Range/Reception Problems - Conrad Electronic S555TH Notice D'emploi

9. Range/Reception Problems

The product works in the 868MHz range which is also used by other radio
services. This is why there may be a restrictive operation and range due
to devices that work on the same or a neighbouring frequency.
The specified range of up to 100m is the so called free field range, i.e. the
range within visible contact between the transmitter and receiver. But in
practice, walls, ceilings etc. between the transmitter and receiver may
affect and reduce the range.
If necessary, change the place of installation of the receiving station or
reduce the distance between receiver station and outdoor sensor.
However, reception problems can also occur if the distance between
outdoor sensor and receiving station is smaller than 1m.
Other causes for a reduced range:
• Any high-frequency interference
• Any kind of construction and vegetation
• Conductive metal parts which are located near the units or within or
near their transmission path, e.g. heaters, metallized insulation glass
windows, reinforced concrete ceilings etc.
• Influence on the radiation pattern of antennas caused by the distance
from the sender or the receiver to conductive surfaces or objects (to
human bodies or ground also)
• broadband disturbances in urban areas which reduce the signal noise
distance; the signal is no longer recognised in these "noises".
• Devices with neighboring operation frequencies e.g. audio radio
transmission devices
• Interference radiation resulting from insufficiently shielded electronics,
e.g. turned on computers or the like.
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