User Manual

VoiceXtender Modem Installer’s Guide
System Planning
2-2 Rev. A - 8/97
Introduction
The installation procedure and effectiveness of the radio link vary depending
upon the following items:
❚ Type of antenna used
❚ Distances, height, and line-of-sight between the antennas
❚ Distance between the modem and antenna.
The following sections provide guidelines on how to prepare for the
installation and successful operation of VoiceXtender (VX) modems, and include
examples of typical applications.
Antenna Options
VX modems can be used with omnidirectional or directional antennas. These
antennas are typically mounted on the roof of a building and are connected to
the VX modem with 50 Ohm coaxial cable.
Omnidirectional Antennas
An omnidirectional antenna is capable of transmitting or receiving signals from
all directions in a horizontal plane, with equal power in each direction. It is
similar to dropping a stone in a pool and seeing rings emanating from the center.
Refer to Figure 2-1.
Figure 2-1
Omnidirectional Antenna