Information On The Range - Conrad Electronic FS20 S4 Operating Instructions Manual

16. Information on the range

• The FS20 wireless control system, including the 'FS20S4' hand-held
transmitter, works in the 868 MHz range. This range is also used by
other devices and radio services.
This means that devices that operate on the same or neighbouring
frequency may restrict both the operation of the 'FS20S4' and its range.
• The specified range of up to 100m is the so-called free-field range. This
describes the range where there is direct visual contact between the
transmitter and the receiver.
In practice, however, walls, ceilings, etc. between the transmitter and
the receiver may affect and reduce the range.
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 insula-
tion glass windows, reinforced concrete ceilings and so on.
• 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
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