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Hardware Guide
RF Specifications
Issue 01 (2011-04-08)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
47
4.6.2 Interference
Besides the antenna performance, the interference on the user board also affects the
radio performance (especially the TIS) of the module. To guarantee high performance
of the module, the interference sources on the user board must be properly controlled.
On the user board, there are various interference sources, such as the LCD, CPU,
audio circuits, and power supply. All the interference sources emit interference
signals that affect the normal operation of the module. For example, the module
sensitivity can be decreased due to interference signals. Therefore, during the design,
you need to consider how to reduce the effects of interference sources on the module.
You can take the following measures: Use an LCD with optimized performance;
shield the LCD interference signals; shield the signal cable of the board; or design
filter circuits.
Huawei is able to make technical suggestions on radio performance improvement of
the module.
4.6.3 CDMA Antenna Requirements
The antenna for MC509 must fulfill the following requirements:
CDMA Antenna Requirements
Frequency range
Depending on frequency band (s)provided by the network
operator, the customer must use the most suitable
antenna for that/those band (s)
Bandwidth
80MHz in CDMA800
140MHz in CDMA1900
Gain
Gain < 3dBi
Impedance
50-ohm
Input power
> 24dBm Average power in CDMA
VSWR absolute max
<= 10:1
VSWR recommended
<= 2:1
Furthermore if the device is developed for the US and/or Canada market, it must
comply with the FCC and/or IC requirements:
This device is to be used only for mobile and fixed application. The antenna(s) used
for this transmitter must be installed to provide a separation distance of at least 20cm
from all persons and must not be co-located or operating in conjunction with any
other antenna or transmitter. End-users must be provided with transmitter operation
conditions for satisfying RF exposure compliance. OEM integrators must ensure that
the end user has no manual instructions to remove or install the UC864-E/G/WD
/WDU module. Antennas used for this OEM module must not exceed 3dBi gain for
mobile and fixed operating configurations.