CalAmp Viper 100 User Manual

Contents

CalAmp Viper 100 User Manual Manual pdf 24 page image

#9 Viper_SC_Manual_001-5008-000_Rev12e.docx | Page 17Figure 10 – Multispeed Illustration2.3 SYSTEM PLANNINGA Site Survey is a propagation study of the RF path between two points or between one point and multiple points. Signalpropagation may be affected by attenuation from obstructions such as terrain, foliage, or buildings in the transmissionpath. A Site Survey is recommended for most projects to determine the optimal RF paths for each link. This is especially truewhen more than one RF coverage area is required. A Site Survey will determine the best unit location for the Relay Points.For a successful installation, careful thought must be given to selecting the site for each radio. Suitable sites should providethe following:Protection from direct weather exposureA source of adequate and stable primary powerSuitable entrances for antenna, interface, or other cablingAntenna location with an unobstructed transmission path to all remote radios in the system2.3.1 UNDERSTANDING RF PATH REQUIREMENTSRadio waves are propagated when electrical energy produced by a radio transmitter is converted into magnetic energy byan antenna. Magnetic waves travel through space. The receiving antenna intercepts a very small amount of this magneticenergy and converts it back into electrical energy that is amplified by the radio receiver. The energy received by thereceiver is called the Received Signal Strength Indication (RSSI) and is measured in dBm.