Ranges And Interference, Repeater - Conrad FHT 8W Bedienungsanleitung

9. Ranges and Interference, Repeater

• The FS20 system works in the 868 MHz range which is also used by other radio services. Therefore
restrictions in the operation and the range can occur through the devices which work on the same
or neighbouring frequency.
• The specified range of up to 100 m is the so-called free field range, i.e. the range within visible
contact between transmitter and receiver. In practical operation, however, there are walls, the
ceilings of rooms etc. between the transmitter and the receiver which reduce the range
correspondingly. A so-called repeater is available for range extension in the FS20 system.
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Do not position several receivers directly next to each other as they might influence
each other (minimum distance 0.2 m, we recommend 0.5 m or more).
Further causes of reduced range:
• high frequency disturbances of all types
• buildings of all types and vegetation
• conductive metals which are located in the proximity of the devices or within or close to the radio
route, e.g. radiators, metal insulation glass windows, reinforced concrete floors etc.
• influence aerial transmission function due to the proximity of the transmitter or receiver to
conductive areas or objects (also to the human body or floor).
• broadband disturbances in urban areas which reduce the signal noise distance; the signal is no
longer recognised in these "noise".
• interference from insufficiently shielded electronic devices, e.g. computers operated openly, or
similar.
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