Conrad Electronic FAZ 3000-PIR-2, Руководство по эксплуатации

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16. Information on the range
Ranges and interference
• The components of the ‘FAZ 3000’ wireless alarm system work in the 868 MHz range, which
is also used by other radio services. Therefore devices that operate on the same or neighbour-
ing frequencies may restrict both its operation and its range.
• The specified range of up to 300m is the free-field range, which means the range with visual
contact between the transmitter and receiver. In practice, however, walls, ceilings, garages,
neighbouring buildings and so on between the transmitter and the receiver may affect and reduce
the range accordingly
.
Other causes of reduced ranges:
• All types of high-frequency interference
• Any buildings or vegetation
• Conductive metal parts that are located near the devices or within or near their transmission
path, for example, radiators, metallised insulation glass windows, reinforced concrete ceilings
and so on as well as metallised walls in prefabricated houses.
• Influence on the radiation pattern of antennas due to the distance from the transmitter or receiver
to conductive surfaces or objects (also to human bodies or the ground)
• Broadband interference in urban areas that reduces the signal-to-noise ratio; the signal is no
longer recognised due to this ‘noise’
• Interference radiation resulting from insufficiently shielded electronic devices, for example,
operating computers or similar

The actual attainable distance between the transmitter and the receiver in normal
operation therefore greatly depends on the installation location and the surroundings.
As a rule – when mounted in a family home, for example – all the components should
work properly and there should be no radio reception problems.