Figure 9: Working Around Obstructions - Geokon GeoNet 8800 Series Instruction Manual

established direct radio communication. The figure below shows how GeoNet
devices can operate around buildings or other barriers using hops.
9:
1 Hop
1 Hop
1 Hop
Obstruction

FIGURE 9: Working Around Obstructions

When using GeoNet, it is important to understand the effect that obstructions
have on radio signals. Obstructions between two antennas can cause reflections
of the transmitted signal. When these reflections arrive at the receiving antenna,
they may be in or out of phase with the signal that took a straight-line path. This
reflected signal may act as constructive or destructive interference with the
received signal. For optimum performance, recommends creating as
GEOKON
much vertical space as possible between the straight-line path and obstacles,
including the ground.
The Fresnel zone must be at least 60% obstruction-free to ensure optimal
wireless communication.
The figure below illustrates the Fresnel zone.
MODEL 8800 SERIES GEONET WIRELESS DATA ACQUISITION NETWORK | INTRODUCTION | 5