenna height.
5. Determine and record the compass bearings between HBS and HSU ODUs, relative to
north.
6. If there are obstructions between the two sites, calculate the Fresnel Zone (see
Chapter 15 for details).
7. If the sites chosen do not meet requirements, consider alternative sites.
8. Use the Link Budget Calculator (on the CD supplied with the equipment or using the
RADWIN Manager) to determine the expected performance.
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