User's Manual

Installation ________________________________________________ Boomer II User Manual & Integrator’s Guide
Wavenet Technology 42 BM210012WT26
Selecting an Antenna
The requirements for the antenna used with the Boomer II OEM
Modem are:
Antenna Gain: 1 dBi (isotropic) maximum average gain
if module FCC approvals are to be used
without separate equipment approval for
the host product.
Impedance: 50Ω
Centre Frequency: 833MHz ± 5MHz
Frequencies of operation: 806 to 825MHz (transmit)
851 to 870MHz (receive)
Acceptable return loss: VSWR < 1.5 or RL < -14dB (recommended)
VSWR < 2.0 or RL < -10dB (minimum)
The power output of the Boomer II OEM Modem is nominally 1.8W at
the antenna port. The antenna gain or loss will affect this value.
Connecting the Antenna
The Boomer II OEM Modem Module provides an MMCX RF
connector located at the top of the unit, to attach to the antenna cable.
The antenna does not plug directly into the modem but uses an antenna
cable to interface between the device and the modem.
The antenna cable should be a low loss, 50Ω impedance and have a
MMCX plug that can mate with the modem’s MMCX socket
(82MMCX-S50-0-2). It is recommended that a Huber+Suhner
connector be used to connect to the modem as below:
q 11 MMCX Straight Connector
q 16 MMCX Right Angle Connector
If an extension cable is required to the antenna, it should be low loss, as
short as possible and an impedance of 50 ohms. Proper matching
connectors should be used, as each connector introduces a return loss
and reduces performance.
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