User manual

605M-D1 GPRS Modem User Manual
man_605M-D1_1.5.doc Page 10
2.4 Antenna Port
The ELPRO 605M-D1includes a SMA bulkhead female, class 4 (2W)
co-axial connector for the external antenna.
NOTE: BEFORE connecting the ELPRO 605M-D1 to a Power Supply
source, a suitable Antenna shall be connected and properly installed.
The antenna has to be installed with care in order to avoid any
interference with other electronic devices and has to guarantee a
minimum distance from persons (20 cm). In case this requirement
cannot be satisfied, the system integrator has to assess the final
product against applicable SAR regulations.
For good efficiency of the antenna and minimum interference with other electronic systems, a space of min. 40 cm
around the radiating part should be free, at least of electrically conducting materials (except the ground plane on
which it is attached).
Less distance and less obstacles there are between the antenna connected to the ELPRO 605M-D1and the antenna
of the GSM/GPRS network base station, the less power is radiated by the Terminal under normal conditions and the
higher is the safety margin in case of disturbances.
A check of eventual interferences can be made when the ELPRO 605M-D1transmits at maximum power level to
register to a GSM 900 network (see frequency channel numbers), immediately after being switched on.
Antenna Type
For best performance, ensure the antenna is of the correct type.
Frequency range Standard Dual Band GSM/DCS frequency range or Standard Quad Band GSM/DCS/PCS
frequency range if used for all four bands
ELPRO provides the CFD890-EL antenna for this application.
2.5 Ground Terminal
A Ground Terminal is provided on the back of the
module. This Terminal should be connected to the
Main Ground point of the installation in order to
provide efficient surge protection for the module
(refer to the Installation Diagram).