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9.2 How to install the modem
9.2.1 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.
9.2.2 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 MTX‐3G‐JAVA Terminal modem to the host application using two 3mm
diameter pan‐head screws
9.3 Antenna
9.3.1 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 your application.
9.3.2 Antenna type
Make sure that you choose the right type of antenna for the modem. Consider the following
requirements:
•
The antenna must be designed for one of the frequency bands in use; please ask your
network provider for more information:
o UMTS 800/850/900/1900/2100 MHz
o GSM 850/900/1800/1900 MHz
•
The impedance of the antenna and antenna cable must be 50Ω;
•
The antenna output‐power handling must be a minimum of 2W
www.mtx‐terminals.com
www.mtxm2m.com
MTX M2M® by MATRIX ELECTRONICA S.L.U
MTX‐3G‐JAVA Family
2015/10 v1.6
/
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