HINTS FOR INTEGRATING THE RADIO DEVICE
57
LZT 123 8020 R1A
Note!
AGND and DGND are connected at a single point inside the
radio device. They must
not
be joined together in your
application.
Audio
Use a coupling capacitor in ATMS line if the application does
not use the radio device’s bias voltage. See also Figure 5.5
Microphone connections to the radio device, page 32.
Software Upgrade
To upgrade the software, the system connector must be
accessible in your application. The pins SERVICE, TD2, RD2
and the power signals are used for this purpose. Please contact
customer support for more details.
7.3 Antenna
7.3.1
General
The antenna is the component in your system that maintains
the radio link between the network and the radio device. 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 the application.
7.3.2
Antenna Type
Make sure that you choose the right type of antenna for the
radio device. Consider the following requirements:
•
the antenna must be designed for the dual frequency bands
in use:
All manuals and user guides at all-guides.com
