CEP AG
Revision 1.2
_________________________________________________________________________________
__________________________________________________________________________________________
Page 19 of 28
5.2 How to install the modem
5.2.1 Power supply
Use a high-quality power supply cable with low resistance. This ensures that
the voltages at the connector pins are within the allowed range, even during
the maximum peak current.
When the unit is powered from a battery or a high current supply, connect a
fast 1.25A fuse in line with the positive supply. This protects the power cabling
and modem.
5.2.2 Securing the modem
Before securing the modem take into account the amount of additional space
required for the mating connectors and cables that will be used in the application.
Where access is restricted, it may be easier to connect all the cables to the
modem prior to securing it in the application.
Securely attach the GT864-QUAD/PY Terminal modem to the host application
using two 3mm diameter pan-head screws
5.3 Antenna
5.3.1 General
The antenna is the component in your system that maintains the radio link between
the network and the modem. Since the antenna transmits and receives
electromagnetic energy, its efficient function will depend on:
• the type of antenna (for example, circular or directional);
• the placement of the antenna;
• communication disturbances in the vicinity in which the antenna operates.
In the sections below, issues concerning antenna type, antenna placement, antenna
cable, and possible communication disturbances are addressed. In any event, you
should contact your local antenna manufacturer for additional information concerning
antenna type, cables, connectors, antenna placement, and the surrounding area.
You should also determine whether the antenna needs to be grounded or not. Your
local antenna manufacturer might be able to design a special antenna suitable for the
application.
5.3.2 Antenna type
Make sure that you choose the right type of antenna for the modem. Consider the
following requirements:
