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13 Additional notes
to be taken into account
Ranges and interfences:
The wireless system used operates in the 868
MHz band, which is also used by other wireless
services. This means that devices operating on
the same or an adjacent frequency can lead to
restrictions in terms of operation and range.
The specified range of up to 100 m is the open
air range, i.e. the range when the transmitter and
the receiver can "see" each other. In practice,
however, there will be walls, ceilings, etc. between
the transmitter and receiver, which will reduce the
range accordingly.
Other reasons for a reduced range:
- All types of radio frequency interference
- Buildings of all types and vegetation
- Conductive components that could distort and
weaken the field are located in the vicinity of the
devices or on or near to the transmission path.
- The distance from the transmitter or receiver
to conductive surfaces or objects (or to floors
or human bodies) has an effect on the radiation
68
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