User's Manual

Boomer II User Manual & Integrator’s Guide _________________________________________________Installation
BM210012WT27 43 Wavenet Technology
Positioning the Antenna
Positioning the antenna will affect the gain provided by the antenna.
The antenna should be orientated so that it provides vertical
polarisation as the DataTAC network is based on vertically polarised
radio-frequency transmission.
The antenna should be located as far from the active electronics of the
computing device as possible. Typically, a metal case of a computing
device and its internal components may attenuate the signal in certain
directions. This is undesirable as the sensitivity and transmit
performance of the Boomer II would be reduced. However, careful use
of metal used for the ground plane for an antenna can improve the
antenna gain and the coverage area for the system.
If your device is designed to sit on a surface, the antenna should be
positioned as far from the bottom of the device as possible. This is to
reduce the radio frequency reflections if the device is placed on a metal
surface.
If your device is hand held or is worn next to the body, the antenna
should be positioned to radiate away from the body.
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.
Source Based Time Averaging Function
For portable or handheld applications the integrated terminal or host
must comply with OET Bulletin 65 and Supplement C (June 2002)
with respect to Specific Absorption Rate (SAR) requirements.
The Boomer-II modem module operates on a packet data network
which sets the timing of most aspects of the RF signalling protocol.
The shortest transmit event over which the Boomer-II modem has
control is a transmit transaction which is comprised of a series of
transmit pulses.
For portable or handheld applications a source based time averaging
function has been incorporated in the Boomer-II modem firmware.
This function limits the transmit duty cycle by controlling the timing of
when transmit transactions are initiated and the delay period between
them.
When a data transmission occurs, the actual transmit time is recorded.
Subsequent data transmissions are inhibited until a delay period (idle
time) has elapsed to ensure the average duty cycle of transmissions is
less than the preset “Duty Cycle” limit. Any delayed user data that is to
be transmitted will be buffered until it is permitted to be sent.