Sony Ericsson GM47, GM48 manual How to Install the Module

4. HINTS FOR INTEGRATING THE MODULE

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.

4.2.2How 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.

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