Stage 1: Preliminary Survey Chapter 2WinLink™ 1000 User Manual Release 1.9 2-2• CompassStage 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 facil-ity that can store multiple images, for documentation purposes• RF accessories (connectors and cables)• Communication devices (for example, cellular phones, or a set ofwalkie-talkies)Stage 1: Preliminary SurveyA preliminary survey is necessary before visiting potential installation sites.As much detail as possible should be obtained about the two designatedODU installation sites and the area between them.¾To perform a preliminary survey:1. Mark the two designated installation sites on a topographic map of thearea.2. Measure the distance between the sites; check that it is within the speci-fied range of the equipment.3. On the urban map, check for developed areas situated between the twoinstallation sites. Pay attention to these areas when performing the phys-ical site survey; there may be tall buildings, RF towers, or transmitters,which could cause interference to the link.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 RFsignals like a building. This type of reflection causes the receivedamplitude to be reduced. As a rule of thumb, the presence of a largebody of water between the link sites may double the requiredantenna height.5. Determine and record the compass bearings between both ODUs, rela-tive to north.6. If there are obstructions between the two sites, calculate the FresnelZone (see Appendix B for details).7. If the site chosen does not meet requirements, consider alternative sites.
