Integrator's Manual GR47/GR48

8. HINTS FOR INTEGRATING THE RADIO DEVICE

LZT 123 7589 R1A

In general, CE-marked products for residential and commercial areas, and

light industry can withstand a minimum of 3 V/m.

8.3.4 The Antenna Cable

Use 50 Ω impedance low-loss cable and high-quality 50 Ω impedance

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.

8.3.5 Possible Communication Disturbances

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.