User's Manual

Installation_________________________________________________ Boomer II User Manual & Integrator’s Guide
Wavenet Technology 40 BM210012WT25
transitions will occur at the same time as the low battery event occurs
(or would occur if the event was activated). Note that in the case of a
very fast transition between voltages, it may take up to 20 seconds for
the modem to confirm a change in battery status.
Message Waiting
The Message waiting signal is held active low whenever there is at
least one complete message waiting in the outbound buffers (including
the reread buffer).
In-Range
The In Range signal is held active low whenever the modem is in
range. It tracks the function of the Data Carrier Detect (DCD) signal.
Selecting & Positioning the Antenna
Use this information to assist you in selecting the appropriate antenna
to incorporate into your product package. For specific detailed
information, Wavenet recommends that you use the expertise of an
antenna design engineer to solve individual application concerns.
Antenna Safety
The design of the integrated product must be such that the location
used and other particulars of the antenna comply with the appropriate
standards of the country in which the host device or terminal is to be
used.
The integrator should refer to the statement of Compliance on page 12
of this manual and Regulatory Requirements section on pages 23-27
for country requirements.
Mobile and Portable Devices
In the environment where portable devices are in use, many variables
exist that can affect the transmission path. In this case, it would be
preferable to use a vertically polarized, omni directional antenna.
Antennas for portable devices include the following designs:
Internal antenna (invisible or pull-up)
An internal antenna must provide a gain sufficient to meet network
specifications. Cable routing from the modem to the antenna needs to
avoid RF sensitive circuits and high level, high-speed clock circuits.
Consider:
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The location of the antenna to avoid RFI to a computing device.
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Good shielding to the display and other RF-sensitive
components
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The most efficient method of cable routing
Otherwise, antenna gain can be offset by cable loss. A typical coaxial
cable is very thin, such as RG178B used in portable devices, and cable
loss can be 1dB or more per metre. Some coaxial cable manufacturers