HINTS FOR INTEGRATING THE RADIO DEVICE
58
LZT 123 8020 R1A
E-GSM900/GSM1800 for the GM47r5 and
GSM 850/GSM1900 for the GM48r5.
•
the impedance of the antenna and antenna cable must be
50
Ω
.
•
the antenna output-power handling must be a minimum of
2W.
•
the VSWR value should be less than 3:1 to avoid damage to
the radio device.
7.3.3
Antenna Placement
The antenna should be placed away from electronic devices or
other antennas. The recommended minimum distance between
adjacent antennas, operating in a similar radio frequency band,
is at least 50cm.
If signal strength is weak, it is useful to face a directional
antenna at the closest radio base station. This can increase the
strength of the signal received by the radio device.
The radio device’s peak output power can reach 2W. RF field
strength varies with antenna type and distance. At 10cm from
the antenna the field strength may be up to 70V/m and at 1m it
will have reduced to 7V/m.
In general, CE-marked products for residential and commercial
areas, and light industry can withstand
a minimum of 3V/m.
7.3.4
The Antenna Cable
Use 50
Ω
impedance low-loss cable and high-quality
50
Ω
impedance connectors (frequency range up to 2GHz) to
avoid RF losses. Ensure that the antenna cable is as short as
possible.
The Voltage Standing-Wave Ratio (VSWR) may depend on the
effectiveness of the antenna, cable and connectors. In addition,
if you use an adapter between the antenna cable and the
antenna connector, it is crucial that the antenna cable is a high-
quality, low-loss cable.
Minimize the use of extension cables, connectors and adapters.
Each additional cable, connector or adapter causes a loss of
signal power.
7.3.5
Possible Communication Disturbances
Possible communication disturbances include the following:
•
Noise
can be caused by electronic devices and radio
transmitters.
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