2.7.3 Site PlanningChoosing the best site for the CS requires careful planning and testing of essential areas. The best locationmay not always be convenient for installation. Read the following information before installing the unit.Understanding Radio WavesCharacteristics of Radio WavesThe transmission of radio waves and the CS coverage area depend on the structure and materials of thebuilding.Office equipment, such as computers and fax machines, can interfere with radio waves. Such equipment maycreate noise or interfere with the performance of the PS.The illustration below shows the special transmitting patterns of radio waves.1. Radio waves are reflected by objects made of materials such as metal.2. Radio waves are diffracted by objects such as metallic columns.3. Radio waves penetrate objects made of materials such as glass.CSColumn3. Penetration2. Diffraction1. ReflectionRelationships Between Radio Waves and Building Structure and Materials• The CS coverage area is affected more by the building materials and their thickness than the number ofobstacles.• Radio waves tend to be reflected or diffracted by conductive objects and rarely penetrate them.• Radio waves tend to penetrate insulated objects and are rarely reflected by them.• Radio waves penetrate thin objects more than thick objects.• The table below shows the transmission tendency of radio waves when they reach objects made fromvarious materials.Object Material Transmission TendencyWall Concrete The thicker they are, the less radio waves penetrate them.Ferroconcrete Radio waves can penetrate them, but the more iron there is, the moreradio waves are reflected.126 Installation Manual2.7.3 Site Planning
