#9 Viper_SC_Manual_001-5008-000_Rev12e.docx | Page 17
Figure 10 – Multispeed Illustration
2.3 SYSTEM PLANNING
A Site Survey is a propagation study of the RF path between two points or between one point and multiple points. Signal
propagation may be affected by attenuation from obstructions such as terrain, foliage, or buildings in the transmission
path. A Site Survey is recommended for most projects to determine the optimal RF paths for each link. This is especially true
when 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 provide
the following:
Protection from direct weather exposure
A source of adequate and stable primary power
Suitable entrances for antenna, interface, or other cabling
Antenna location with an unobstructed transmission path to all remote radios in the system
2.3.1 UNDERSTANDING RF PATH REQUIREMENTS
Radio waves are propagated when electrical energy produced by a radio transmitter is converted into magnetic energy by
an antenna. Magnetic waves travel through space. The receiving antenna intercepts a very small amount of this magnetic
energy and converts it back into electrical energy that is amplified by the radio receiver. The energy received by the
receiver is called the Received Signal Strength Indication (RSSI) and is measured in dBm.
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