Technical data

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It is recommended that the integrator use a cable with a maximum
resistance of 5 milli ohm for the ground connection.
NOTE
AREF and GND are connected at a single point inside the Wireless C
They must not be joined together in the application.
PU®.
6.4.2.3 Audio
Use coupling capacitors on MICIP / MICIN lines if the application does not use the
Wireless CPU®’s bias voltage. See also
4.9.3 Microphone Signals (MICIP, MICIN).
6.4.2.4 Software Upgrade
There is one way of updating the firmware in the GR64. This is an Updater, which is a
local application that downloads an image provided by Wavecom.
6.5 Antenna
6.5.1 General
The antenna is the component in the users system that maintains the radio link
between the network and the Wireless CPU®. Since the antenna transmits and receives
electromagnetic energy, its efficient function will depend on:
• Type of antenna (for example, circular or directional)
• 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, users should contact their local antenna manufacturer for additional
information concerning antenna type, cables, connectors, antenna placement, and the
surrounding area. Users should also determine whether the antenna needs to be
grounded or not. Usually, a local antenna manufacturer should be able to design a
special antenna suitable for the integrators application and environment.
GR64 Integrators’ Manual
Page: 89/106