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8.3.4 The Antenna Cable
8.3.5 Possible Communication Disturbances
LZT 123 7589 R1A
8. HINTS FOR INTEGRATING THE RADIO DEVICE
In general, CE-marked products for residential and commercial areas, and
light industry can withstand a minimum of 3 V/m.
Use 50
impedance low-loss cable and high-quality 50
connectors (frequency range up to 2 GHz) 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.
Possible communication disturbances include the following:
• Noise can be caused by electronic devices and radio transmitters.
• Path-loss occurs as the strength of the received signal steadily decreases
in proportion to the distance from the transmitter.
• Shadowing is a form of environmental attenuation of radio signals
caused by hills, buildings, trees or even vehicles. This can be a
particular problem inside buildings, especially if the walls are thick and
reinforced.
• Multi-path fading is a sudden decrease or increase in the signal
strength. This is the result of interference caused when direct and
reflected signals reach the antenna simultaneously. Surfaces such as
buildings, streets, vehicles, etc., can reflect signals.
• Hand-over occurs as you move from one cell to another in the GSM
network. Your mobile application call is transferred from one cell to the
next. Hand-over can briefly interfere with communication and may
cause a delay, or at worst, a disruption.
impedance
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