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4. HINTS FOR INTEGRATING THE MODULE
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LZT 123 7263 R1C
Signal Strength
The module has to be placed in a way that ensures sufficient signal
strength. To improve signal strength, the antenna can be moved to
another position. Signal strength may depend on how close the module
is to a radio base station. You must ensure that the location at which you
intend to use the module, is within the network coverage area.
Degradation in signal strength can be the result of a disturbance from
another source, for example an electronic device in the immediate
vicinity. More information about possible communication disturbances
can be found in section 4.3.5, page 74.
When an application is completed, you can verify signal strength by
issuing the AT command AT+CSQ. See “AT+CSQ Signal Strength”,
page 126.
Tip! Before installing the module, use an ordinary mobile telephone to check
a possible location for it. In determining the location for the module and
antenna, you should consider signal strength as well as cable length
Connection of Components to GM47
The integrator is responsible for the final integrated system. Incorrectly
designed or installed, external components may cause radiation limits to
be exceeded. For instance, improperly made connections or improperly
installed antennas can disturb the network and lead to malfunctions in
the module or equipment.
Network and Subscription
• Before your application is used, you must ensure that your chosen
network provides the necessary telecommunication services.
Contact your service provider to obtain the necessary information.
• If you intend to use SMS in the application, ensure this is included in
your (voice) subscription.
• Consider the choice of the supplementary services described in
section “2.3.2 Short Message Service”, page 18.
4.2.2 How to Install the Module
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. An electrolytic
capacitor should be placed close to the power supply pins of the
module to supply the peak currents during burst transmission. See
“VCC - Regulated Power Supply Input”, page 45.
• See section “2.2.1 General Protection Requirements”, page 44.