The wireless modem and antenna may be damaged if either come into contact with ground potentials other than the one in the users application. Beware, ground potential are not always what they appear to be.

In the final application, the antenna must be positioned more than 20 cm away from human bodies. When this rule cannot be applied, the application designer is responsible for providing the SAR measurement test report and declaration.

Even if SAR measurements are not required, it is considered good practice to insert a warning in any manual produced, indicating it is a radio product and that care should be taken.

7.4 Installation of the Wireless modem

7.4.1 Where to Install the Wireless modem

The following conditions need to be taken into consideration when designing your application as they might affect the wireless modem and its function:

•Environmental conditions

•Signal strength

•Connection of components to wireless modem

•Network and subscription

7.4.1.1Environmental Conditions

The wireless modem must be installed so that the environmental conditions stated in the Technical Data chapter, such as temperature, humidity and vibration are satisfied. Additionally, the electrical specifications in the Technical Data section must not be exceeded.

7.4.1.2 Signal Strength

The wireless modem 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 wireless modem is to a radio base station. You must ensure that the location at which you intend to use the wireless modem, 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 8.3.5, page 59.

When an application is completed, you can verify signal strength by issuing the AT command AT+CSQ or AT*E2EMM. See the AT Commands Manual for further details.

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