Range, Reception Problems - Conrad ASH888I Bedienungsanleitung

13. 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 300m 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.
In case of reception problems, turn the receiving station a little until the
data of the sensor are received again.
If necessary, change the place of installation of the receiving station or
reduce the distance between receiver station and indoor sensor.
However, reception problems can also occur if the distance between
indoor sensor and receiving station is smaller than 1m.
Other causes for reduced ranges:
• High frequency interferences of all sorts
• Any kind of construction and vegetation
• Conductive metal parts which are located near the devices or within or
near their transmission path, e.g. heaters, metallized insulation glass
windows, reinforced concrete ceilings etc.
• There is an influence on the radiation pattern of antennas due by the
distance from transmitter or receiver to conductive surfaces or objects
(to human bodies or ground also)
• Broadband interference in urban areas which reduces the signal-to-
noise-ratio; the signal will no longer be recognized due to this "noise".
• Devices with neighboring operation frequencies e.g. audio radio trans-
mission devices
• Interference radiation resulting from insufficiently shielded electronic
devices, e.g. turned-on computers or the like.
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